Gmc Duramax 2013, Duramax 2013 User Manual

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Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

2013 Chevrolet/GMC DURAMAX Diesel M

In Brief . . . . . . . . . .. . . . . . . . . . .. . . 1-1

Initial Drive Information . . . . . . . .1-1

Performance and

Maintenance . . . . . . . . . . . . . . . . . 1-2

Instruments and Controls . . . . 5-1

Warning Lights, Gauges, and

Indicators . . . . . . . . . . . . . . . . . . . . 5-2

Information Displays . . . . . . . . . . .5-9

Vehicle Messages.. . . . . . . . . . . 5-10

Vehicle Personalization.. . . . . . 5-15

Driving and Operating . . . . . . . . 9-1

Starting and Operating . . . . . . . . .9-1

Diesel Particulate Filter . . . . . . . 9-10

Diesel Exhaust Fluid . . . . . . . . . 9-12

Vehicle Care .... . . . . . . . . . . . . . 10-1

Service and Maintenance . . . 11-1

Brakes . . . . . . . . . . . . . . . . . . . . . . . 9-18

Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 9-19

Towing . . . . . . . . . . . . . . . . . . . . . . . 9-38

Conversions and Add-Ons . . . 9-43

General Information . . . . . . . . . .10-1

Vehicle Checks.. . . . . . . . . . . . . . 10-3

Electrical System . . . . . . . . . . . . 10-27

General Information . . . . . . . . . . 11-1

Maintenance Schedule . . . . . . .11-3

Special Application

Services . . . . . . . . . . . . . . . . . . . . 11-8

Additional Maintenance

and Care . . . . . . . . .. . . . . . . . . . . 11-8

Recommended Fluids . . . . . . . 11-12

Maintenance Records . . . . . . . 11-16

Technical Data . . . . . . ......... 12-1

Vehicle Data. . . . . . . . . . . . . . . . . . 12-2

Index . . . . . . . . . . . . . . . . . . . . . i-1

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ii Introduction

The names, logos, emblems,
slogans, vehicle model names, and
vehicle body designs appearing in
this manual including, but not limited
to, GM, the GM logo, CHEVROLET,
GMC, the CHEVROLET and GMC
Truck Emblems, SILVERADO,
SIERRA, DENALI, EXPRESS,
SAVANA, and Duramax are
trademarks and/or service marks

This manual describes features that
may or may not be on your specific
vehicle either because they are
options that you did not purchase or
due to changes subsequent to the
printing of this owner manual.
Please refer to the purchase
documentation relating to your
specific vehicle to confirm each of

the features found on your vehicle.
of General Motors LLC, its
subsidiaries, affiliates, or licensors.

Litho in U.S.A.
Part No. 22974887 A First Printing

For vehicles first sold in Canada,
substitute the name “General
Motors of Canada Limited” for GMC
and Chevrolet Motor Division
wherever it appears in this manual.

This manual contains information
that pertains to the operation of your
diesel engine. It also contains your
Diesel Maintenance Schedule. The
sections in this manual correspond
to the sections in your owner
manual. This manual, along with
your owner manual, will assist you
in the proper use and maintenance
of your vehicle.

Keep this manual in the vehicle for
quick reference.

©

2012 General Motors LLC. All Rights Reserved.

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Introduction iii

Canadian Vehicle Owners

Propriétaires Canadiens

A French language copy of this
manual can be obtained from your
dealer or from:

On peut obtenir un exemplaire de
ce guide en français auprès du
concessionnaire ou à l'adresse
suivante:

Helm, Incorporated
Attention: Customer Service
47911 Halyard Drive
Plymouth, MI 48170

Using this Supplement

This supplement contains
information specific to the unique
components of the vehicle. It does
not explain everything you need to
know about the vehicle. Read this
supplement along with the owner
manual to learn about the vehicle's
features and controls.

Index

A good place to look for what you
need is the Index in back of this
supplement. It is an alphabetical list
of what is in the supplement, and
the page number where you will
find it.

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iv Introduction

2 NOTES

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In Brief 1-1

In Brief

Initial Drive Information

Transmission . . . . . . . . . . . . . . . . . . 1-1

Performance and Maintenance

Engine Oil Life System . . . . . . . . 1-2

Diesel Particulate Filter . . . . . . . 1-3

Diesel Exhaust Fluid . . . . . . . . . . 1-4

Initial Drive
Information

Transmission

Cold Operation

When temperatures are very cold,
the transmission will prevent certain
operations to protect against
damage. The information below
shows shift range availability based
on transmission oil temperature:

.

All shift ranges available at

−25°C (−13°F) or above.

.

2 (Second) and 3 (Third) shift
ranges only at −35°C (−31°F) to

−25°C (−13°F).

.

2 (Second) shift range only at

−35°C (−31°F) or lower.

Torque converter clutch operation
will also be prevented when air or
transmission oil temperatures are
below certain levels.

For areas where ambient
temperatures are below −40°C
(−40°F), use synthetic transmission
fluid approved to Allison
Transmission
TES-295. See Recommended

Fluids and Lubricants on page 11‑12
and Automatic Transmission Fluid
on page 10‑10.

Adaptive Shift Controls

The shift quality of a new vehicle
may not be ideal because the
Adaptive Shift Control process may
not have determined the best
settings for a particular shift or
condition. Shift quality will improve
with continued driving.

Low Traction Mode

Low Traction Mode aids in vehicle
acceleration on slippery road
surfaces such as ice or snow. By
selecting 2 (Second) using Range
Selection Mode while at a stop, the
transmission will limit torque to the
drive wheels to prevent slippage.

®

specification

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1-2 In Brief

Heater Performance Mode

When cold weather conditions are
detected, the transmission raises
part throttle upshift points after the
1 (First) to 2 (Second) upshift to
increase engine speed. This feature
shortens engine and cab warm up
times.

When the transmission is in this
mode, upshifts may be delayed.
This is normal and does not indicate
an operational problem.

Four Wheel Drive

When operating in 4
(Four-Wheel-Drive Low), there is a
very deep gear reduction. The
resulting shifts will feel exaggerated.

↓

Performance and

Maintenance

Engine Oil Life System

The engine oil life system calculates

engine oil life based on vehicle use

and, on most vehicles, displays a

DIC message when it is necessary

to change the engine oil and filter.

The oil life system should be reset

only following an oil change.

Resetting the Oil Life System

To reset the Engine Oil Life System

on van models:

1. Display the OIL LIFE

2. Press and hold the SET/RESET

REMAINING on the DIC.

button on the DIC for more than
five seconds. The oil life will
change to 100%.

To reset the Engine Oil Life System
on most pickup models:

1. Display the OIL LIFE
REMAINING on the DIC. If the
vehicle does not have DIC
buttons, the vehicle must be in
P (Park) to access this display.

2. Press and hold the SET/RESET
button on the DIC, or the trip
odometer reset stem if the
vehicle does not have DIC
buttons, for more than
five seconds. The oil life will
change to 100%.

On all models, the Engine Oil Life
System can be reset as follows:

1. Turn the ignition to ON/RUN with
the engine off.

2. Fully press the accelerator pedal
slowly three times within
five seconds.

3. Display the OIL LIFE
REMAINING on the DIC. If the
display shows 100%, the system
is reset.

4. Turn the key to LOCK/OFF.

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In Brief 1-3

See Engine Oil Life System on
page 10‑9.

Diesel Particulate Filter

The Duramax engine is equipped
with a Diesel Particulate Filter (DPF)
that, by design, will filter or trap
particulates. The DPF is located
under the vehicle in the exhaust
system.

Depending on a number of factors
monitored by the engine computer,
the DPF will need to be cleaned of
accumulated solids. When a
cleaning is needed, the engine
computer will initiate a cleaning
action by warming the exhaust gas
temperature. This feature has been
designed to operate automatically,
with limited operator involvement or
awareness.

Cleaning the DPF (Exhaust
Filter)

While the DPF cleaning is
automatically controlled by the
engine computer, the vehicle will
need to operate continuously for
approximately 30 minutes and at
speeds greater than 48 km/h
(30 mph) to clean the DPF
effectively. If the vehicle is returned
to idle during the cleaning process,
the driver may notice a slightly
different sound or a slightly elevated
engine idle speed. This is normal.
No action is required on the part of
the driver during a regular DPF
cleaning. See Diesel Particulate
Filter on page 9‑10.

Special DPF Driver Messages

If the vehicle is used for numerous
short trips or extended slow-speed
operation, the engine computer may
not be able to adequately heat up
the exhaust system to clean the
DPF effectively. The engine
computer has been designed to
continuously monitor the condition

of the DPF. When the engine
computer detects that the DPF is
nearly full of particulates and that
the vehicle is not being operated in
a manner that would allow effective
automatic DPF cleaning, the Driver
Information Center will display the
message CLEANING EXHAUST
FILTER KEEP DRIVING UNTIL
MESSAGE IS CLEARED.

If the vehicle continues to be driven
in a manner that prevents effective
DPF cleaning, the DPF will become
plugged with particulates. If this
occurs, the engine computer will
turn on the service engine soon light
in the instrument cluster and the
DIC will display the message
ENGINE POWER IS REDUCED.
See Diesel Particulate Filter on

page 9‑10 and Engine Power
Messages on page 5‑11.

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1-4 In Brief

Fuel

Use Ultra-Low Sulfur Diesel
Fuel (ULSD)

Use Ultra-Low Sulfur Diesel Fuel
(ULSD) only. The emission control
hardware used on the vehicle may
be damaged by using fuel with high
sulfur levels. Use only fuel that is
dispensed from pumps bearing the
ULSD label.

Do Not Use Low Sulfur Diesel
Fuel (LSD)

Do not use fuel that is dispensed
from pumps bearing the LSD label.

Do Not Use Non-Highway Fuel

Fuel labeled as off road or
non-highway is typically very high in
sulfur content and will damage the
emission control system.
Non-highway fuel is not intended for
use in on-highway vehicles and
does not have the fuel properties
needed by the DPF-equipped
Duramax Diesel.

In addition:

.

Use the correct engine oil.

.

Do not add gasoline to
diesel fuel.

.

Do not modify the induction or
exhaust systems.

See Fuel for Diesel Engines on

page 9‑19 and Engine Oil on
page 10‑6.

Diesel Exhaust Fluid

Diesel Exhaust Fluid (DEF) is used
with diesel engines to reduce the
amount of regulated emissions
produced. The DEF system must be
maintained for the vehicle to run
properly.

Locating Diesel Exhaust Fluid

DEF can be purchased at a
Chevrolet or GMC dealer. It can
also be purchased at authorized
vehicle and truck dealerships.
Additionally, some diesel truck
fueling stations or retailers may
have DEF for purchase. For

vehicles with an active OnStar

®

subscription, OnStar can help to
locate a DEF retailer. For more
information on locating DEF see
www.afdc.energy.gov/afdc/locator/
def/. See “Customer Assistance
Offices” in the owner manual for
phone numbers to assist you in
contacting a GM dealer. See

Recommended Fluids and
Lubricants on page 11‑12.

As the DEF tank becomes low on
fluid, warnings begin with
approximately 1600 km
(1,000 miles) of remaining range.
These warnings will increase in
intensity as the tank becomes
empty. Once the tank is empty, the
vehicle speed will be limited. If there
is an issue with the quality of the
fluid or the exhaust fluid system,
warnings will be displayed in the
Driver Information Center (DIC).
See Diesel Exhaust Fluid on
page 9‑12.

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Instruments and Controls 5-1

Instruments and Controls

Warning Lights, Gauges, and
Indicators

Instrument Cluster . . . . . . . . . . . . 5-2

Fuel Gauge . . . . . . . . . . . . . . . . .. . 5-4

Engine Oil Pressure Gauge . . . 5-5
Malfunction Indicator Lamp . . . 5-6

Wait-to-Start Light . . . . . . . . . .. . . 5-8

Diesel Exhaust Fluid (DEF)

Warning Light . . . . . . . . . . . . . . . . 5-8

Information Displays

Driver Information

Center (DIC) . . . . . . . .. . . . . . .. . 5-9

Vehicle Messages

Vehicle Messages . . . . . . . . . . . 5-10

Engine Cooling System

Messages . . . . . . . . . .. . . . . . .. 5-10

Engine Oil Messages . . . . . . . . 5-10

Engine Power Messages . . . . 5-11

Fuel System Messages . . . . . . 5-11

Diesel Exhaust Fluid

Messages . . . . . . . . . . . . . . . . . . 5-11

Diesel Particulate Filter

Messages . . . . . . . . . .. . . . . . .. 5-12

Service Vehicle Messages . . . 5-12
Starting the Vehicle

Messages . . . . . . . . . .. . . . . . .. 5-12

Transmission Messages . . . . . 5-13

Vehicle Speed Messages . . .. 5-13

Vehicle Personalization

Vehicle Personalization . . . . . . 5-15

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5-2 Instruments and Controls

Warning Lights, Gauges, and Indicators

Instrument Cluster

English Pickup Shown, Metric Similar

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Instruments and Controls 5-3

English Van Shown, Metric Similar

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5-4 Instruments and Controls

See the owner manual for warning
lights and gauges not listed in this
supplement.

Fuel Gauge

Metric Pickup Models

English Pickup Models

Metric Van Models

English Van Models

When the ignition is on, the fuel
gauge shows approximately how
much fuel the vehicle has left in the
tank. The gauge will first indicate
E (Empty) before the vehicle is out
of fuel, but the vehicle's fuel tank
should be filled soon.

An arrow on the fuel gauge
indicates the side of the vehicle the
fuel door is on.

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Instruments and Controls 5-5

Listed are four situations customers
may experience with the fuel gauge:

.

At the gas station, the fuel pump
shuts off before the gauge reads
F (Full).

.

It takes a little more or less fuel
to fill up than the fuel gauge
indicated. For example, the
gauge may have indicated the
tank was half full, but it actually
took a little more or less than
half the tank's capacity to fill
the tank.

.

The gauge moves a little while
turning a corner or speeding up.

.

The gauge does not go back to
E (Empty) when the ignition is
turned off.

None of these indicate a problem
with the fuel gauge.

For information on how to fill the fuel
tank, see Filling the Tank on
page 9‑36.

Engine Oil Pressure Gauge

English Pickup Models

Metric Pickup Models

Metric Van Models

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5-6 Instruments and Controls

English Van Models

Notice: Lack of proper engine oil
maintenance can damage the
engine. Driving with the engine
oil low can also damage the
engine. The repairs would not be
covered by the vehicle warranty.
Check the oil level as soon as
possible. Add oil if required, but
if the oil level is within the
operating range and the oil
pressure is still low, have the
vehicle serviced. Always follow
the maintenance schedule for
changing engine oil.

The engine oil pressure gauge
reads in kPa (kilopascals) or psi
(pounds per square inch) when the
engine is running. Oil pressure may
vary with engine speed, outside
temperature, and oil viscosity.

If readings are outside the normal
operating range, the low oil
pressure message may display on
the Driver Information Center (DIC),
or for vehicles without DIC the oil
pressure light will come on. If the oil
pressure is outside the normal
operating range of 0-548 kPa
(0-80 psi), check the oil level
immediately. DO NOT operate the
engine with the oil pressure warning
light on or an ENGINE OIL LOW
ADD OIL message displayed.

Malfunction Indicator Lamp

A computer system called OBD II
(On-Board Diagnostics-Second
Generation) monitors the operation
of the vehicle to ensure emissions
are at acceptable levels, helping to
maintain a clean environment. The
malfunction indicator lamp comes
on when the vehicle is placed in
ON/RUN as a check to show it is
working. If it does not, have the
vehicle serviced by your dealer. See
“Ignition Positions” in the owner
manual.

If the malfunction indicator lamp
comes on while the engine is
running, this indicates that there is
an OBD II problem and diagnosis
and service might be required.

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Instruments and Controls 5-7

This light may also come on when
the Diesel Exhaust Fluid (DEF)
management system is not working.
See Diesel Exhaust Fluid on
page 9‑12.

Malfunctions often are indicated by
the system before any problem is
apparent. Being aware of the light
can prevent more serious damage
to the vehicle. This system also
assists the service technician in
correctly diagnosing any
malfunction.

Notice: If the vehicle is
continually driven with this light
on, the emission controls might
not work as well, the vehicle fuel
economy might not be as good,
and the engine might not run as
smoothly. This could lead to
costly repairs that might not be
covered by the vehicle warranty.

Notice: Modifications made to the
engine, transmission, exhaust,
intake, or fuel system of the
vehicle or the replacement of the
original tires with other than

those of the same Tire
Performance Criteria (TPC) can
affect the vehicle's emission
controls and can cause this light
to come on. Modifications to
these systems could lead to
costly repairs not covered by the
vehicle warranty. This could also
result in a failure to pass a
required Emission Inspection/
Maintenance test. See

Accessories and Modifications on
page 10‑1.

When the light is on, an emission
control system malfunction has
been detected on the vehicle.
Diagnosis and service might be
required.

An emission system malfunction
might be corrected by using good
quality fuel. Poor fuel quality causes
the engine not to run as efficiently
as designed and may cause: stalling
after start-up, stalling when the
vehicle is changed into gear,
misfiring, hesitation on acceleration,
or stumbling on acceleration. These

conditions might go away once the
engine is warmed up. See Fuel for
Diesel Engines on page 9‑19.

If this does not make the light turn
off, your dealer can check the
vehicle. The dealer has the proper
test equipment and diagnostic tools
to fix any mechanical or electrical
problems that might have
developed.

Emissions Inspection and
Maintenance Programs

Depending on where you live, your
vehicle may be required to
participate in an emission control
system inspection and maintenance
program. For the inspection, the
emission system test equipment will
likely connect to the vehicle's Data
Link Connector (DLC).

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5-8 Instruments and Controls

The DLC is under the instrument
panel to the left of the steering
wheel. See your dealer if assistance
is needed.

The vehicle may not pass
inspection if:

.

The malfunction indicator lamp is
on with the engine running, or if
the light does not come on when
the ignition is turned to ON/RUN
while the engine is off. See your
dealer for assistance in verifying
proper operation of the
malfunction indicator lamp.

.

The OBD II (On-Board
Diagnostics) system determines
that critical emission control
systems have not been
completely diagnosed. The
vehicle would be considered not
ready for inspection. This can

Wait-to-Start Light

If the wait-to-start light comes on,
the glow plug system is required
and operating. Wait until the light
turns off before starting the engine.
This light may not come on in warm
temperatures.

happen if the 12-volt battery has
recently been replaced or run
down. The diagnostic system is
designed to evaluate critical
emission control systems during
normal driving. This can take
several days of routine driving.
If this has been done and the
vehicle still does not pass the
inspection for lack of OBD II
system readiness, your dealer
can prepare the vehicle for
inspection.

The fast warm-up glow plug system
makes the wait-to-start light stay on
for a shorter amount of time than
most diesel engines.

See Starting the Diesel Engine on
page 9‑1.

Diesel Exhaust Fluid (DEF) Warning Light

This light, a Driver Information
Center (DIC) Message, and a chime
come on when there is an issue with
the Diesel Exhaust Fluid.

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Instruments and Controls 5-9

See Diesel Exhaust Fluid Messages
on page 5‑11 for information on the

specific message displaying with the
light.

If the DEF fluid level has not been
corrected, the light will continue to
flash when the vehicle is started.
The vehicle's speed may also be
limited.

Also see Diesel Exhaust Fluid on
page 9‑12.

Information Displays

Driver Information Center (DIC)

The Driver Information Center (DIC)
is located on the instrument panel
above the steering wheel. The DIC
comes on when the ignition is on.

A Duramax Diesel vehicle may have
the following additional DIC menu
items.

EXHAUST FLUID LEVEL

If the vehicle has DIC buttons, press
the vehicle information button until
EXHAUST FLUID LEVEL displays.
If the vehicle does not have DIC
buttons, press the trip stem until
EXHAUST FLUID LEVEL displays.
The EXHAUST FLUID LEVEL will
be displayed as either OK, XX%,
or LOW.

When LOW appears on the display,
you should add diesel exhaust fluid
as soon as you can. See Diesel
Exhaust Fluid on page 9‑12.

FUEL FILTER LIFE REMAINING

If the vehicle has DIC buttons, press
the vehicle information button until
FUEL FILTER LIFE REMAINING
displays. If the vehicle does not
have DIC buttons, press the trip
stem until FUEL FILTER LIFE
REMAINING displays. This display
shows an estimate of the fuel filter's
remaining useful life. If you see
90% FUEL FILTER LIFE
REMAINING on the display, it
means 90% of the current fuel filter
life remains. The fuel filter life
system will alert you to change the
fuel filter on a schedule consistent
with your driving conditions.

When the remaining fuel filter life is
low, the CHANGE FUEL FILTER
message will appear on the display.
You should change the fuel filter as
soon as you can.

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5-10 Instruments and Controls

FUEL FILTER LIFE RESET

You must reset the FUEL FILTER
LIFE REMAINING display after each
fuel filter change. It will not reset
itself. Also, be careful not to reset
the FUEL FILTER LIFE REMAINING
display at any time other than when
the fuel filter has just been changed
because it cannot be reset
accurately until the next fuel filter
change. The fuel filter life will
change to 100% when the system
has been reset. To reset the system,
press and hold the set/reset button,
or the trip stem if there are no DIC
buttons, for two seconds while
FUEL FILTER LIFE REMAINING is
displayed on the DIC.

Vehicle Messages

The Driver Information Center (DIC)
will display warning messages if a
problem is detected. Pressing the
select button or the set/reset button
for vehicles with DIC buttons, or the
trip odometer reset stem for vehicles
without DIC buttons, will
acknowledge some current warning
or service messages. Other
messages are more urgent and
cannot be cleared from the display
until the issue is corrected.

The following are some additional
messages that the Duramax Diesel
vehicle can display.

Engine Cooling System Messages

COOLANT LEVEL LOW ADD
COOLANT

Notice: Engine damage from
running your engine without
coolant is not covered by your
warranty. See “Overheated

Engine Protection Operating
Mode” in the owner manual for
information on driving to a safe
place in an emergency.

This message will appear on the
DIC if the engine coolant level is
low. Adding coolant to the coolant
recovery tank will clear the
message. For Pickups only,
remember to check the coolant in
both sides of the reservoir. See
“Engine Coolant” in the owner
manual.

Engine Oil Messages

ENGINE OIL LOW ADD OIL

This message only displays when
the ignition key is turned to ON/RUN
and the oil level in the vehicle is low.
Check the oil level and correct it as
necessary. You may need to let the
vehicle cool or warm up and cycle
the ignition to be sure this message
clears.

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Instruments and Controls 5-11

This message clears itself after
10 seconds, until the next ignition
cycle. See Engine Oil on page 10‑6.

Engine Power Messages

ENGINE POWER IS REDUCED

A computer monitors the operation
of the engine. If the ENGINE
POWER IS REDUCED message
comes on while driving, there will be
a reduction in performance and
acceleration. You should take the
vehicle in for service.

Fuel System Messages

CHANGE FUEL FILTER

This message will appear on the
DIC for 10 seconds when a fuel filter
change is required. See Fuel Filter
Replacement on page 9‑33.

WATER IN FUEL SERVICE
REQUIRED

This message will come on to warn
you if there is water in the diesel
fuel system. For more information
on how this message works, see
Water in Fuel on page 9‑27.

Diesel Exhaust Fluid Messages

For more information on these
messages, see “Exhaust Fluid Low”
or “Exhaust Fluid Quality Poor” in
Diesel Exhaust Fluid on page 9‑12.

EXHAUST FLUID RANGE:
XXXX KM (MI)

When the exhaust fluid is getting
low, the range will be displayed in
either kilometers or miles. It is
normal for the EXHAUST FLUID
RANGE to vary based on vehicle
and environmental driving
conditions. When this message first
displays at approximately 1 600 km

(1,000 mi) of fluid range remaining,
the fluid is approximately 11 L
(3 gal) low.

EXHAUST FLUID LOW SPEED
LIMITED SOON

When the exhaust fluid range is less
than 120 km (75 mi) this message
will be displayed.

EXHAUST FLUID EMPTY
REFILL NOW

This message will be displayed
when the exhaust fluid is empty.
This message may be accompanied
by other messages that provide
more information.

EXHAUST FLUID QUALITY
POOR SEE OWNERS
MANUAL NOW

This message displays when the
exhaust fluid is of poor quality or the
wrong fluid was added. This
message may be accompanied by
other messages that provide more
information.

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5-12 Instruments and Controls

Diesel Particulate Filter Messages

CLEANING EXHAUST FILTER
KEEP DRIVING UNTIL
MESSAGE IS CLEARED

This message will appear on the
DIC when an exhaust particulate
filter cleaning is required. To clean
the filter, drive the vehicle above
50 km/h (30 mph) until the warning
message goes off. This will take
about 30 minutes.

If the filter is not cleaned, the
malfunction indicator lamp will come
on and the ENGINE POWER IS
REDUCED message will be
displayed. Vehicle performance will
be limited. See Diesel Particulate
Filter on page 9‑10.

Service Vehicle Messages

SERVICE EXHAUST FLUID
SYSTEM SEE OWNERS
MANUAL NOW

This message displays when the
exhaust fluid system needs service.
This message may be accompanied
by other messages that provide
more information. See “Service
Exhaust Fluid System” in Diesel
Exhaust Fluid on page 9‑12.

SERVICE EMISSION SYSTEM
SEE OWNERS MANUAL NOW

This message displays when the
emission system needs service.
Take the vehicle to your dealer. See

“Service Emission System” in Diesel
Exhaust Fluid on page 9‑12.

Starting the Vehicle Messages

ELEVATED IDLE OFF

If your vehicle does not have DIC
buttons, this message will appear
when the elevated idle/exhaust
restrictor feature has been turned
off. This feature can be turned on or
off by pressing the pedals. For more
information on the elevated idle/
exhaust restrictor feature, see

“Elevated Idle” under Starting the
Diesel Engine on page 9‑1.

If your vehicle has DIC buttons, this
message will not be displayed. The
elevated idle can be turned on or off
using the customization menus.
Press the customization button until
ELEVATED IDLE appears on the
DIC display. Press the set/reset
button once to access the settings
for this feature. Then press the
customization button to scroll
through the following settings: OFF,
ON, or NO CHANGE. Choose one

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Instruments and Controls 5-13

of the available settings and press
the set/reset button while it is
displayed on the DIC to select it.

ELEVATED IDLE ON

If your vehicle does not have DIC
buttons, this message will appear
when the elevated idle/exhaust
restrictor feature has been turned
on. This feature can be turned on or
off by pressing the pedals. For more
information on the elevated idle/
exhaust restrictor feature, see

“Elevated Idle” under Starting the
Diesel Engine on page 9‑1.

If your vehicle has DIC buttons, this
message will not be displayed. The
elevated idle can be turned on or off
using the customization menus.
Press the customization button until
ELEVATED IDLE appears on the
DIC display. Press the set/reset
button once to access the settings
for this feature. Then press the
customization button to scroll
through the following settings: OFF,
ON, or NO CHANGE. Choose one

of the available settings and press
the set/reset button while it is
displayed on the DIC to select it.

FAST IDLE ON

If your vehicle has this feature, this
message displays when the fast idle
feature is on. See “Fast Idle Control”
under Starting the Diesel Engine on
page 9‑1.

Transmission Messages

SHIFT INHIBITED SELECT N
TO RESET (Pickup Models)

If the transmission is unable to shift
into a selected gear, this message
will appear on the DIC. The
electronic shift position indicator on
the instrument panel cluster may
blink when this occurs. To make the
vehicle shift to the requested gear,
you may have to shift back to
P (Park) or N (Neutral) and re-select
the desired gear.

Vehicle Speed Messages

For more information on these
messages, see Diesel Exhaust Fluid
on page 9‑12.

XXX KM (MI) UNTIL 105 KM/H
(65 MPH) MAX SPEED

This message will be displayed
along with other messages. These
messages include EXHAUST FLUID
EMPTY REFILL NOW, EXHAUST
FLUID QUALITY POOR, SERVICE
EMISSION SYSTEM, or SERVICE
EXHAUST FLUID SYSTEM. The
vehicle speed will be limited to
105 km/h (65 mph) when the
countdown is over.

XXX KM (MI) UNTIL 88 KM/H
(55 MPH) MAX SPEED

This message will be displayed
along with other messages. These
messages include EXHAUST FLUID
EMPTY REFILL NOW, EXHAUST
FLUID QUALITY POOR, SERVICE
EMISSION SYSTEM, or SERVICE
EXHAUST FLUID SYSTEM.

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5-14 Instruments and Controls

The vehicle speed will be limited to
88 km/h (55 mph) when the
countdown is over.

XXX KM (MI) UNTIL 7 KM/H
(4 MPH) MAX SPEED

This message will be displayed
along with other messages. These
messages include EXHAUST FLUID
EMPTY REFILL NOW, EXHAUST
FLUID QUALITY POOR,
or SERVICE EXHAUST FLUID
SYSTEM. The vehicle speed will be
limited to 7 km/h (4 mph) when the
countdown is over.

SPEED LIMITED TO 105 KM/H
(65 MPH)

This message will be displayed
along with other messages. These
messages include EXHAUST FLUID
EMPTY REFILL NOW, EXHAUST
FLUID QUALITY POOR, SERVICE
EMISSION SYSTEM, or SERVICE
EXHAUST FLUID SYSTEM. When
this message is displayed, the
vehicle speed is being limited to
105 km/h (65 mph).

SPEED LIMITED TO 88 KM/H
(55 MPH)

This message will be displayed
along with other messages. These
messages include EXHAUST FLUID
EMPTY REFILL NOW, EXHAUST
FLUID QUALITY POOR, SERVICE
EMISSION SYSTEM, or SERVICE
EXHAUST FLUID SYSTEM. When
this message is displayed, the
vehicle speed is being limited to
88 km/h (55 mph).

SPEED LIMITED TO
7 KM/H (4 MPH)

This message will be displayed
along with other messages. These
messages include EXHAUST FLUID
EMPTY REFILL NOW, EXHAUST
FLUID QUALITY POOR,
or SERVICE EXHAUST FLUID
SYSTEM. When this message is
displayed, the vehicle speed is
being limited to 7 km/h (4 mph).

TRANSITIONING TO XX KM/H
(XX MPH) MAX SPEED

This message will be displayed
along with other messages. These
messages include EXHAUST FLUID
EMPTY REFILL NOW, EXHAUST
FLUID QUALITY POOR, SERVICE
EMISSION SYSTEM, or SERVICE
EXHAUST FLUID SYSTEM. When
this message is displayed, the end
of the countdown has been reached
and the vehicle speed is being
limited.

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Instruments and Controls 5-15

Vehicle Personalization

Your Duramax Diesel vehicle may
have additional customizable
features for Power Take-Off (PTO).
See Power Take-Off (PTO) on
page 9‑43. These features may
need to be enabled by your dealer.

Entering the Feature
Settings Menu

1. Turn the ignition to ON/RUN
without the engine running and
place the vehicle in P (Park).

To avoid excessive drain on the
battery, it is recommended that
the headlamps are turned off.

2. Press the customization button
to scroll through the available
customizable options.

Feature Settings Menu Items

PTO STANDBY SPEED

This feature allows you to select the
PTO standby speed.

Press the customization button until
the PTO STANDBY SPEED screen
appears on the DIC display. Press
the set/reset button once to access
the settings for this feature. Then
press the customization button to
scroll through the following choices:

.

800 RPM

.

900 RPM

.

1000 RPM

.

1100 RPM

.

1200 RPM

.

1300 RPM

.

1400 RPM

.

1500 RPM

.

NO CHANGE

To select a setting, press the set/
reset button while the desired
setting is displayed on the DIC.

PTO SET 1 SPEED

This feature, available if the vehicle
is configured for Stationary Preset
PTO, allows you to select the PTO 1
set speed.

Press the customization button until
the PTO SET 1 SPEED screen
appears on the DIC display. Press
the set/reset button once to access
the settings for this feature. Then
press the customization button to
scroll through the following choices:

.

1000 RPM

.

1200 RPM

.

1400 RPM

.

1600 RPM

.

1800 RPM

.

2000 RPM

.

2200 RPM

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5-16 Instruments and Controls

.

2400 RPM

.

NO CHANGE

To select a setting, press the set/
reset button while the desired
setting is displayed on the DIC.

PTO SET 2 SPEED

This feature, available if the vehicle
is configured for Stationary Preset
PTO, allows you to select the PTO 2
set speed.

Press the customization button until
the PTO SET 2 SPEED screen
appears on the DIC display. Press
the set/reset button once to access
the settings for this feature. Then
press the customization button to
scroll through the following choices:

.

1800 RPM

.

2000 RPM

.

2200 RPM

.

2400 RPM

.

2600 RPM

.

2800 RPM

.

3000 RPM

.

.

To select a setting, press the set/
reset button while the desired
setting is displayed on the DIC.

PTO TAP STEP

This feature, available if the vehicle
is configured for Stationary Variable
or Mobile PTO, allows you to select
the PTO tap step.

Press the customization button until
the PTO TAP STEP screen appears
on the DIC display. Press the set/
reset button once to access the
settings for this feature. Then press
the customization button to scroll
through the following choices:

.

.

.

.

.

.

.

3200 RPM

NO CHANGE

25 RPM

75 RPM

100 RPM

150 RPM

200 RPM

250 RPM

350 RPM

.

NO CHANGE

To select a setting, press the set/
reset button while the desired
setting is displayed on the DIC.

PTO SHUTDOWN TIME

This feature, available if the vehicle
is configured for Stationary Preset
or Stationary Variable PTO, allows
you to select the PTO
shutdown time.

Press the customization button until
the PTO SHUTDOWN TIME screen
appears on the DIC display. Press
the set/reset button once to access
the settings for this feature. Then
press the customization button to
scroll through the following choices:

.

OFF

.

20 MINUTES

.

35 MINUTES

.

50 MINUTES

.

65 MINUTES

.

80 MINUTES

.

95 MINUTES

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.

110 MINUTES

.

NO CHANGE

To select a setting, press the set/
reset button while the desired
setting is displayed on the DIC.

Instruments and Controls 5-17

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5-18 Instruments and Controls

2 NOTES

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Driving and Operating 9-1

Driving and Operating

Brakes

Fuel

Starting and Operating

Starting the Diesel Engine . . . . 9-1

Winter Cover . . . . .. . . . . . . . .. . . . 9-4

Engine Heater . . . . . . . .. . . . . . . . . 9-9

Fuel Operated

Heater (FOH) . . . . . . . . . . . . . . . 9-10

Parking over Things

That Burn . . . . . . . . . . . . . . . . . . 9-10

Diesel Particulate Filter

Diesel Particulate Filter . . .. . . 9-10

Diesel Exhaust Fluid

Diesel Exhaust Fluid . . . . . . . . . 9-12

Towing

Conversions and Add-Ons

Exhaust Brake . . . . . . . . . .. . . . . 9-18

Fuel for Diesel Engines . . . . . . 9-19

What Fuel to Use in

The U.S. . . . . . . . . . . . . . . . . . . . 9-20

What Fuel to Use in Canada

and Mexico . . . . . . . . . .. . . . . . . 9-24

Cold Weather Operation . . . . . 9-27

Water in Fuel . . . . . . . . . . . . . . . . 9-27

Running Out of Fuel . . . . . . . . . 9-32

Fuel Filter Replacement . . . . . 9-33

Filling the Tank . . . . . . . . . . . . . . 9-36

Filling a Portable Fuel

Container . . . . . . . .. . . . . . . . . . . 9-38

Trailer Towing . . . . . . . . . . . . . . . . 9-38

Power Take-Off (PTO) . . . . . . . 9-43

Starting and
Operating

Starting the Diesel Engine

The diesel engine starts differently
than a gasoline engine. The vehicle
will only start in the P (Park) or the
N (Neutral) position.

Move the shift lever to P (Park) or
N (Neutral). To restart the engine
when the vehicle is already moving,
use N (Neutral) only.

Notice: Do not try to shift to
P (Park) if the vehicle is moving.
If you do, you could damage the
transmission. Shift to P (Park)
only when the vehicle is stopped.

Starting the Engine

1. Turn the ignition key to ON/RUN.

Observe the wait-to-start light.
See Wait-to-Start Light on
page 5‑8. This light may not
come on if the engine is warm.

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9-2 Driving and Operating

2. As soon as the wait-to-start light
goes off, immediately turn the
ignition key to START. When the
engine starts, let go of the key.

The engine has a fast warm-up
glow plug system. The
wait-to-start light will illuminate
for a much shorter time than
most diesel engines, due to the
rapid heating of the glow plug
system.

Notice: If the wait‐to‐start light
stays on after starting the vehicle,
the vehicle may not run properly.
Have the vehicle serviced
right away.

3. If the engine does not start after
15 seconds of cranking, turn the
ignition switch to LOCK/OFF.
Wait one minute for the starter to
cool, then try the same steps
again.

If you are trying to start the engine
after you have run out of fuel, follow
the steps in Running Out of Fuel on
page 9‑32.

When the engine is cold, let it run
for a few minutes before you move
the vehicle. This lets oil pressure
build up. The engine will sound
louder when it is cold.

Cold Weather Starting (Diesel
Engine)

The following tips will help with cold
weather starting.

Use the recommended engine oil
when the outside temperature drops
below freezing. See Engine Oil on
page 10‑6. When the outside
temperature drops below –18°C
(0°F), use of the engine coolant
heater is recommended.

If you experience longer cranking
times, notice an unusual amount of
exhaust smoke, or are at higher
elevations (over 2 135 m or 7,000 ft),
you may use the engine coolant
heater. See Engine Heater on
page 9‑9.

See Fuel for Diesel Engines on
page 9‑19 for information on what
fuel to use in cold weather.

If the Diesel Engine Will Not
Start

If you have run out of fuel, see
Running Out of Fuel on page 9‑32.

If the vehicle is not out of fuel, and
the engine will not start, turn the
ignition key to ON/RUN.
Immediately after the wait-to-start
light goes off, turn the ignition key to
START.

If the light does not go off, wait a
few seconds, then try starting the
engine again. See your dealer as
soon as you can for a starting
system check.

If the light comes on and then goes
off and you know the batteries are
charged, but the engine still will not
start, the vehicle needs service.

If the light does not come on when
the engine is cold, the vehicle
needs service.

If the batteries do not have enough
charge to start the engine, see
“Battery” in the owner manual.

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Driving and Operating 9-3

Be sure you have the right oil for the
engine, and that you have changed
the oil at the proper times. If you
use the wrong oil, the engine may
be harder to start.

Be sure you are using the proper
fuel for existing weather conditions.
See Fuel for Diesel Engines on
page 9‑19.

If the engine starts, runs a short
time, then stops, the vehicle needs
service.

WARNING

{

Do not use gasoline or starting
aids, such as ether, in the air
intake. They could damage the
engine, which may not be
covered by the warranty. There
could also be a fire, which could
cause serious personal injury.

Engine Idle Variations

Under certain conditions the engine
idle speed can vary or be elevated.
Change in idle speed is normal and
does not indicate a problem. Normal
conditions that can raise idle speed
are low voltage, DPF regeneration,
air conditioning compressor loads,
and engine warmup. These speeds
can range from approximately 600
to 1,000 rpm.

Elevated Idle

The engine has a cold temperature
high idle feature which elevates the
engine idle speed from base idle to
1050 rpm for pickup models or
1200 rpm for van models when
outside temperatures are below 0°C
(32°F), and the engine coolant
temperature is below 65°C (150°F).
This feature enhances heater
performance by raising the engine
coolant temperature faster.

This feature can be turned on or off
using the DIC buttons. If the vehicle
is not equipped with DIC buttons, do
the following to turn this feature on
or off:

1. Turn the ignition to ON/RUN,
with the vehicle off.

2. Press the accelerator pedal to
the floor and hold while quickly
pressing the brake pedal three
times in less than eight seconds.

3. Release the accelerator pedal
and start the engine.

When the engine is started, it will
slowly ramp up to the high idle
speed after a delay of a few
seconds up to approximately
two minutes. For this method to
work properly there must be no
throttle or brake pedal faults.

The engine idle speed will return to
normal once the following conditions
are met:

.

Engine coolant temperature
reaches 65°C (150°F).

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9-4 Driving and Operating

.

Air intake temperature reaches
0°C (32°F).

The high idle speed will be
temporarily interrupted and the
engine speed will return to normal if
any of the following conditions

Fast Idle control will be enabled
when the following conditions
are met:

.

.

occur:

.

The brake pedal is applied.

.

The accelerator pedal is
pressed.

.

The transmission is shifted out
of P (Park) or N (Neutral).

.

Vehicle speed is detected.

.

.

.

Once these inputs are removed, the
engine idle speed will slowly ramp
back up to high idle after the normal
delay, if the conditions for engine
coolant temperature and air intake
temperature are still met.

Fast Idle Control

Fast Idle control will be disabled
when one or more of the following
conditions occur:

.

.

The vehicle may have this system
which can be used to increase the
engine idle speed.

.

The parking brake is set.

The transmission is in P (Park)
or N (Neutral).

The vehicle speed is about
0 km/h (0 mph).

The cruise control is in the On
position. See “Cruise Control” in
the owner manual.

The cruise control Set switch is
pressed and released for Preset
Fast Idle Speed (1200 rpm).

The cruise control is in the Off
position.

The cruise control Set switch is
pressed and released. See
“Cruise Control” in the owner
manual.

The cruise control Cancel switch
is pressed.

.

The brake pedal is pressed.

.

The transmission is shifted out
of P (Park) or N (Neutral).

.

The parking brake is released.

.

The vehicle speed is not
0 km/h (0 mph).

When Fast Idle is active, a FAST
IDLE ON message will be displayed
in the Driver Information Center
(DIC). See Starting the Vehicle
Messages on page 5‑12.

Winter Cover

If the vehicle includes a winter
cover, it can be used to enhance
heater performance in extremely
cold conditions below −18°C (0°F).
The winter cover installs over the
grille and restricts airflow to the
engine compartment.

For diesel powered vehicles that did
not come with a winter cover, a GM
winter cover can be purchased as
an accessory. See your dealer for
additional information.

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Driving and Operating 9-5

Usage Guidelines

The winter cover should only be
used while operating the vehicle in
extremely cold temperatures or in
heavy snow for extended periods of
time. In these temperatures, the
vehicle does not need a large
amount of air to properly cool the
engine. When more airflow is
required to cool the vehicle, the
winter cover should not be used.
The following usage guidelines will
allow adequate airflow for proper
radiator and air cooler performance:

.

Do not use the winter cover if
towing a trailer. The added
power needed to tow a trailer
requires the radiator grille to
have full airflow under all
conditions. The vehicle may
overheat if the cover is used
while towing a trailer.

.

Do not use the winter cover if a
snow plow is mounted on the
truck. The addition of a snow
plow requires the radiator grille
to have full airflow.

.

Do not cover the opening in the
front bumper. This opening is to
provide enough airflow.

.

Do not modify the cover. The
winter cover does not cover
some sections of the front of the
vehicle because these openings
are needed to provide enough
airflow to the radiator grille and
air cooler in extremely cold
temperatures.

.

When the winter cover is used,
the temperature sensor found on
the inside rearview mirror will not

function properly. The
temperature that is shown will be
incorrect.

.

Keep the underside of the winter
cover as clean as possible at all
times. Remove monthly or as
necessary and clean away dust
and debris.

.

Use only a mild soap to clean
the winter cover. Do not use
harsh soap, strong detergents,
or vinyl protectant/sealant type
products as they may destroy
the special finish of the winter
cover. Allow the winter cover to
dry completely before reinstalling
on the vehicle.

Installation Instructions

When first trying to fit the cover, it
may appear to be undersized. This
is due to the nature of the special
vinyl, which will stretch during
installation to ensure a tight fit. For
this reason, the initial installation of
the cover is best performed when
the winter cover is warm.

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9-6 Driving and Operating

Installation (Chevrolet Pickup)

1. Open the hood.

2. Slide the channels of the cover
down the back edge of the grille
on both sides.

3. Hook J-clips to the bottom of the
grille.

4. Hook J-clips to the top edge of
the grille by the engine
compartment.

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5. Hook J-clips to the side edge of
the grille.

6. To remove the winter cover,
reverse the steps listed
previously.

Installation (GMC Pickup)

1. Open the hood.

2. Slide the channels of the cover
down the back edge of the grille
on both sides.

Driving and Operating 9-7

3. Insert pockets between the grille
and the bumper.

4. Hook J-clips to the top edge of
the grille by the engine
compartment.

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9-8 Driving and Operating

5. To remove the winter cover,
reverse the steps listed
previously.

Installation (Van Models)

1. Open the hood and secure it
with the prop rod.

2. Hook the five J-clips to the
bottom edge of the grille.

3. Hook the top center J-clip by the
hood latch.

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Driving and Operating 9-9

4. Attach the metal hooks, one
each at the top corners.

5. To remove the winter cover,
reverse the steps listed
previously.

Engine Heater

The engine coolant heater can
provide easier starting and better
fuel economy during engine
warm-up in cold weather conditions
at or below −18°C (0°F). The engine
coolant heater should be plugged in
at least four hours before starting.

To Use the Engine Heater

1. Turn off the engine.

2. Open the hood and unwrap the
electrical cord. The cord is
located in the engine
compartment, on the passenger
side of the vehicle, near the right
side auxiliary battery.

3. Plug it into a normal, grounded
110-volt AC outlet.

WARNING

{

Plugging the cord into an
ungrounded outlet could cause an
electrical shock. Also, the wrong
kind of extension cord could
overheat and cause a fire. You
could be seriously injured. Plug
the cord into a properly grounded
three-prong 110-volt AC outlet.
If the cord will not reach, use a
heavy-duty three-prong extension
cord rated for at least 15 amps.

4. Before starting the engine, be
sure to unplug and store the
cord as it was before to keep it
away from moving engine parts,
and prevent damage.

The length of time the heater should
remain plugged in depends on the
outside temperature. You may wish
to use the coolant heater to improve
ease of starting at temperatures
between −18°C (0°F) and −29°C
(−20°F). Keep the coolant heater
plugged in for a minimum of four
hours. At temperatures below −29°C
(−20°F), the coolant heater should
remain plugged in for at least eight
hours. It will not harm either the
coolant heater or the vehicle to
leave the coolant heater plugged in
longer than the times stated. Be
sure to store the cord before starting
the engine. See Fuel for Diesel
Engines on page 9‑19 for
information on what fuel to use in
cold weather.

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9-10 Driving and Operating

Fuel Operated Heater (FOH)

If the vehicle includes an FOH, it will
enhance heater performance and
will reduce the amount of time it
takes to warm the inside of the
vehicle in cold conditions below or
equal to 4°C (39°F). The FOH is
installed on the frame rail on the
driver side of the vehicle and uses
diesel fuel to heat the engine
coolant, which warms up the
passenger cabin air.

The FOH will turn on if all of the
following conditions exist:

.

Outside air temperature is below
or equal to 4°C (39°F).

.

Fuel level is greater or equal to

12.5% of the total fuel tank
volume.

.

The engine is running.

.

Coolant temperature is less than
75°C (167°F).

Parking over Things That Burn

WARNING

{

Things that can burn could touch
hot exhaust parts under the
vehicle and ignite. Do not park
over papers, leaves, dry grass,
or other things that can burn.

Diesel Particulate Filter

The vehicle has a Diesel Particulate
Filter (DPF) as part of the exhaust
system to reduce vehicle emissions.
The DPF requires a unique exhaust
tailpipe with an exhaust cooler. The
exhaust cooler mixes air with the
exhaust to lower the temperature
before it leaves the tailpipe.

The DPF, the tailpipe, or other
exhaust system components must
not be altered. Inspect regularly and
clean any mud or dirt from the
exhaust cooler, especially where the
exhaust cooler connects to the
tailpipe and the openings where
fresh air enters the cooler. See
“Exhaust System Inspection” under

Maintenance Schedule on
page 11‑3.

The DPF will clean itself as part of
normal operation. Several factors
including fuel consumed, hours of
engine operation and miles driven
are monitored by the Engine Control

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Driving and Operating 9-11

Module (ECM). The self-cleaning
occurs approximately once per tank
of fuel.

Notice: Permanent damage can
occur to the DPF or related
components if the required Ultra
Low Sulfur Diesel (15 ppm sulfur
maximum) or low ash CJ‐4 engine
oil is not used. This damage
would not be covered by the
vehicle warranty.

Under certain driving conditions,
such as stop-and-go traffic, the filter
cannot clean itself. The CLEANING
EXHAUST FILTER KEEP DRIVING
UNTIL MESSAGE IS CLEARED
message comes on when the DPF
is dirty and needs to perform a self
cleaning.

For the filter to clean itself, the
vehicle must be driven above
50 km/h (30 mph) until the
CLEANING EXHAUST FILTER
KEEP DRIVING UNTIL MESSAGE
IS CLEARED message goes off.
This will take about 30 minutes.

WARNING

{

During DPF self cleaning or
during extended idling in P (Park),
the exhaust system and exhaust
gases are very hot. Things that
burn could touch hot exhaust
parts under the vehicle and ignite.
You or others could be burned.
Do not park, or idle for an
extended period of time, near or
over papers, leaves, dry grass,
or other things that can burn.
Keep the exhaust area clear of
material that could ignite or burn.
See Parking over Things That
Burn on page 9‑10 for more
information.

Notice: Extended idle should be
avoided because the DPF system
is not capable of self cleaning at
idle. During extended idle
operation, monitor the instrument

panel telltale lights and Driver
Information Center for messages
and take appropriate indicated
action. Continued idling with the
warning light/message on could
cause irreversible damage to the
DPF requiring repair and possible
replacement that might not be
covered by the vehicle warranty.

You will also notice a change in the
exhaust sound and engine idle
speed. This is normal. See Vehicle
Messages on page 5‑10.

If you continue to drive with the DPF
warning message on and the
exhaust filter is not cleaned as
required, the malfunction indicator
lamp and the ENGINE POWER IS
REDUCED message will come on
and dealer service is necessary.
See Malfunction Indicator Lamp on

page 5‑6 and Engine Power
Messages on page 5‑11.

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9-12 Driving and Operating

Vehicles with DPF have specific fuel
and engine oil requirements. See

What Fuel to Use in The U.S. on
page 9‑20 or What Fuel to Use in
Canada and Mexico on page 9‑24

and Engine Oil on page 10‑6 for
more information on those
requirements.

Extended idling in P (Park) can
cause exhaust parts and gases to
become very hot. Keep the exhaust
area clear of material that could
ignite or burn. See Parking over
Things That Burn on page 9‑10.

For vehicles with Power Take-Off
(PTO), monitor the instrument panel
cluster for lights related to the DPF.

See Accessories and Modifications
on page 10‑1 for important
information if you are considering
adding accessories or modifying the
vehicle.

Diesel Exhaust Fluid

WARNING

{

Diesel Exhaust Fluid (DEF) is
corrosive. Do not allow it to come
in contact with your skin, eyes,
or the finished surfaces of the
vehicle. If exposed, it may cause
skin and eye irritation. Wear skin
and eye protection when
handling. Inhalation may cause
irritation to the upper respiratory
tract. Store in a cool, well‐
ventilated area. For more safety
information, see the label of the
Diesel Exhaust Fluid container.

DEF is used with diesel engines to
reduce the amount of regulated
emissions produced. The fluid level
in the DEF tank must be maintained
for the vehicle to run correctly. The
capacity of the DEF tank is 20.1 L
(5.3 gal).

Locating Diesel Exhaust Fluid

DEF can be purchased at a
Chevrolet or GMC dealer. It can
also be purchased at authorized
vehicle and truck dealerships.
Additionally, some diesel truck
fueling stations or retailers may
have DEF for purchase. For
vehicles with an active OnStar
subscription, OnStar can help to
locate a DEF retailer. For more
information on locating DEF see
www.afdc.energy.gov/afdc/vehicles/
diesels_fluid.html. See “Customer
Assistance Offices” in the owner
manual for phone numbers to assist
in contacting a GM dealer. See

Recommended Fluids and
Lubricants on page 11‑12.

Filling the DEF Tank

Notice: Use only exhaust fluid
that is GM approved, or fluid
containing the API certified or
ISO 22241 label. The use of other
fluids could damage the system,

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requiring costly repairs that will
not be covered by the vehicle
warranty.

When adding DEF to an empty or
very low tank, always add at least

7.6 L (2 gal) of fluid to release the
vehicle from speed limitation.

Do not overfill the DEF tank. When
fluid reaches the top of the fill pipe,
stop filling. Do not top off the DEF
tank. When the EXHAUST FLUID
RANGE XXXX message in the
Driver Information Center (DIC)
displays at approximately 1600 km
(1,000 mi) of fluid range remaining,
about 11 L (3 gal) of DEF have
been used.

If you spill DEF on the vehicle while
filling the tank, rinse the area with
water and wipe the surface with a
damp cloth.

For vans, the DEF fill is located
behind the fuel fill door. The DEF
cap is blue, and the diesel cap is
green.

The fill tube location for chassis-cab
and cutaway vans finished by an
upfitter will vary. Check the upfitter
manual.

DEF Fill - Vans

Driving and Operating 9-13

DEF Fill - Pickups

For full-size pickups, the DEF fill is
located under the hood, on the
passenger side, at the back of the
engine compartment. The DEF cap
is blue.

Exhaust Fluid Low

A full DEF tank will last for several
thousand kilometers (miles),
depending on vehicle usage. As the
exhaust fluid level drops, warnings
will automatically be displayed in the
DIC. Exhaust fluid level status is
available on the DIC under the
vehicle Information button.

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9-14 Driving and Operating

See “Exhaust Fluid Level” in Driver
Information Center (DIC) on
page 5‑9.

To avoid vehicle speed limitations,
the DEF tank should be refilled at
the first opportunity after a low
warning indication. If DEF is added
before the EXHAUST FLUID
EMPTY REFILL NOW message
appears, it may take several km/mi
for the DIC message to update.

If the vehicle speed has been
limited and DEF has been added, it
may take up to 30 seconds after
engine start with the vehicle
stopped for the EXHAUST FLUID
EMPTY REFILL NOW message to
clear. If the vehicle is driven prior to
the DIC message clearing, the
vehicle speed will still be limited.
If the DIC message clears while
driving, the speed limitation will be
removed gradually.

If DEF is added under freezing
conditions, additional time may be
required to remove speed limitations
and may require less fluid to fill the
DEF tank.

The following actions describe
strategies required by the U.S.
Environmental Protection Agency
(EPA) and the California Air
Resource Board (CARB). The DEF
messages relate to these strategies.

The DIC message EXHAUST
FLUID RANGE: XXXX km (mi)
displays at approximately 1600 km
(1,000 mi) of fluid range remaining.
This message appears again at
approximately 500 km (300 mi) of
remaining range before the exhaust
fluid tank becomes empty.

Below 500 km (300 mi) of range
remaining, these messages will
appear every time the vehicle is
started.

If these warnings are ignored and
the DEF tank becomes empty, the
DIC message EXHAUST FLUID
EMPTY REFILL NOW - 644 KM
(400 MI) UNTIL 105 KM/H (65 MPH)
MAX SPEED displays. The
displayed mileage will decrease as
driving continues. A warning light
also comes on.

When the mileage countdown
is zero, the DIC message
EXHAUST FLUID EMPTY REFILL
NOW - TRANSITIONING TO
105 KM/H (65 MPH) MAX SPEED
displays. A warning light and a
chime also come on. Vehicle speed
will be reduced to a maximum
speed limit of 105 km/h (65 mph).

After the transition to 105 km/h
(65 mph) is complete, the DIC
message EXHAUST FLUID EMPTY
REFILL NOW - SPEED LIMITED
TO 105 KM/H (65 MPH) – 120 KM
(75 MI) UNTIL 89 KM/H (55 MPH)
MAX SPEED displays. The
displayed mileage will decrease as
driving continues. A warning light
and a chime also come on.

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Driving and Operating 9-15

When the mileage countdown
is zero, the DIC message
EXHAUST FLUID EMPTY REFILL
NOW - TRANSITIONING TO
89 KM/H (55 MPH) MAX SPEED
displays. A flashing warning light
and a chime also come on. Vehicle
speed will be reduced to a
maximum speed limit of 89 km/h
(55 mph).

After the transition to 89 km/h
(55 mph) is complete, the DIC
message EXHAUST FLUID EMPTY
REFILL NOW - SPEED LIMITED
TO 89 KM/H (55 MPH) – 120 KM
(75 MI) UNTIL 7 KM/H (4 MPH) MAX
SPEED displays. The displayed
mileage will decrease as driving
continues. A flashing warning light
and a chime also come on.

When the mileage countdown
is zero, the DIC message
EXHAUST FLUID EMPTY REFILL
NOW - TRANSITIONING TO
7 KM/H (4 MPH) MAX SPEED
displays. A flashing warning light

and a chime also come on. Vehicle
speed will be reduced to a
maximum speed limit of
7 km/h (4 mph).

After the transition to 7 km/h (4 mph)
is complete, the DIC message
EXHAUST FLUID EMPTY REFILL
NOW - SPEED LIMITED TO 7 KM/H
(4 MPH) displays. A flashing
warning light and a chime also
come on.

Add at least 7.6 L (2 gal) of fluid to
release the vehicle from speed
limitation from a very low or empty
tank. The capacity of the DEF tank
is 20.1 L (5.3 gal).

See Diesel Exhaust Fluid Messages

on page 5‑11, Diesel Exhaust Fluid
(DEF) Warning Light on page 5‑8,
and Recommended Fluids and
Lubricants on page 11‑12.

Exhaust Fluid Quality Poor

Use only exhaust fluid that is GM
approved, or fluid containing the API
certified or ISO 22241 label.

All DEF has an expiration date.
If the system detects poor quality,
or contaminated or diluted DEF, the
DIC message EXHAUST FLUID
QUALITY POOR - SEE OWNERS
MANUAL NOW – 160 KM (99 MI)
UNTIL 105 KM/H (65 MPH) MAX
SPEED displays. The displayed
mileage will decrease as driving
continues. A warning light also
comes on. Adding fresh DEF to the
system may resolve the problem,
depending on several factors. If the
DIC message persists, see your
dealer or additional DIC messages
may display.

When the mileage countdown is
zero, a DIC message EXHAUST
FLUID QUALITY POOR - SEE
OWNERS MANUAL NOW ­TRANSITIONING TO 105 KM/H
(65 MPH) MAX SPEED displays.
A warning light and a chime also
come on. Vehicle speed will be
reduced to a maximum speed limit
of 105 km/h (65 mph).

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9-16 Driving and Operating

After the transition to 105 km/h
(65 mph) is complete, the DIC
message EXHAUST FLUID
QUALITY POOR - SEE OWNERS
MANUAL NOW - SPEED LIMITED
TO 105 KM/H (65 MPH) – 120 KM
(75 MI) UNTIL 89 KM/H (55 MPH)
MAX SPEED displays. The
displayed mileage will decrease as
driving continues. A warning light
and a chime also come on.

When the mileage countdown is
zero, the DIC message EXHAUST
FLUID QUALITY POOR - SEE
OWNERS MANUAL NOW ­TRANSITIONING TO 89 KM/H
(55 MPH) MAX SPEED displays.
A flashing warning light and a chime
also come on. Vehicle speed will be
reduced to a maximum speed limit
of 89 km/h (55 mph).

After the transition to 89 km/h
(55 mph) is complete, a DIC
message EXHAUST FLUID
QUALITY POOR - SEE OWNERS
MANUAL NOW - SPEED LIMITED
TO 89 KM/H (55 MPH) – 120 KM
(75 MI) UNTIL 7 KM/H (4 MPH) MAX

SPEED displays. The displayed
mileage will decrease as driving
continues. A flashing warning light
and a chime also come on.

When the mileage countdown is
zero, a DIC message EXHAUST
FLUID QUALITY POOR - SEE
OWNERS MANUAL NOW ­TRANSITIONING TO 7 KM/H
(4 MPH) MAX SPEED displays.
A flashing warning light and a chime
also come on. Vehicle speed will be
reduced to a maximum speed limit
of 7 km/h (4 mph).

After the transition to 7 km/h (4 mph)
is complete, a DIC message
EXHAUST FLUID QUALITY POOR

- SEE OWNERS MANUAL NOW ­SPEED LIMITED TO 7 KM/H
(4 MPH) displays. A flashing
warning light and a chime also
come on.

Service Exhaust Fluid System

If a problem occurs with the DEF
system, the DIC message SE
RVICE EXHAUST FLUID SYSTEM

- SEE OWNERS MANUAL NOW –

160 KM (99 MI) UNTIL 105 KM/H
(65 MPH) MAX SPEED displays.
The displayed mileage will decrease
as driving continues. A warning light
also comes on. In some cases this
message will clear itself, indicating
that the DEF system was able to
correct the condition. If the DIC
message persists, see your dealer
or additional DIC messages may
display.

When the mileage countdown is
zero, the DIC message SERVICE
EXHAUST FLUID SYSTEM - SEE
OWNERS MANUAL NOW ­TRANSITIONING TO 105 KM/H
(65 MPH) MAX SPEED displays.
A warning light and a chime also
come on. Vehicle speed will be
reduced to a maximum speed limit
of 105 km/h (65 mph).

After the transition to 105 km/h
(65 mph) is complete, a DIC
message SERVICE EXHAUST
FLUID SYSTEM - SEE OWNERS
MANUAL NOW - SPEED LIMITED
TO 105 KM/H (65 MPH) – 120 KM
(75 MI) UNTIL 89 KM/H (55 MPH)

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Driving and Operating 9-17

MAX SPEED displays. The
displayed mileage will decrease as
driving continues. A warning light
and a chime also come on.

When the mileage countdown is
zero, the DIC message SERVICE
EXHAUST FLUID SYSTEM - SEE
OWNERS MANUAL NOW ­TRANSITIONING TO 89 KM/H
(55 MPH) MAX SPEED displays.
A flashing warning light and a chime
also come on. Vehicle speed will be
reduced down to a maximum speed
limit of 89 km/h (55 mph).

After the transition to 89 km/h
(55 mph) is complete, the DIC
message SERVICE EXHAUST
FLUID SYSTEM - SEE OWNERS
MANUAL NOW - SPEED LIMITED
TO 89 KM/H (55 MPH) – 120 KM
(75 MI) UNTIL 7 KM/H (4 MPH) MAX
SPEED displays. The displayed
mileage will decrease as driving
continues. A flashing warning light
and a chime also come on.

When the mileage countdown is
zero, the DIC message SERVICE
EXHAUST FLUID SYSTEM - SEE
OWNERS MANUAL NOW ­TRANSITIONING TO 7 KM/H
(4 MPH) MAX SPEED displays.
A flashing warning light and a chime
also come on. Vehicle speed will be
reduced to a maximum speed limit
of 7 km/h (4 mph).

After the transition to 7 km/h (4 mph)
is complete, the DIC message
SERVICE EXHAUST FLUID
SYSTEM - SEE OWNERS
MANUAL NOW - SPEED LIMITED
TO 7 KM/H (4 MPH) displays.
A flashing warning light and a chime
also come on.

Service Emission System

If a problem occurs with the vehicle
emission system, the DIC message
SERVICE EMISSION SYSTEM ­SEE OWNERS MANUAL NOW –
282 KM (175 MI) UNTIL 105 KM/H
(65 MPH) MAX SPEED displays.
The displayed mileage will decrease
as driving continues. In some cases

this message will clear itself,
indicating that the emission system
was able to correct the condition.
If the DIC message persists, see
your dealer or additional DIC
messages may display.

When the mileage countdown is
zero, the DIC message SERVICE
EMISSION SYSTEM - SEE
OWNERS MANUAL NOW ­TRANSITIONING TO 105 KM/H
(65 MPH) MAX SPEED displays.
A chime also comes on. Vehicle
speed will be reduced to a
maximum speed limit of 105 km/h
(65 mph).

After the transition to 105 km/h
(65 mph) is complete, the DIC
message SERVICE EMISSION
SYSTEM - SEE OWNERS
MANUAL NOW - SPEED LIMITED
TO 105 KM/H (65 MPH) – 120 KM
(75 MI) UNTIL 89 KM/H (55 MPH)
MAX SPEED displays. The
displayed mileage will decrease as
driving continues. A chime also
comes on.

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9-18 Driving and Operating

When the mileage countdown is
zero, the DIC message SERVICE
EMISSION SYSTEM - SEE
OWNERS MANUAL NOW ­TRANSITIONING TO 89 KM/H
(55 MPH) MAX SPEED displays.
A chime also comes on. Vehicle
speed will be reduced to a
maximum speed limit of 89 km/h
(55 mph).

After the transition to 89 km/h
(55 mph) is complete, the DIC
message SERVICE EMISSION
SYSTEM - SEE OWNERS
MANUAL NOW - SPEED LIMITED
TO 89 KM/H (55 MPH) displays.
A chime also comes on.

Brakes

Exhaust Brake

The heavy duty diesel pickups have
an exhaust brake to enhance the
vehicle brake system, and reduce
brake lining wear. A switch is used
to activate the system, and is
located below the climate controls in
the center of the vehicle instrument
panel. The switch must be pressed
at each vehicle start for the system
to be active. A light in the switch will
come on when the exhaust brake is
activated.

The Driver Information Center (DIC)
displays the message EXHAUST
BRAKE ENABLED for
approximately 10 seconds, then
clears.

To turn the brake off, press the
exhaust brake switch a second time.
The DIC displays the message
EXHAUST BRAKE DISABLED for
approximately 10 seconds, then
clears.

Downshifts may be automatically
selected to increase engine speed,
which increases the effectiveness of
the exhaust brake. The number of
downshifts selected is determined
by the length of time the brakes are
applied, and the rate the vehicle is
slowing. The system delivers the
correct amount of braking to assist
in vehicle control. The heavier the
vehicle load, the more active the
engine exhaust brake will be. Use of
the exhaust brake will help maintain
vehicle speed when used with
cruise control. See “Cruise Control”
in the owner manual.

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Automatic downshifts will not occur
if the vehicle is in Range Selection
Mode. See “Manual Mode” in the
owner manual.

The exhaust brake only activates
when the transmission torque
converter is locked. This can vary
based on vehicle speed, gear, and
load. The exhaust brake will be
more active when in Tow/
Haul Mode.

Fuel

Fuel for Diesel Engines

Some states and provinces have
restrictions on the purchase of
diesel fuel for light-duty vehicles and
require you to buy permits or pay
special taxes. Some of these
restrictions apply only to residents,
and others apply to both residents
and visitors. These restrictions can
change. To learn the current
restrictions in any state or province,
contact your auto club, the police,
or other officials.

Notice: Diesel fuel or fuel
additives not recommended in
this manual could damage the
fuel system, fuel‐operated heater
(FOH) (Van models only), and
engine. Your warranty would not
cover this damage. And:

.

Diesel fuel that has been
mixed with engine oil or
automatic transmission fluid
could damage the engine
and emission controls.

Driving and Operating 9-19

.

We do not test aftermarket
diesel fuel additives. Some
additives, particularly those
which contain alcohol or
water emulsifiers, could
damage the fuel system.
If you believe that unique
circumstances call for a fuel
additive to be used, consult
your dealer for advice.

.

If you ever run out of diesel
fuel, it can be difficult to
restart the engine. To avoid
this, never let the tank get
empty.

If gasoline is ever accidentally
added to the fuel tank, to avoid
severe engine damage, do not
run the engine until the fuel tank
can be drained.

Some conditions, such as dirty fuel,
may decrease fuel filter life and a
change filter message may
come on.

If you run out of fuel, Running Out of
Fuel on page 9‑32 tells you how to
restart the engine.

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9-20 Driving and Operating

What Fuel to Use in The U.S.

Notice: Use of diesel fuel other
than Ultra Low Sulfur Diesel
(15 ppm sulfur maximum) will
cause permanent damage to the
exhaust after‐treatment system.
This damage would not be
covered by the vehicle warranty.

The emission control system
requires the use of diesel fuel with
ultra low sulfur content (15 ppm or

0.0015% by weight, maximum).
Look for the following label on the
dispenser to ensure you are filling
with Ultra Low Sulfur Diesel fuel.

At a minimum, the diesel fuel you
use should meet the latest version
of ASTM specification D 975
(Grades No. 2-D or No. 1-D S15,
commonly known as Ultra Low
Sulfur Diesel) in the United States.
If there are questions about the fuel
you are using, contact your fuel
supplier.

Diesel Fuel Grades

For best results use No. 2-D diesel
fuel year-round (above and below
freezing conditions) as oil
companies blend No. 2-D fuel to
address climate differences.

No. 1-D diesel fuel can be used in
very cold temperatures (when it
stays below −18°C or 0°F);
however, it will produce a power and
fuel economy loss. Avoid the use of
No. 1-D diesel fuel in warm or hot
climates. It can result in stalling,
poor starting when the engine is hot,
and damage to the fuel injection
system.

Premium Diesel Fuel

Diesel fuel corresponding to the
Engine Manufacturers Association
(EMA) Recommended Guideline on
Premium Diesel Fuel (FQP-1A)
could provide better starting, less
noise, and better vehicle
performance, but its use is not
required.

Biodiesel

What is biodiesel?

Biodiesel is a fuel produced from
vegetable oils or animal fats that
have been chemically modified to
reduce the possibility of damage to
the fuel system and engine.

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Driving and Operating 9-21

Notice: Raw vegetable oil or
other unmodified bio-oils or fats
are not biodiesel and must not be
used in your vehicle as they
could damage the fuel system
and engine.

What not to use

Do not use home-made biodiesel in
your vehicle since its quality cannot
be verified by approved scientific
methods. Home test kits are not
approved scientific methods.

Notice: Any damage caused by
raw, unmodified, or home-made
biodiesel would not be covered
by the vehicle warranty.

Biodiesel blends

It is acceptable to use diesel fuel
containing up to 20% biodiesel
(B20). The diesel fuel portion of the
blend must meet the same
specification, ASTM D975 (Grades
No. 2-D or No. 1-D S15 commonly
known as Ultra Low Sulfur Diesel),
as other fuels used in your vehicle,
and the biodiesel used for making

this fuel must meet the latest
version of ASTM specification
D6751.

.

Pump labeling — Retail pumps
dispensing blends containing up
to 5% biodiesel (B5) are not
required to be labeled with the
concentration of biodiesel.
Blends up to B5 must meet
ASTM D975 (Grades No. 2-D or
No. 1-D S15 commonly known
as Ultra Low Sulfur Diesel).

Notice: Do not use blends
containing more than 20%
biodiesel. Any engine, fuel
system, or exhaust
after-treatment system damage
caused by the use of such blends
would not be covered by the
vehicle warranty.

Pumps dispensing more than
5% and up to 20% biodiesel are
required to be labeled with the
concentration of biodiesel. When
refueling with a biodiesel blend

above B5, ensure one of the
following two labels appears on
the dispenser:

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9-22 Driving and Operating

.

Biodiesel quality — Blends
containing more than 5% and up
to 20% biodiesel must meet the
latest version of ASTM
specification D7467 (Biodiesel
blend, B6 - B20). Biodiesel is an
emerging product, and its quality
can vary widely. To reduce the
risk of poor quality fuel, we
recommend that biodiesel
users purchase biodiesel blends
from a BQ-9000 certified
marketer. A listing of certified
marketers can be found at
www.bq-9000.org. If there
are questions about the
biodiesel-containing fuels you
are using, contact your fuel
supplier.

Notice: Certain driving patterns
are not compatible with biodiesel
use. It is the operator ’s
responsibility to ensure that
biodiesel in the vehicle’s tank
does not lead to engine, fuel
system, or exhaust after‐
treatment system damage.

We neither encourage nor
discourage the use of biodiesel
blends for vehicles. As a renewable
fuel, biodiesel provides some
environmental benefits. However,
biodiesel has unique properties and
needs to be handled differently than
diesel fuel. Its use presents
additional risks and may not be
appropriate in all situations. Certain
vehicle operating modes increase
these risks and should be avoided.
Read further to determine if your
driving habits are compatible with
the use of biodiesel.

.

Biodiesel fuel quality degrades
with time and exposure to high
temperature much more quickly
than conventional diesel fuel.
More frequent refueling provides
the best opportunity to have a
supply of fresh fuel.

Owners who have very low fuel
usage or who have vehicles
stored for extended periods of
time should avoid the use of
biodiesel. Storage at hot ambient
temperatures will accelerate
biodiesel degradation.

When vehicles will be stored for
extended periods of time
(greater than one month), they
should be run out of biodiesel to
below one-quarter tank, refueled
with conventional Ultra Low
Sulfur Diesel fuel, and driven
several miles before storage.

.

Biodiesel gels sooner than
conventional diesel fuel at cold
temperature, and biodiesel fuel
requires proper blending for
winter time operation.

Black plate (23,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

Driving and Operating 9-23

Fuels improperly blended for
cold temperature operation may
result in restricted fuel filters and
degraded vehicle performance.
Your vehicle is equipped with a
fuel heating system to provide a
level of protection against filter
plugging from gelling (waxing) of
conventional diesel fuel and
biodiesel blends. However, the
system will not prevent all cases
of plugged filters if the operating
temperature is far below the
temperature at which gelling or
waxing of the fuel occurs (cloud
point).

Use of biodiesel blends greater
than B5 (5% blend) should be
avoided in cold temperatures.

.

Vehicles operated for extended
periods of time on conventional
diesel fuel and then switched to
biodiesel blends may experience
premature fuel filter clogging and
require more frequent fuel filter
service.

With long-term use of
conventional diesel fuel, gum
and varnish may be deposited
within the tank and fuel system.
These deposits, while not
problematic with the use of
conventional diesel fuel, may
become loosened with a sudden
switch to biodiesel blends and
cause fuel filter plugging.

This vehicle is equipped with a
fuel filter restriction monitoring
system that will alert you if the
fuel filter requires service, but it
will not prevent damage caused
by poor quality biodiesel.

.

Use of biodiesel blends will
degrade the performance of your
vehicle’s water separator.
Biodiesel reduces the
effectiveness of the vehicle’s
water separator, and in the event
of water contamination of the
fuel, increases the risk of
damage to the fuel system.

Refueling

Diesel fuel can foam when you fill
the tank. This can cause the
automatic pump nozzle to shut off,
even though the tank is not full.
If this happens, wait for the foaming
to stop, and then try filling the tank
more slowly. See Filling the Tank on
page 9‑36.

WARNING

{

Heat coming from the engine can
cause the fuel to expand and
force the fuel out of the tank.
If something ignites the fuel, a fire
could start and people could be
burned. To help avoid this, try
filling the tank more slowly and fill
the fuel tank only until the
automatic nozzle shuts off. Do not
try to top it off.

Black plate (24,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

9-24 Driving and Operating

Accidental Refueling with
Gasoline

Notice: If any amount of gasoline
is added to the fuel tank, do not
start the engine until the fuel tank
can be drained and refilled with
Ultra Low Sulfur Diesel fuel. Your
dealer can perform this
procedure. If this procedure is
not performed, the vehicle will
run very rough and have reduced
power. Severe engine damage will
occur and would not be covered
by the vehicle warranty.

What Fuel to Use in Canada and Mexico

The emission control system
requires the use of diesel fuel with
ultra low sulfur content (15 ppm or

0.0015% by weight, maximum).

What Fuel to Use in Canada

Notice: Use of diesel fuel other
than Ultra Low Sulfur Diesel
(15 ppm sulfur maximum) will
cause permanent damage to the

exhaust after‐treatment system.
This damage would not be
covered by the vehicle warranty.

At a minimum, the diesel fuel you
use should meet the latest version
of specification CAN/CGSB-3.517
(ULS) in Canada. If there are
questions about the fuel you are
using, contact your fuel supplier.

Diesel Fuel Types

Canadian fuels are blended for
seasonal changes. Diesel Type “A”
fuel is blended for better cold
weather starting in extreme
conditions; however, you might
notice some power and fuel
economy loss. If Type “A” fuel is
used in warmer temperatures,
stalling and hard starting may occur.
Diesel Type “B” fuel is blended for
higher temperatures experienced
during most of the year.

Premium Diesel Fuel

Diesel fuels corresponding to the
Engine Manufacturers Association
(EMA) Recommended Guideline on
Premium Diesel Fuel (FQP-1A)
could provide better starting, less
noise, and better vehicle
performance, but their use is not
required.

Biodiesel

What is biodiesel?

Biodiesel is a fuel produced from
vegetable oils or animal fats that
have been chemically modified to
reduce the possibility of damage to
the fuel system and engine.

Notice: Raw vegetable oil or
other unmodified bio-oils or fats
are not biodiesel and must not be
used in your vehicle as they
could damage the fuel system
and engine.

Black plate (25,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

Driving and Operating 9-25

What not to use

Do not use home-made biodiesel in
your vehicle since its quality cannot
be verified by approved scientific
methods. Home test kits are not
approved scientific methods.

Notice: Any damage caused by
raw, unmodified, or home-made
biodiesel would not be covered
by the vehicle warranty.

Biodiesel blends

It is acceptable to use diesel fuel
containing up to 20% biodiesel
(B20). For low level, under 5%,
biodiesel blends (B1 to B5), the fuel
you use should meet the latest
version of specification CAN/
CGSB-3.520 (ULS). At the time of
printing of this manual, a CGSB
standard for B6-B20 is under
development and has not been
published. Until a CGSB B6-B20
specification is available, biodiesel
blends containing more than 5%
and up to 20% biodiesel must meet

the latest version of ASTM
specification D7467 (Biodiesel
blend, B6-B20). If there are
questions about the
biodiesel-containing fuels you are
using, contact your fuel supplier.

Notice: Certain driving patterns
are not compatible with biodiesel
use. It is the operator ’s
responsibility to ensure that
biodiesel in the vehicle’s tank
does not lead to engine, fuel
system, or exhaust after‐
treatment system damage.

We neither encourage nor
discourage the use of biodiesel
blends for vehicles. As a renewable
fuel, biodiesel provides some
environmental benefits. However,
biodiesel has unique properties and
needs to be handled differently than
diesel fuel. Its use presents
additional risks and may not be
appropriate in all situations. Certain
vehicle operating modes increase
these risks and should be avoided.

Read further to determine if your
driving habits are compatible with
the use of biodiesel.

.

Biodiesel fuel quality degrades
with time and exposure to high
temperature much more quickly
than conventional diesel fuel.
More frequent refueling provides
the best opportunity to have a
supply of fresh fuel.

Owners who have very low fuel
usage or who have vehicles
stored for extended periods of
time should avoid the use of
biodiesel. Storage at hot ambient
temperatures will accelerate
biodiesel degradation.

When vehicles will be stored for
extended periods of time
(greater than one month), they
should be run out of biodiesel to
below one-quarter tank, refueled
with conventional Ultra Low
Sulfur Diesel fuel, and driven
several miles before storage.

Black plate (26,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

9-26 Driving and Operating

.

Biodiesel gels sooner than
conventional diesel fuel at cold
temperature, and biodiesel fuel
requires proper blending for
winter time operation.

Fuels improperly blended for
cold temperature operation may
result in restricted fuel filters and
degraded vehicle performance.
Your vehicle is equipped with a
fuel heating system to provide a
level of protection against filter
plugging from gelling (waxing) of
conventional diesel fuel and
biodiesel blends. However, the
system will not prevent all cases
of plugged filters if the operating
temperature is far below the
temperature at which gelling or
waxing of the fuel occurs (cloud
point).

Use of biodiesel blends greater
than B5 (5% blend) should be
avoided in cold temperatures.

.

Vehicles operated for extended
periods of time on conventional
diesel fuel and then switched to
biodiesel blends may experience
premature fuel filter clogging and
require more frequent fuel filter
service.

With long-term use of
conventional diesel fuel, gum
and varnish may be deposited
within the tank and fuel system.
These deposits, while not
problematic with the use of
conventional diesel fuel, may
become loosened with a sudden
switch to biodiesel blends and
cause fuel filter plugging.

This vehicle is equipped with a
fuel filter restriction monitoring
system that will alert you if the
fuel filter requires service, but it
will not prevent damage caused
by poor quality biodiesel.

.

Use of biodiesel blends will
degrade the performance of your
vehicle’s water separator.

Biodiesel reduces the
effectiveness of the vehicle’s
water separator, and in the event
of water contamination of the
fuel, increases the risk of
damage to the fuel system.

What Fuel to Use in Mexico

Notice: Use of diesel fuel other
than Ultra Low Sulfur Diesel (15
ppm sulfur maximum) will cause
permanent damage to the exhaust
after‐treatment system. This
damage would not be covered by
the vehicle warranty.

Ultra Low Sulfur Diesel fuel is not
available in all regions of Mexico.

Refueling

Diesel fuel can foam when you fill
the tank. This can cause the
automatic pump nozzle to shut off,
even though the tank is not full.
If this happens, wait for the foaming
to stop, and then try filling the tank
more slowly. See Filling the Tank on
page 9‑36.

Black plate (27,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

Driving and Operating 9-27

WARNING

{

Heat coming from the engine can
cause the fuel to expand and
force the fuel out of the tank.
If something ignites the fuel, a fire
could start and people could be
burned. To help avoid this, try
filling the tank more slowly and fill
the fuel tank only until the
automatic nozzle shuts off. Do not
try to top it off.

Accidental Refueling with
Gasoline

Notice: If any amount of gasoline
is added to the fuel tank, do not
start the engine until the fuel tank
can be drained and refilled with
Ultra Low Sulfur Diesel fuel. Your
dealer can perform this
procedure. If this procedure is
not performed, the vehicle will
run very rough and have reduced
power. Severe engine damage will
occur and would not be covered
by the vehicle warranty.

Cold Weather Operation

Follow the instructions listed
previously under the heading “What
Fuel to Use.”

Notice: Never use home heating
oil or gasoline in the vehicle.
They can cause engine damage
not covered by the vehicle
warranty.

In cold weather, the fuel filter could
become clogged by wax naturally
present in the fuel. To unclog it,
move the vehicle to a warm garage
area and allow the filter to warm up
to between 0°C (32°F) and 10°C
(50°F). You will not need to replace
the filter. Additional information on
the fuel filter follows.

Use of biodiesel blends greater than
B5 (5% blend) should be avoided in
cold temperatures.

Water in Fuel

WARNING

{

Diesel fuel containing water is still
flammable. You could be burned.
If you ever try to drain water from
the fuel, keep sparks, flames, and
smoking materials away from the
mixture.

Notice: If there is water in the
diesel fuel and the weather is
warm or humid, fungus and
bacteria can grow in the fuel.
They can damage the fuel system
and fuel operated heater (FOH) (if
equipped). A diesel fuel biocide
can be used to sterilize the fuel
system. However, the fuel system
may still need to be cleaned. Your
dealer can advise you of the
appropriate solution.

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Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

9-28 Driving and Operating

If the fuel tank needs to be
purged to remove water, see your
dealer or a qualified technician.
Improper purging can damage the
fuel system and block the FOH.

Sometimes, water can be pumped
into the fuel tank along with the
diesel fuel. This can happen if a
service station does not regularly
inspect and clean its fuel tanks, or if
it gets contaminated fuel from its
suppliers.

If this happens, a WATER IN FUEL
SERVICE REQUIRED message will
appear on the Driver Information
Center (DIC). The water must be
drained.

Water in Fuel Message Chart

If the WATER IN FUEL SERVICE
REQUIRED message comes on,
use this chart.

Message comes
on but does not
remain on after
an ignition
cycle.

Message remains on after an
ignition cycle:

At temperatures
above freezing.

Problem

Recommended

Action

Water separator
is approximately
half full. Drain
water as soon
as possible.
Water level may
continue to
increase.

Drain fuel filter
immediately.
If no water can
be drained and
message stays
on, see your
dealer for
assistance.

Problem

At temperatures
below freezing.

Immediately
after refueling,
large amount of
water possibly
pumped into
fuel tank.

Notice: Driving when this
warning indicator is on, can
damage the fuel injection system
and the engine. If the indicator
comes on right after a refuel, it

Recommended

Action

Drain fuel filter
immediately.
If no water can
be drained,
water may be
frozen in water
drain system or
fuel lines. Move
the vehicle to a
warm location to
thaw out, and
then drain filter
system.

Fuel tank
purging
required. See
your dealer for
assistance.

Black plate (29,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

Driving and Operating 9-29

means water was pumped into
the fuel tank. Turn off the engine
immediately. Then, have the water
drained at once.

To drain water:

1. Stop and park the vehicle in a
safe place. Turn off the engine
and apply the parking brake.

2. Remove the fuel cap.

Pickup

Van

3. Place a fuel-resistant container
under the fuel filter. For pickup
models, the filter drain valve is
located in the engine
compartment, on the passenger
side of the vehicle, on the
bottom of the fuel filter. For van
models, the filter drain valve is
located under the vehicle on the
driver side (inside frame rail), on
the bottom of the fuel filter.

4. For pickup models, open the
drain valve by turning it two to
three turns. Pump the primer
until all of the water has been
removed. When fuel empties
from the valve, all the water has
been drained. Close the valve
hand tight.

For van models, open the fuel
filter drain valve by turning it two
to three turns. Allow the filter to
drain until all of the water has
been removed. Close the valve
hand tight.

5. Remove the fuel-resistant
container and properly dispose
of the contaminated fuel.

6. Install the fuel cap.

Black plate (30,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

9-30 Driving and Operating

7. For pickup models, start the
engine and let it run for a few
minutes. If the engine stalls, the
fuel system may need to be
primed. While draining the water
from the fuel filter, air may enter
the fuel system. If air has
entered the fuel system, the fuel

eliminate air before operating the
vehicle and the fuel operated
heater (FOH).

If air is in the fuel lines, one of the
following may have happened:

.

.

system will need to be primed.

For van models, start the engine

.

and let it run for a few minutes.

If the WATER IN FUEL SERVICE

.

REQUIRED message/warning light
comes on again after driving a short
distance or the engine runs rough or
stalls, a large amount of water has

.

probably been pumped into the fuel
tank. The fuel tank should be
purged.

Fuel Priming

In order for the fuel system to work
properly, the fuel lines must be full
of fuel and contain no air. If air gets
into the fuel lines, it will be
necessary to prime the fuel lines to

If one or more of the above occur, it
is very likely that air has entered the
fuel system and priming the fuel
system is needed before operating
the vehicle. Air in the fuel lines does
not harm the engine, the FOH,
or the vehicle.

The vehicle ran out of fuel.

The fuel filter was removed for
servicing or replacement.

The fuel lines were removed or
disconnected for servicing.

The fuel filter water drain valve
was opened while the engine
was running.

The fuel operated heater (FOH)
pump and FOH fuel lines were
removed or disconnected for
servicing.

However, the engine and/or the
FOH may not be able to start until
the fuel system is primed and the air
is removed.

To Prime the Vehicle (Pickup
Models)

The vehicle is equipped with a
priming pump which is part of the
engine mounted fuel filter. The
priming pump is hand operated and
is designed to bring fuel to the
engine to eliminate any air in the
fuel lines. To prime the engine:

1. Correct the condition that
caused the loss of prime by
making sure there is fuel in
the tank.

2. Make sure the fuel filter has
been installed and properly
tightened.

3. Make sure the fuel lines are
properly connected and the fuel
filter is cool enough to touch.

4. Remove any dirt from the fuel
filter head and vent valve by
wiping with a cloth.

Black plate (31,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

5. Open the fuel filter vent valve by
turning the screw
counterclockwise several full
turns. The vent valve is located
on top of the fuel filter housing.

6. Repeatedly push down on the
fuel filter priming pump with the
palm of your hand. The pump is
located on top of the fuel filter
housing. Let the pump return
upward between pushes.

7. Operate the priming pump until a
small amount of fuel seeps from
the vent valve. When fuel is
seen, the filter is now full of fuel
and the system should be
primed.

8. Close the vent valve. Clean any
fuel that accumulated on the fuel
filter. Attempt to start the engine.

Driving and Operating 9-31

The engine may start and stall.
If this occurs, operate the
priming pump several times in
between starting attempts. Once
the engine stays running, allow it
to idle for a few minutes. Check
the filter for leaks.

To Prime the Vehicle (Van Models)

The vehicle has an electric priming
pump. The priming pump is
operated electrically and is
designed to bring fuel to the engine
to eliminate any air in the fuel lines.
To prime the engine:

1. Correct the condition that
caused the loss of prime by
making sure there is fuel in
the tank.

2. Turn the ignition key on for
30 seconds. The fuel pump will
be operating and starting the
priming process. Do not start the
engine during the first
30 seconds.

Black plate (32,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

9-32 Driving and Operating

3. After completing the initial prime
in Step 2, turn the ignition off,
then back to start, and crank the
engine for 15 seconds.

4. If the engine does not start,
repeat Steps 2 and 3 until the
engine starts.

5. If the engine does not run after
repeating Steps 2 and 3 three
times, turn the ignition key off for
60 seconds, allowing the
Electronic Control Module (ECM)
to reset.

6. Repeat the above steps until the
engine starts.

7. If the engine runs, but does not
run smoothly, increase the
engine speed slightly by
pressing the accelerator pedal.
This will help to force out air
through the system.

8. If the engine starts and runs but
stalls again, turn the ignition key
off for 60 seconds to reset the
ECM and repeat the steps
above.

9. When the engine starts, let it idle
for a few minutes and check the
filter for any leaks.

To Prime the Fuel Operated Heater
(FOH) Fuel Lines (Van Models)

See your dealer or qualified
technician if the FOH fuel lines need
to be primed.

Running Out of Fuel

Pickup Models

If the engine stalls and you think
that you have run out of fuel, do this
to restart the engine:

WARNING

{

Diesel fuel is flammable. It could
start a fire if it gets on hot engine
parts. You could be burned. Do
not let too much fuel flow from the
air bleed valve, and wipe up any
spilled fuel with a cloth.

1. If parked on a level surface, add
at least 7.6 L (2 gal) of fuel.
However, if parked on a slope,
up to 18.9 L (5 gal) of fuel might
need to be added.

2. Follow the fuel priming
procedure earlier in this section
to prime the fuel filter.

Black plate (33,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

Driving and Operating 9-33

3. Turn the ignition key to START
for 10 to 15 seconds at a time
until the engine starts. If the
engine tries to run, but does not
run smoothly, increase the rpm a
little using the accelerator pedal.
This will help force air through
the system.

4. Return to Step 2 if the engine
stalls and will not restart.

Van Models

If the engine stalls and you think
that you may have run out of fuel,
do this to restart the engine:

1. If parked on a level surface, add
at least 3.8 L (1 gal) of fuel.
However, if parked on a slope,
up to 18.9 L (5 gal) of fuel might
need to be added.

2. Follow the vehicle fuel system
priming procedure earlier in this
section to re-prime the system
and restart the engine.

The check engine light may come
on if the vehicle has run out of fuel.
This light may stay on for a few
drive cycles after the condition is
corrected, but will eventually clear
itself.

The fuel operated heater stops
automatically when the fuel tank
volume is less or equal to 10% of
the total tank volume. If the vehicle
runs out of fuel, the FOH fuel lines
will not need to be primed because
they will still have fuel remaining.

Fuel Filter Replacement

Pickup Models

WARNING

{

Diesel fuel is flammable. It could
start a fire if something ignites it,
and you could be burned. Do not
let it get on hot engine parts, and
keep matches or other ignition
sources away.

Drain any water from the filter
following the procedure for draining
water listed previously.

The vehicle's engine must be off
until the end of this procedure.

The fuel filter is located in the
engine compartment on the
passenger side of the vehicle.

1. Apply the parking brake. Access
the fuel filter through the
passenger side wheel house
opening. It is not necessary to
remove all of the wheel liner
fasteners.

2. Remove only the necessary
fasteners to allow the rear of the
wheel liner to be lowered
enough for fuel filter access.

Black plate (34,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

9-34 Driving and Operating

3. Unplug the water sensor wire
connected to the fuel filter and
unscrew the filter element.

4. Remove the filter element.
If there is any dirt on the filter
sealing surface, clean it off.
Remove and reuse the water
sensor float switch located on
the bottom of the fuel filter.

5. Install the new filter element.

6. Reinstall and tighten the filter
container and reconnect the
water sensor wire to the filter.

7. Reposition the wheel liner.

8. Install and tighten fasteners.

9. Use the fuel filter priming
procedure earlier in this section
to prime the fuel filter.

10. Start the engine and let it idle

for five minutes. Check the fuel
filter and air bleed valve for
leaks.

11. Reset the fuel filter monitor.

See Fuel System Messages on
page 5‑11.

Van Models

If the fuel operated heater (FOH) is
not working, the FOH line requires
priming. See your dealer for service.
See Fuel Operated Heater (FOH) on
page 9‑10.

WARNING

{

Diesel fuel is flammable. It could
start a fire if something ignites it,
and you could be burned. Do not
let it get on hot engine parts, and
keep matches or other ignition
sources away.

Drain any water from the filter
following the procedure for draining
water listed previously.

The vehicle's engine must be off
until the end of this procedure.

The fuel filter and fuel pump screen
are located on the driver side frame
rail in front of the fuel tank.

Black plate (35,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

Driving and Operating 9-35

The fuel pump screen should be
inspected and cleaned if necessary
at each fuel filter inspection or
replacement.

To minimize fuel siphoning from the
fuel tank during fuel filter
replacement, be sure the fuel tank is
less than three-quarters full.

Fuel Filter

1. Apply the parking brake.

2. Unplug the water sensor wire
connected to the fuel filter
(lowest wire) and unscrew the
filter's cap.

3. Remove the filter element.
If there is any dirt on the filter
sealing surface, clean it off.

4. Install the new filter element.

5. Reinstall and tighten the filter's
cap and reconnect the water
sensor wire to the filter.

6. Follow the vehicle fuel system
priming procedure earlier in this
section to re-prime the system.

7. Start the engine and let it idle for
five minutes.

Fuel Pump Screen

1. Apply the parking brake.

2. Unscrew the fuel pump
screen bowl.

3. Remove the filter element.
If there is any dirt on the filter
sealing surface, clean it off.

4. Clean the fuel pump screen and
fuel pump screen bowl o-ring.

5. Inspect the screen and o-ring for
damage. Replace as necessary.

Black plate (36,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

9-36 Driving and Operating

6. Install the fuel pump screen and
o-ring.

7. Install the fuel pump
screen bowl.

8. Follow the vehicle fuel system
priming procedure earlier in this
section to re-prime the system.

9. Start the vehicle and let it idle for
five minutes.

Filling the Tank

WARNING

{

Fuel vapors and fuel fires burn
violently and can cause injury or
death.

.

To help avoid injuries to you
and others, read and follow
all the instructions on the fuel
pump island.

.

Turn off the engine when
refueling.

.

Keep sparks, flames, and
smoking materials away
from fuel.

.

Do not leave the fuel pump
unattended.

(Continued)

WARNING (CONTINUED)

.

Do not reenter the vehicle
while pumping fuel.

.

Keep children away from the
fuel pump and never let
children pump fuel.

.

Fuel can spray out if the fuel
cap is opened too quickly.
This spray can happen if the
tank is nearly full, and is
more likely in hot weather.
Open the fuel cap slowly and
wait for any hiss noise to stop
then unscrew the cap all
the way

Black plate (37,1)

Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

Driving and Operating 9-37

Van Shown, Pickup Similar

The green fuel cap is located behind
a hinged door on the driver side of
the vehicle. On van models, the
blue diesel exhaust fluid cap is also
behind the fuel door. Do not remove
both caps at the same time.

For chassis-cab models, refuel the
front tank first, or in instances when
only a partial fuel fill is desired. An
automatic transfer mechanism will
maintain approximately equal fuel
levels in both tanks, so no switching
is required by the operator.

To remove the fuel cap, turn it
slowly to the left (counterclockwise).

Be careful not to spill diesel fuel. Do
not top off or overfill your tank, and
wait a few seconds after you have
finished pumping before you remove
the nozzle. Clean fuel from painted
surfaces as soon as possible. See
“Washing Your Vehicle” in the owner
manual. When you put the fuel cap
back on, turn it to the right
(clockwise) until you hear a clicking
sound. Make sure you fully install
the cap.

WARNING

{

If a fire starts while you are
refueling, do not remove the
nozzle. Shut off the flow of fuel by
shutting off the pump or by
notifying the station attendant.
Leave the area immediately.

Notice: If you need a new fuel
cap, be sure to get the right type.
Your dealer can get one for you.
If you get the wrong type, it may
not fit properly.

Notice: If your vehicle has been
accidentally filled with gasoline,
do not run the engine or severe
engine damage can occur.
Contact your dealer to have the
fuel system flushed.

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9-38 Driving and Operating

Filling a Portable Fuel Container

WARNING

{

Filling a portable fuel container
while it is in the vehicle can cause
fuel vapors that can ignite either
by static electricity or other
means. You or others could be
badly burned and the vehicle
could be damaged. Always:

.

Use approved fuel
containers.

.

Remove container from
vehicle, trunk, or pickup bed
before filling.

.

Place container on the
ground.

(Continued)

.

.

WARNING (CONTINUED)

Place the nozzle inside the fill
opening of the container
before dispensing fuel, and
keep it in contact with the fill
opening until filling is
complete.

Do not smoke while
pumping fuel.

Towing

Trailer Towing

When towing at high elevation on
steep uphill grades, consider the
following:

Engine coolant at higher elevation
will boil at a lower temperature than
at or near sea level. If the engine is
turned off immediately after towing
at high elevation on steep uphill
grades, the vehicle may show signs
similar to engine overheating. To
avoid this, let the engine run while
parked (preferably on level ground)
with the transmission in P (Park)
and the parking brake applied for at
least five minutes before turning the
engine off. If the overheat warning
comes on, see Engine Overheating
on page 10‑24.

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Driving and Operating 9-39

Use the following chart to determine how much the vehicle can weigh, based upon your vehicle model and options.

Vehicle Axle Ratio Max. Trailer Wt. GCWR *

C-2500 Pickup Models — 2WD

Pickup Model Extended Cab
Standard Box

Pickup Model Crew Cab Standard

1

Box

1

Pickup Model Sierra Denali

Pickup Model Regular Cab Long

1

Box

Pickup Model Extended Cab Long

1

Box

Pickup Model Crew Cab Long

1

Box

K-2500 Pickup Models — 4WD

Pickup Model Extended Cab
Standard Box

Pickup Model Crew Cab Standard

1

Box

1

Pickup Model — Sierra Denali

1

1

3.73 7 938 kg (17,500 lbs) 11 113 kg (24,500 lbs)

3.73 7 893 kg (17,400 lbs) 11 113 kg (24,500 lbs)

3.73 7 484 kg (16,500 lbs) 11 113 kg (24,500 lbs)

3.73 8 074 kg (17,800 lbs) 11 113 kg (24,500 lbs)

3.73 7 893 kg (17,400 lbs) 11 113 kg (24,500 lbs)

3.73 7 575 kg (16,700 lbs) 11 113 kg (24,500 lbs)

3.73 7 439 kg (16,400 lbs) 11 113 kg (24,500 lbs)

3.73 7 167 kg (15,800 lbs) 11 113 kg (24,500 lbs)

3.73 6 668 kg (14,700 lbs) 11 113 kg (24,500 lbs)

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9-40 Driving and Operating

Vehicle Axle Ratio Max. Trailer Wt. GCWR *

Pickup Model Regular Cab Long

1

Box

Pickup Model Extended Cab Long

1

Box

Pickup Model Crew Cab Long

1

Box

C-3500 Pickup Model Extended Cab — 2WD

Single Rear Wheels

Dual Rear Wheels

1

3

C-3500 Pickup Model Crew Cab Standard Box — 2WD

Single Rear Wheels

Single Rear Wheels — Sierra

1

Denali

1

C-3500 Pickup Model Crew Cab Long Box — 2WD

Single Rear Wheels

Dual Rear Wheels

Dual Rear Wheels — Sierra

3

Denali

1

3

3.73 7 938 kg (17,500 lbs) 11 113 kg (24,500 lbs)

3.73 7 121 kg (15,700 lbs) 11 113 kg (24,500 lbs)

3.73 6 668 kg (14,700 lbs) 11 113 kg (24,500 lbs)

3.73 7 847 kg (17,300 lbs) 11 113 kg (24,500 lbs)

3.73 10 342 kg (22,800 lbs) 13 835 kg (30,500 lbs)

3.73 7 802 kg (17,200 lbs) 11 113 kg (24,500 lbs)

3.73 7 756 kg (17,100 lbs) 11 113 kg (24,500 lbs)

3.73 7 847 kg (17,300 lbs) 11 113 kg (24,500 lbs)

3.73 10 342 kg (22,800 lbs) 13 835 kg (30,500 lbs)

3.73 10 251 kg (22,600 lbs) 13 835 kg (30,500 lbs)

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Vehicle Axle Ratio Max. Trailer Wt. GCWR *

K-3500 Pickup Model Regular Cab — 4WD

Single Rear Wheels

Dual Rear Wheels

1

2

3.73 7 893 kg (17,400 lbs) 11 113 kg (24,500 lbs)

3.73 10 478 kg (23,100 lbs) 13 835 kg (30,500 lbs)

K-3500 Pickup Model Extended Cab — 4WD

Single Rear Wheels

Dual Rear Wheels

1

4

3.73 7 666 kg (16,900 lbs) 11 113 kg (24,500 lbs)

3.73 10 251 kg (22,600 lbs) 13 835 kg (30,500 lbs)

K-3500 Pickup Model Crew Cab Standard Box — 4WD

Single Rear Wheels

Single Rear Wheels — Sierra

1

Denali

1

3.73 7 711 kg (17,000 lbs) 11 113 kg (24,500 lbs)

3.73 7 620 kg (16,800 lbs) 11 113 kg (24,500 lbs)

K-3500 Pickup Model Crew Cab Long Box — 4WD

Single Rear Wheels

Dual Rear Wheels

Dual Rear Wheels — Sierra

4

Denali

1

4

3.73 7 620 kg (16,800 lbs) 11 113 kg (24,500 lbs)

3.73 10 206 kg (22,500 lbs) 13 835 kg (30,500 lbs)

3.73 10 115 kg (22,300 lbs) 13 835 kg (30,500 lbs)

Driving and Operating 9-41

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9-42 Driving and Operating

Vehicle Axle Ratio Max. Trailer Wt. GCWR *

Van Models — 2WD

G2500 Cargo Van Short
Wheelbase

G2500 Cargo Van Long
Wheelbase

G3500 Cargo Van Short
Wheelbase

G3500 Cargo Van Long
Wheelbase

G3500 Passenger Van Short
Wheelbase

G3500 Passenger Van Long
Wheelbase

*The Gross Combination Weight Rating (GCWR) is the total allowable weight of the completely loaded vehicle and
trailer including any passengers, cargo, equipment, and conversions. The GCWR for the vehicle should not be
exceeded.

1

Trailer rating limited to 5 897 kg (13,000 lbs) with conventional hitch.

2

Trailer rating limited to 7 257 kg (16,000 lbs) with conventional hitch.

3

Trailer rating limited to 7 484 kg (16,500 lbs) with conventional hitch.

4

Trailer rating limited to 8 165 kg (18,000 lbs) with conventional hitch.

3.54 4 536 kg (10,000 lbs) 7 711 kg (17,000 lbs)

3.54 4 536 kg (10,000 lbs) 7 711 kg (17,000 lbs)

3.54 4 536 kg (10,000 lbs) 7 711 kg (17,000 lbs)

3.54 4 536 kg (10,000 lbs) 8 391 kg (18,500 lbs)

3.54 4 536 kg (10,000 lbs) 7 711 kg (17,000 lbs)

3.54 4 400 kg (9,700 lbs) 7 711 kg (17,000 lbs)

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Driving and Operating 9-43

See “Towing a Trailer” in the owner
manual for kingpin weight and trailer
tongue weight information.

Conversions and Add-Ons

Power Take-Off (PTO)

The PTO is an upfitter integrated
system that allows the user to
create an auxiliary power source for
running add-on equipment, such as
salt spreaders, snow plows,
winches, and lift buckets. The PTO
system controls engine speed to
values higher than normal base idle,
PTO load relay engagement, and
shutdown of the engine.

Primary PTO Operating Modes

PTO modes of operation include:

.

Preset PTO Mode: (Stationary
operation only)

.

Variable PTO Mode: (Stationary
and mobile operation)

The PTO stationary mode provides
both in-cab and remote controls.
The in-cab controls are enabled as
the factory preset. The remote
controls are disabled. This factory

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9-44 Driving and Operating

preset configuration can be
programmed to enable the remote
controls, and/or disable the in-cab
PTO controls. See your dealer for
more information.

PTO Sub-Modes

The primary PTO modes have the
following sub-modes:

.

Engine speed control

.

PTO load relay engagement/

PTO Enabling/Disabling
Conditions

Enabling Conditions –
Stationary PTO

To engage stationary PTO
operation, the following conditions
must be met:

.

.

disengagement

.

Remote engine start and

.

shutdown (Stationary
operation only)

.

PTO load relay engagement/
disengagement is disabled at the
factory. See “Factory Preset

.

Parameters” later in this section.

The engine must be running.

The vehicle cannot be moving
and the parking brake must
be set.

The shift lever must be in
P (Park) or N (Neutral).

The brake pedal must not be
pressed.

The engine speed must be less
than the maximum allowed PTO
engage speed of 1500 rpm. The
PTO engage speed can be
adjusted by a service technician.

For in-cab PTO operation:

Press and release the

R on the PTO

switch. The PTO indicator light will
blink fast until the PTO load
becomes engaged. The indicator
light will then be on steady. The

−/SET and +/RES switch positions
can then be used to establish the
desired PTO operating speed.

For remote PTO operation:

Press and release the remote PTO
arming switch, then within
five seconds, move the PTO enable
switch from OFF to ON (open to
closed). The remote indicator light
will come on when the PTO Load is
engaged. The PTO remote SET
switch can then be used to establish
the desired PTO operating speed.
Additional information is available in
the service manual for the correct
wiring configuration and
programming of the remote PTO
enable and set switches. These
switches are accessed through the
PTO upfitter connector, located
under the passenger side door.

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Enabling Conditions – Mobile PTO

To engage mobile PTO operation,
the following conditions must be met
prior to turning on PTO:

.

The engine must be running.

.

The vehicle speed must be less
than the PTO top vehicle speed
limit. The default setting is
80 km/h (50 mph). This limit can
be adjusted by a service
technician.

.

The shift lever may be in any
position.

.

The brake must be pressed and
then released. The brake must
then remain released.

.

Cruise control cannot be active.

.

Engine speed must be less than
the maximum allowed PTO
engage speed of 1500 rpm.

.

Press and release the R on the
PTO switch. The PTO indicator
light will blink fast until the PTO

DIC WARNING MESSAGES

One or more of the following Driver
Information Center (DIC) messages
may appear on the instrument panel
cluster if the PTO will not engage.
The operator must take the action
indicated, then again press and

release the

.

.

.

.

.

load becomes engaged, at which
point the indicator light will be on

.

steady. The −/SET and +/RES
switch positions can then be
used to establish the desired
PTO operating speed. See
“Variable PTO Mode” and “PTO
Switch Operation” later in this
section.

R on the PTO switch.

PTO: SHIFT TO PARK OR
NEUTRAL (Stationary only)

PTO: SET PARK BRAKE
(Stationary only)

PTO: PRESS & RELEASE
BRAKE (Mobile only)

PTO: RELEASE BRAKE

PTO: REDUCE VEHICLE
SPEED

PTO: REDUCE ENGINE SPEED

Driving and Operating 9-45

.

PTO: DISENGAGE CRUISE
CONTROL (Mobile only)

.

PTO: SPEED RANGE (Program
ECM to match PTO Mode)

In addition to these messages, the
PTO switch indicator light will
indicate when all conditions required
to engage PTO have not been met.
When enabling PTO, the indicator
light will turn on, then off after
one second. Under normal
operating conditions, the PTO
indicator light will remain on
throughout the PTO operating cycle.

PTO load relay engagement/
disengagement is disabled at the
factory. See “Factory Preset
Parameters” later in this section.

PTO Disengage Conditions

To disengage the stationary or
mobile PTO operation, do one of the
following:

.

Press the brake. PTO will
disengage immediately. The
PTO indicator light will blink
slowly, indicating that the PTO

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9-46 Driving and Operating

set speed is stored in memory.
Pressing the +/RES switch
position will restore engine
speed to the stored PTO set
speed. PTO can also be
programmed to reengage at
PTO standby speed upon
releasing the brake pedal
(mobile PTO only).

.

Press and release the 9 on the
PTO in-cab switch. The engine
speed will return to normal
engine idle. The PTO indicator
light will go off indicating the
PTO load relay has been
disengaged and PTO set speed
has been cleared from memory.

.

From the remote PTO controls,
move the speed enable switch to
the off position. The engine will
return to normal idle. The PTO
load relay is disengaged. PTO
memory speed is also cleared
(Stationary PTO only).

.

The mobile PTO mode will also
disengage if the following conditions
are detected by the vehicle
electronics:

.

.

.

.

From the remote PTO controls,
press the remote engine
shutdown switch. PTO is
disengaged and the engine is
shutdown simultaneously
(Stationary remote PTO only).

The PTO load becomes
disengaged. (See service
manual.)

Vehicle speed exceeds 80 km/h
(50 mph).

Engine speed exceeds the
maximum allowed PTO
operating speed of 3100 rpm
(factory setting 2100 rpm).

The PTO control system will
attempt to limit accelerator
pedal and PTO switch input
as the vehicle approaches
the above operational limits.

There are some vehicle
conditions, such as downhill
acceleration, which may cause
vehicle speed and/or engine
speed limits to be exceeded.
Under these conditions, PTO is
disengaged.

The stationary PTO mode will also
disengage if any of the following
conditions are detected by the
vehicle electronics:

.

Movement of the vehicle.

.

The park brake is released.

.

The transmission is shifted from
P (Park) or N (Neutral) to
D (Drive) or R (Reverse).

.

The PTO load becomes
disengaged. (See service
manual.)

Preset PTO Mode

Preset PTO can only be used when
the vehicle is not moving. The
engine speed is initially set to a
stand-by engine speed (850 rpm) by

pressing the PTO in-cab switch

R,

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Driving and Operating 9-47

or by pressing and releasing the
remote arming switch. Then within
five seconds, assert the remote
PTO enable switch to on. This
provides an initial start-up engine
speed to match the engagement of
the PTO load. The PTO standby
engine speed can be reprogrammed
to a higher speed by your dealer.

Choose one of two factory presets
by pressing the PTO in-cab −/SET
or +/RES switch positions or the
remote PTO SET switch.
Speed 1 and Speed 2 are
programmable by a service
technician from base engine idle
rpm to max PTO operation speed
(3100 rpm).

.

Speed 1: Pressing the −/SET
position of the PTO switch
results in a preset speed of
1250 rpm.

.

Speed 2: Pressing the +/RES
position of the PTO switch
results in a preset speed of
1700 rpm.

Pressing the

9 switch position on

the PTO in-cab switch or moving the
remote PTO enable switch to OFF
results in the return of the engine
speed back to normal idle. The PTO
load relay is also disengaged.

Maximum PTO Operating Speed:
During PTO operation, the
accelerator pedal can be pressed to
adjust the engine speed. To protect
the PTO from over-speed, the PTO
system will disengage when the
engine speed exceeds 2100 rpm.

The Stationary PTO Mode provides
both in-cab and remote controls.
The in-cab controls are enabled as
the factory preset. The remote
controls are disabled. This factory
preset configuration can also be
reprogrammed to enable the remote
controls, and disable the in-cab
PTO controls (i.e., PTO switch,
accelerator pedal). See your dealer
for more information.

Variable PTO Mode

In this mode, the vehicle can be
programmed for stationary or mobile
operation.

The variable PTO mode controls
engine speed and PTO load
engagement is selected by either
the PTO in-cab or remote switches.
Engine speed selection is variable
between base engine idle speed
and a maximum of 3100 rpm
(factory setting 2100 rpm).

In the mobile PTO mode, the
vehicle will operate at a vehicle
speed resulting from the current
PTO engine speed request and
current transmission gear range
selected.

Vehicle speed stability is greatly
improved by shifting into the
transmission manual mode because
upshifts are limited. This reduces
the maximum vehicle speed while
allowing high engine speed
operation. Therefore, low vehicle

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9-48 Driving and Operating

speed operation at 16–40 km/h
(10–25 mph) and high PTO engine
speed (1,500–2,000 rpm) can be
achieved in the manual mode 1 and
2 transmission ranges.

PTO Switch Operation

The In-cab PTO switch has four
positions:

R, 9, −/SET, and +/RES.

R : This is the PTO switch ON

position.

To engage PTO, press and release
the in-cab switch

release the remote PTO arming
switch; then within five seconds,
assert the remote enable switch to
ON. The vehicle will increase
engine speed to a factory preset
engine speed (850 rpm). This PTO
stand-by speed is not intended to be
an operational PTO speed, but
allows the engagement of the PTO
at lower initial start-up rpm to match
with the engagement of the PTO
load relay.

R or, press and

The initial stand-by speed can be
adjusted by holding the accelerator
to the desired engine speed, then
pressing and releasing the in-cab

PTO switch
speed will become the new stand-by
speed. This adjustment can only be
done once at the initial engagement
of PTO. The initial stand-by speed
adjustment must be between engine
base idle speed and 1800 rpm
(maximum PTO engage speed).

R. The current engine

9 : This is the PTO switch OFF

position.

Press and release the in-cab
switch position or assert the remote
enable switch to OFF to disengage
PTO. The engine speed will be
reduced to the base idle speed and
the PTO load relay will be
disengaged.

9

−/SET (SET/TAP-DOWN/COAST)

SET: Press and hold the

accelerator to obtain the desired
engine speed, then press and
release the −/SET position of the
PTO switch. The current engine
speed will be maintained.
This action can be repeated as
desired to a higher rpm value. The
PTO set speed cannot exceed
2100 rpm.

TAP-DOWN: Press and release the

−/SET switch position on the PTO
switch to reduce the engine speed
by increments of 100 rpm.

COAST: Press and hold the −/SET
switch position on the PTO switch to
reduce the rpm by 200 rpm per
second until the desired engine
speed is reached or until the initial
PTO standby speed is reached.

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+/RES (RESUME/TAP-UP/ACCEL)

RESUME: When a PTO set speed

has been achieved, press and
release the brake pedal. Engine
speed will reduce to basic idle
speed. The PTO indicator light will
blink slowly indicating the previous
PTO set speed has been retained in
memory. Press and release the
+/RES switch position to resume the
previous PTO set speed. The PTO
set speed cannot exceed 2100 rpm.

TAP-UP: Press and release the
+/RES position to increase the
engine speed by increments of
100 rpm.

ACCEL: Press and hold the +/RES
position to increase the rpm by
200 rpm per second until the desired
engine speed is reached or until the
maximum allowable PTO set speed
is reached.

Remote Engine Start Control

The vehicle’s PTO system allows
the engine to be remotely started
while operating in the stationary
PTO mode. The vehicle wiring
system provides for connections to
a remote start arming switch and
remote engine start switch. These
connections are accessed through
the upfitter connector.

The remote start function is initiated
by a sequence of switch actions, in
addition to several vehicle
conditions. The vehicle ignition key
can be in any position or removed
from the ignition. The following
conditions must be met before
attempting to remote start the
engine:

.

The vehicle must be configured
for stationary PTO operation by
a qualified dealer.

.

The parking brake must be set.

Driving and Operating 9-49

.

The transmission shift lever must
be in P (Park).

.

The vehicle hood must be
closed.

Once the above conditions are met,
continue the remote start by doing
the following steps using the remote
PTO controls:

1. Press and release the remote
start arming switch.

2. Within five seconds of releasing
the remote start arming switch,
press and hold the remote
engine start switch for about
two seconds (horn will sound)
until the engine starts.

3. Release the remote engine start
switch.

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9-50 Driving and Operating

To enable normal PTO operation
after remotely starting the vehicle:

1. Press and release the remote
start arming switch.

2. Within five seconds of releasing
the remote start arming switch,
the PTO remote enable switch
must be moved from OFF
to ON.

3. The PTO system will raise
engine rpm to standby speed
and engage the PTO load.
Press the remote PTO −/SET or
+/RES switch to elevate PTO to
the desired engine operating
speed.

Remote Engine Shutdown
Control

The vehicle’s PTO system allows for
remote engine shutdown while
operating in the stationary PTO
mode. This feature has the following
functions:

.

Engine shutdown using the
operator remote switch: The
vehicle wiring system provides
remote engine shutdown switch
connections, which are
accessed through the PTO
upfitter connector.

.

Timed auto-engine shutdown:
The timed auto-engine shutdown
feature provides the means to
shut down the engine
automatically after a predefined
time. PTO must be operational
for this function to be active.

.

Engine shutdown based on
critical engine conditions: The
engine will be shut down when
PTO is operating if a critical
engine condition is detected by
the vehicle system (i.e., low oil,
low oil pressure, hot engine, hot
transmission, low fuel, diesel
particulate filter regeneration).
If PTO operation is continued
when critical engine conditions
are present, a horn chirp
warning will occur after two to
five minutes. The engine will be
shut down two minutes after the
horn warning. The operator can
re-start the engine with the
ignition key. The above horn
warning and engine shutdown
will again occur if the critical
engine condition is still present.

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Driving and Operating 9-51

Prolonged or Extended PTO
Operation

While operating the vehicle in
stationary PTO mode, the Diesel
Particulate Filter (DPF) will continue
to filter the exhaust and accumulate
soot. The engine control system,
depending on the speed and load
being applied by the PTO, may not
be able to generate enough energy
or adequate heat needed to clean or
regenerate the DPF. Continued
operation under conditions that do
not allow effective regeneration or
cleaning will eventually plug the
DPF and result in reduced power.

The ENGINE POWER IS
REDUCED Driver Information
Center (DIC) message and
malfunction indicator lamp will be
displayed, and dealer service will be
required to return the vehicle to
normal, full power operation. To
prevent this from occurring,
frequently monitor the vehicle during
PTO operation. If the DIC message
is displayed during PTO operation,
see Diesel Particulate Filter on
page 9‑10 for information on how to
clean or regenerate the DPF. Also
see “Remote Engine Shutdown
Control” earlier in this section.

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9-52 Driving and Operating

Factory Preset Parameters

The following table lists the factory preset parameters. These may be altered by the service technician to configure
the various PTO features.

Programmable Parameters Factory Setting Minimum Value Maximum Value

PTO In-cab Control ENABLED DISABLED ENABLED

PTO Remote Control DISABLED DISABLED ENABLED

Type of Set Switch Operation MOMENTARY MOMENTARY LATCHING

Press ON Then Go To Set 1

Speed

Remote Engine Start DISABLED DISABLED ENABLED

Remote Engine Shutdown DISABLED DISABLED ENABLED

Load Feedback DISABLED DISABLED ENABLED

Engage Relay DISABLED DISABLED ENABLED

Keep Relay Engaged During

Braking

Action After Brake Is

Released

Auto Engine Shutdown Timer ENABLED DISABLED ENABLED

Engine Shutdown Due To

Failure

DISABLED DISABLED ENABLED

DISABLED DISABLED ENABLED

RETURN TO BASE

IDLE RPM

DISABLED DISABLED ENABLED

RETURN TO BASE

IDLE RPM

RETURN TO

STANDBY RPM

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Driving and Operating 9-53

Programmable Parameters Factory Setting Minimum Value Maximum Value

Engine Shutdown Warning DISABLED DISABLED ENABLED

Set Low Fuel level For Engine

Shutdown

Engine Run Time While PTO

is Active – Timer

Min. PTO Engage Speed 500 RPM 500 RPM 1800 RPM

Max. PTO Engine Speed 1800 RPM 950 RPM 3100 RPM

PTO Standby RPM 850 RPM

PTO Set Speed 1 1250 RPM

PTO Set Speed 2 1700 RPM

Maximum Operating Speed 2100 RPM 500 RPM 3100 RPM

Tap Step 100 RPM 4 RPM 500 RPM

Ramp Rate 200 RPM 4 RPM 1000 RPM

15% 0 25%

7 Hours 4 minutes 7 hours

500 RPM Normal engine
idle will override if higher

than Standby Speed

500 RPM PTO Set Speed 1

cannot be set below PTO

Standby speed

500 RPM PTO Set Speed 2

cannot be set below PTO

Standby speed

3100 RPM

3100 RPM

3100 RPM

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9-54 Driving and Operating

Programmable Parameters Factory Setting Minimum Value Maximum Value

Maximum Vehicle Speed 129 km/h (80 mph) 30 km/h (18 mph) 129 km/h (80 mph)

Minimum Remote Accelerator

Voltage

Maximum Remote Accelerator

Voltage

Wheel Speed Sensitivity HIGH LOW, MEDIUM, HIGH

Remote Set Switch Transition

to Low Voltage (<1.66 V)

Remote Set Switch Transition

to Open State

(>1.66 V, <3.33 V)

Remote Set Switch Transition

to High Voltage (>3.33 V)

0.25 V 0.0 V 2.5 V

4.75 V 2.5 V 5.0 V

SET SPEED 1 STANDBY SPEED, SET SPEED 1, or SET SPEED 2

PTO STANDBY STANDBY SPEED, SET SPEED 1, or SET SPEED 2

SET SPEED 2 STANDBY SPEED, SET SPEED 1, or SET SPEED 2

If the PTO factory preset
parameters do not match the
settings described above, then they
may have already been altered in

order to satisfy the requirements of
the installed PTO system and body
equipment.

See www.gmupfitter.com for more
information on the installation of
wiring and programming for PTO
aftermarket equipment.

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Vehicle Care 10-1

Vehicle Care

General Information

Accessories and

Modifications . . . . . .. . . . . . . .. 10-1

Vehicle Checks

Engine Compartment

Overview . . . . . . . . . . . .. . . .. . . 10-3

Engine Oil . . . . . . . . . . . . .. . . . .. 10-6

Engine Oil Life System . . . . . . 10-9

Automatic Transmission

Fluid . . . . . . . . . . . . . . . . . . . . . . 10-10

Engine Air Cleaner/Filter . . . . 10-16

Cooling System . . . . . . . . . . . . 10-18

Engine Coolant . . . . . .. . . . . . . 10-20

Engine Overheating . . . . . . . . 10-24

Starter Switch Check . . . . . . . 10-25

Automatic Transmission Shift

Lock Control Function

Check . . . . . . . . . . . .. . . . . . . . . 10-25

Ignition Transmission Lock

Check . . . . . . . . . . . .. . . . . . . . . 10-26

Park Brake and P (Park)

Mechanism Check . . . . . . . . 10-26

Electrical System

Engine Compartment Fuse

Block . . . . . . . . . . . . . . . . . . . . . 10-27

General Information

Accessories and Modifications

Adding non-dealer accessories or
making modifications to the vehicle
can affect vehicle performance and
safety, including such things as
airbags, braking, stability, ride and
handling, emissions systems,
aerodynamics, durability, and
electronic systems like antilock
brakes, traction control, and stability
control. These accessories or
modifications could even cause
malfunction or damage not covered
by the vehicle warranty.

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10-2 Vehicle Care

Damage to vehicle components
resulting from modifications or the
installation or use of non-GM
certified parts, including control
module or software modifications, is
not covered under the terms of the
vehicle warranty and may affect
remaining warranty coverage for
affected parts.

GM Accessories are designed to
complement and function with other
systems on the vehicle. See your
dealer to accessorize the vehicle
using genuine GM Accessories
installed by a dealer technician.

See your vehicle's Warranty booklet
for more information.

Aftermarket Engine
Performance Enhancement
Products and Modifications

Some aftermarket engine
performance products and
modifications promise a way to
increase the horsepower and torque
levels of the vehicle's powertrain.
You should be aware that these
products could have harmful effects
on the performance and life of the
engine, exhaust emission system,
transmission, and drivetrain. The
engines, transmissions, and
drivetrains have been designed and
built to offer industry leading
durability and performance in the
most demanding applications.

Engine power enhancement
products may enable the engine to
operate at horsepower and torque
levels that could damage, create
failure, or reduce the life of the
engine, engine emission system,
transmission, and drivetrain.
Damage, failure, or reduced life of
the engine, transmission, emission
system, drivetrain, or other vehicle
components caused by aftermarket
engine performance enhancement
products or modifications might not
be covered under the vehicle
warranty.

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Vehicle Checks

Engine Compartment Overview

United States Pickup Models Shown, Canada Similar

Vehicle Care 10-3

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10-4 Vehicle Care

A. Coolant Surge Tank and

Pressure Cap

B. Remote Positive (+) Terminal

C. Battery

D. Engine Air Cleaner/Filter

E. Diesel Exhaust Fluid (DEF)

Fill Tube

F. Engine Air Cleaner/Filter

Restriction Indicator (If
Equipped)

G. Engine Oil Dipstick

H. Engine Oil Fill Cap

I. Engine Fan (Out of View)

J. Automatic Transmission

Dipstick

K. Power Steering Fluid Reservoir

L. Brake Fluid Reservoir

M. Auxiliary Battery

N. Underhood Fuse Block

O. Windshield Washer Fluid

Reservoir

P. Remote Negative (-) Terminal

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United States Van Models Shown, Canada Similar

Vehicle Care 10-5

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10-6 Vehicle Care

A. Battery

B. Coolant Surge Tank and

Pressure Cap

C. Automatic Transmission

Dipstick

D. Engine Oil Dipstick

E. Engine Fan (Out of View)

F. Engine Oil Fill Cap

G. Engine Air Cleaner/Filter

H. Air Cleaner/Filter Restriction

Indicator

I. Power Steering Fluid Reservoir

J. Brake Fluid Reservoir

K. Windshield Washer Fluid

Reservoir

Engine Oil

To ensure proper engine
performance and long life, careful
attention must be paid to engine oil.
Following these simple, but
important steps will help protect
your investment:

.

Always use engine oil approved
to the proper specification and of
the proper viscosity grade. See
“Selecting the Right Engine Oil”
in this section.

.

Check the engine oil level
regularly and maintain the
proper oil level. See “Checking
Engine Oil” and “When to Add
Engine Oil” in this section.

.

Change the engine oil at the
appropriate time. See Engine Oil
Life System on page 10‑9.

.

Always dispose of engine oil
properly. See “What to Do with
Used Oil” in this section.

Checking Engine Oil

It is a good idea to check the engine
oil level at each fuel fill. In order to
get an accurate reading, the oil
must be warm, at normal operating
temperature, and the vehicle must
be on level ground. The engine oil
dipstick handle is a loop. See

Engine Compartment Overview on
page 10‑3 for the location of the

engine oil dipstick.

Obtaining an accurate oil level
reading is essential:

1. Turn off the engine and allow at
least five minutes for the oil to
drain back into the oil pan. With
a cool engine, allow 30 minutes.
Checking the oil level too soon
after engine shutoff will not
provide an accurate oil level
reading.

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Vehicle Care 10-7

WARNING

{

The engine oil dipstick handle
may be hot; it could burn you.
Use a towel or glove to touch the
dipstick handle.

2. Pull out the dipstick and clean it
with a paper towel or a cloth,
then push it back in all the way.
Remove it again, keeping the
tip down.

When to Add Engine Oil

If the oil is below the cross-hatched
area at the tip of the dipstick, add
1 L (1 qt) of the recommended oil
and then recheck the level. See
“Selecting the Right Engine Oil” in
this section for an explanation of

what kind of oil to use. For engine
oil crankcase capacity, see

Capacities and Specifications on
page 12‑2.

Notice: Do not add too much oil.
Oil levels above or below the
acceptable operating range
shown on the dipstick are harmful
to the engine. If you find that you
have an oil level above the
operating range, i.e., the engine
has so much oil that the oil level
gets above the cross-hatched
area that shows the proper
operating range, the engine could
be damaged. You should drain
out the excess oil or limit driving
of the vehicle and seek a service
professional to remove the
excess amount of oil.

See Engine Compartment Overview
on page 10‑3 for the location of the

engine oil fill cap.

Be sure to add enough oil to put the
level somewhere in the proper
operating range. Push the dipstick
all the way back in when through.

Selecting the Right Engine Oil

Look for three things:

.

CJ-4

Oils designated as API CJ-4 are
required for the vehicle. The
CJ-4 designation can appear
either alone or in combination
with other American Petroleum
Institute (API) designations, such
as API CJ-4/SL. These letters
show API levels of quality.

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10-8 Vehicle Care

.

SAE 15W-40

SAE 15W-40 is best for the
vehicle. When it is very cold,
below −18°C (0°F), use
SAE 5W-40 to improve cold
starting. These numbers on the
oil container show its viscosity,
or thickness. Do not use other
viscosity oils such as
SAE 10W-30, SAE 10W-40,
or SAE 20W-50.

.

American Petroleum Institute
(API) symbol

This doughnut-shaped logo
(symbol) is used on most oil
containers to help you select the
correct oil. It means that the oil has
been certified by the American
Petroleum Institute.

Look for this on the oil container,
and use only those oils that display
this logo.

Notice: Use only engine oils that
have the designation CJ-4 for the
diesel engine. Failure to use the
recommended oil can damage the
DPF and result in engine damage
not covered by the vehicle
warranty.

Engine Oil Additives/Engine
Oil Flushes

Do not add anything to the oil. The
recommended oils with the API
service symbol are all that is
needed for good performance and
engine protection.

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Vehicle Care 10-9

Engine oil system flushes are not
recommended and could cause
engine damage not covered by the
vehicle warranty.

What to Do with Used Oil

Used engine oil contains certain
elements that can be unhealthy for
your skin and could even cause
cancer. Do not let used oil stay on
your skin for very long. Clean your
skin and nails with soap and water,
or a good hand cleaner. Wash or
properly dispose of clothing or rags
containing used engine oil. See the
manufacturer's warnings about the
use and disposal of oil products.

Used oil can be a threat to the
environment. If you change your
own oil, be sure to drain all the oil
from the filter before disposal. Never
dispose of oil by putting it in the
trash or pouring it on the ground,
into sewers, or into streams or
bodies of water. Recycle it by taking
it to a place that collects used oil.

Engine Oil Life System

When to Change Engine Oil

This vehicle has a computer system
that indicates when to change the
engine oil and filter. This is based
on a combination of factors which
include engine revolutions, engine
temperature, and miles driven.
Based on driving conditions, the
mileage at which an engine oil
change is indicated can vary
considerably. For the oil life system
to work properly, the system must
be reset every time the oil is
changed.

When the system has calculated
that oil life has been diminished, it
indicates that an oil change is
necessary. A CHANGE ENGINE
OIL SOON message comes on.
Change the oil as soon as possible
within the next 1 000 km (600 mi).
It is possible that, if driving under
the best conditions, the oil life
system might indicate that an oil
change is not necessary for up to a
year. The engine oil and filter must

be changed at least once a year
and, at this time, the system must
be reset. Your dealer has trained
service people who will perform this
work and reset the system. It is also
important to check the oil regularly
over the course of an oil drain
interval and keep it at the proper
level.

If the system is ever reset
accidentally, the oil must be
changed at 5 000 km (3,000 mi)
since the last oil change.
Remember to reset the oil life
system whenever the oil is changed.

How to Reset the Engine Oil
Life System

Reset the system whenever the
engine oil is changed so that the
system can calculate the next
engine oil change.

To reset the Engine Oil Life System
on van models:

1. Display the OIL LIFE
REMAINING on the DIC.

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10-10 Vehicle Care

2. Press and hold the SET/RESET
button on the DIC for more than
five seconds. The oil life will
change to 100%.

To reset the Engine Oil Life System
on most pickup models:

1. Display the OIL LIFE
REMAINING on the DIC. If the
vehicle does not have DIC
buttons, the vehicle must be in
P (Park) to access this display.

2. Press and hold the SET/RESET
button on the DIC, or the trip
odometer reset stem if the
vehicle does not have DIC
buttons, for more than
five seconds. The oil life will
change to 100%.

On all models, the Engine Oil Life
System can be reset as follows:

1. Turn the ignition to ON/RUN with
the engine off.

2. Fully press the accelerator pedal
slowly three times within
five seconds.

3. Display the OIL LIFE

4. Turn the key to LOCK/OFF.

If the CHANGE ENGINE OIL SOON
message comes back on when the
vehicle is started, the engine oil life
system has not reset. Repeat the
procedure.

Automatic Transmission Fluid

When to Check and Change
(Pickup Models)

Change the fluid and filter at the
intervals listed. See Maintenance
Schedule on page 11‑3.

And be sure to use the transmission
fluid listed in Recommended Fluids
and Lubricants on page 11‑12.

REMAINING on the DIC. If the
display shows 100%, the system
is reset.

How to Check

Because this operation can be a
little difficult, the decision may be
made to have this done at the
dealer.

If the decision is made to perform
this operation, be sure to follow all
the instructions here, or a false
reading on the dipstick could result.

Notice: Too much or too little
fluid can damage the
transmission. Too much can
mean that some of the fluid could
come out and fall on hot engine
parts or exhaust system parts,
starting a fire. Too little fluid
could cause the transmission to
overheat. Be sure to get an
accurate reading if checking the
transmission fluid.

Wait at least 30 minutes before
checking the transmission fluid level
if the vehicle has been driven:

.

When outside temperatures are
above 32°C (90°F).

.

At high speed for quite a while.

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.

In heavy traffic — especially in
hot weather.

.

While pulling a trailer.

Checking the Fluid Level

Prepare the vehicle as follows:

.

Park the vehicle on a level
place. Keep the engine running.

.

With the parking brake applied,
place the shift lever in P (Park).

.

With foot on the brake pedal, run
the engine for at least
one minute and shift to D
(Drive). Then shift to N (Neutral)
and then R (Reverse) to fill the
hydraulic system. Then, put the
shift lever in P (Park).

.

Allow the engine to run at idle
(500 – 800 rpm). Slowly release
the brake pedal.

Then, without shutting off the
engine, follow these steps:

Cold Check Procedure

The purpose of the cold check is to
determine if the transmission has
enough fluid to be operated safely
until a hot check can be made. The
fluid level rises as fluid temperature
increases. DO NOT fill above the
COLD CHECK band if the
transmission fluid is below normal
operating temperatures.

1. Pull out the dipstick and wipe it
with a clean rag or paper towel.
The transmission dipstick is
located near the center of the
engine compartment. See

Engine Compartment Overview
on page 10‑3 for location.

2. Push it back in all the way, wait
three seconds, and then pull it
back out again.

3. Check the fluid level reading.
Repeat the check procedure to
verify the reading.

Vehicle Care 10-11

4. If the fluid level is within the
COLD CHECK band, the
transmission may be operated
until the fluid is hot enough to
perform a hot check. If the fluid
level is not within the COLD
CHECK band, add or drain fluid
as necessary to bring the level
into the middle of the COLD
CHECK band.

5. Perform a hot check at the first
opportunity after the normal
operating temperature of 71°C
(160°F) to 93°C (200°F) is
reached.

6. If the fluid level is in the
acceptable range, push the
dipstick back in all the way.

Hot Check Procedure

The fluid must be hot to ensure an
accurate check. The fluid level rises
as temperature increases.

1. Operate the transmission in D
(Drive) until the normal operating
temperature of 71°C (160°F) to
93°C (200°F) is reached.

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10-12 Vehicle Care

2. Pull out the dipstick and wipe it
with a clean rag or paper towel.

3. Push it back in all the way, wait
three seconds and then pull it
back out again. Repeat the
check procedure to verify the
reading.

4. Safe operating level is within the
HOT RUN band on the dipstick.
The width of the HOT RUN band
represents approximately 1.0 L
(1.06 qt) of fluid at normal
operating temperature.

5. If the fluid level is not within the
HOT RUN band, add or drain
fluid as necessary to bring the
fluid level to within the HOT
RUN band.

6. If the fluid level is in the
acceptable range, push the
dipstick back in all the way.

Consistency of Readings

Always check the fluid level at least
twice using the procedures
described previously. Consistency is
important to maintaining proper fluid

level. If inconsistent readings
persist, check the transmission
breather to be sure it is clean and
unclogged. If readings are still
inconsistent, contact the dealer.

How to Add Fluid

In cold operation, Allison
recommends using Synthetic
Transmission Fluid approved to
Allison Transmission specification
TES-295 in areas where the
minimum ambient temperatures are
below −40°C (−40°F).

Refer to the Maintenance Schedule
to determine what kind of
transmission fluid to use. See

Recommended Fluids and
Lubricants on page 11‑12.

Add fluid only after checking the
transmission fluid while it is hot.
A cold check is used only as a
reference. If the fluid level is low,
add only enough of the proper fluid
to bring the level up to the HOT area
for a hot check. It does not take
much fluid, generally less than 0.5 L
(1 pint). Do not overfill.

Notice: Use of the incorrect
automatic transmission fluid may
damage the vehicle, and the
damages may not be covered by
the vehicle warranty. Always use
the automatic transmission fluid
listed in Recommended Fluids
and Lubricants on page 11‑12.

.

After adding fluid, recheck the
fluid level as described under
“How to Check.”

.

When the correct fluid level is
obtained, push the dipstick back
in all the way.

When to Check and Change
(Van Models)

Change the fluid and filter at the
intervals listed. See Maintenance
Schedule on page 11‑3.

Use the transmission fluid listed in

Recommended Fluids and
Lubricants on page 11‑12.

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How to Check

Because this operation can be a
little difficult, the decision may be
made to have this done at the
dealership service department.

If the decision is made to perform
this operation, be sure to follow all
the instructions here, or a false
reading on the dipstick could result.

Notice: Too much or too little
fluid can damage the
transmission. Too much can
mean that some of the fluid could
come out and fall on hot engine
parts or exhaust system parts,
starting a fire. Too little fluid
could cause the transmission to
overheat. Be sure to get an
accurate reading if checking the
transmission fluid.

Wait at least 30 minutes before
checking the transmission fluid level
if the vehicle has been driven:

.

When outside temperatures are
above 32°C (90°F).

.

At high speed for quite a while.

.

.

To get the right reading, the fluid
should be at normal operating
temperature, which is 82°C to 93°C
(180°F to 200°F). Get the vehicle
warmed up by driving about 24 km
(15 mi) when outside temperatures
are above 10°C (50°F). If it is colder
than 10°C (50°F), drive the vehicle
until the engine temperature gauge
moves and then remains steady for
10 minutes.

A cold check can be made after the
vehicle has been sitting for eight
hours or more with the engine off,
but this is used only as a reference.
Let the engine run at idle for
five minutes if outside temperatures
are 10°C (50°F) or more. If it is
colder than 10°C (50°F), the engine
may have to idle longer. Should the
fluid level be low during this cold
check, the fluid must be checked
when hot before adding fluid.

In heavy traffic — especially in
hot weather.

While pulling a trailer.

Vehicle Care 10-13

Checking the fluid hot will give you
a more accurate reading of the fluid
level.

Checking the Fluid Level

Prepare the vehicle as follows:

.

Park the vehicle on a level
place. Keep the engine running.

.

With the parking brake applied,
place the shift lever in P (Park).

.

With foot on the brake pedal,
move the shift lever through
each gear range, pausing for
about three seconds in each
range. Then, position the shift
lever in P (Park).

.

Let the engine run at idle for
three minutes or more.

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10-14 Vehicle Care

Then, without shutting off the
engine, follow these steps:

The transmission dipstick is located
near the center of the engine
compartment and will be labeled
with the graphic shown.

See Engine Compartment Overview
on page 10‑3 for location.

1. Flip the handle up and then pull
out the dipstick and wipe it with
a clean rag or paper towel.

2. Push it back in all the way, wait
three seconds, and then pull it
back out again.

Check both sides of the dipstick,
and read the lower level. The
fluid level must be in the COLD
area for a cold check or in the
HOT or cross-hatched area for a
hot check. Be sure to keep the
dipstick pointed down to get an
accurate reading.

3. If the fluid level is in the
acceptable range, push the
dipstick in all the way, then flip
the handle down to lock the
dipstick in place.

What Transmission Fluid
to Use

Cold Operation

When temperatures are very cold,
the transmission will prevent certain
operations to protect against
damage. The information below
shows shift range availability based
on transmission oil temperatures:

.

All shift ranges available at

−25°C (−13°F) or above.

.

2 (Second) and 3 (Third) shift
ranges only at −35°C (−31°F) to

−25°C (−13°F).

.

2 (Second) shift range only at

−35°C (−31°F) or lower.

Torque converter clutch operation
will also be prevented when air or
transmission oil temperatures are
below certain levels.

Transmission shifting might be
firmer with a cold transmission. This
difference in shift quality is normal.

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Vehicle Care 10-15

A. For areas where ambient

temperatures stay above −40°C
(−40°F), regular transmission
fluid can be used. See

Recommended Fluids and
Lubricants on page 11‑12.

B. For areas where ambient

temperatures fall below −40°C
(−40°F), synthetic transmission
fluid approved to Allison
Transmission Specification
should be used. See

Recommended Fluids and
Lubricants on page 11‑12.

The synthetic transmission fluid
can be used for all temperature
ranges.

How to Add Fluid

Refer to the Maintenance Schedule
to determine what kind of
transmission fluid to use. See

Recommended Fluids and
Lubricants on page 11‑12.

Using a funnel, add fluid down the
transmission dipstick tube only after
checking the transmission fluid
while it is hot. A cold check is used
only as a reference. If the fluid level
is low, add only enough of the
proper fluid to bring the level up to
the HOT area for a hot check.
It does not take much fluid,
generally less than 0.5 L (1 pint). Do
not overfill.

Notice: Use of the incorrect
automatic transmission fluid may
damage the vehicle, and the
damages may not be covered by
the vehicle warranty. Always use
the automatic transmission fluid
listed in Recommended Fluids
and Lubricants on page 11‑12.

.

After adding fluid, recheck the
fluid level as described under
“How to Check” earlier in this
section.

.

When the correct fluid level is
obtained, push the dipstick back
in all the way. Then flip the
handle down to lock the dipstick
in place.

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10-16 Vehicle Care

Engine Air Cleaner/Filter

Pickup Models

The air cleaner/filter assembly may
have an air cleaner/filter restriction
indicator that shows when the
engine air cleaner/filter is dirty and
needs to be serviced.

The air cleaner/filter restriction
indicator is located on the air
cleaner box.

When to Inspect

Inspect the air cleaner/filter every
25 000 km (15,000 mi) and replace
the filter if necessary.

How to Inspect

When the restriction indicator turns
black, or is in the red/orange
“change” zone, replace the filter and
reset the restriction indicator. The
air cleaner/filter assembly is located
on the front corner of the engine
compartment on the passenger side
of the vehicle.

To inspect and replace the filter and
reset the restriction indicator:

A. Clamp

B. Cover Electrical Connector

C. Restriction Indicator

D. Cover Screws

1. Disconnect the harness
connector from the air cleaner
cover electrical connector (B).

2. Loosen the screw on the
clamp (A) holding the air outlet
duct in place. Do not remove the
clamp. Move the air duct aside.

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Vehicle Care 10-17

3. Remove the two air cleaner
housing cover screws (D).

4. Raise the air cleaner housing
cover and remove the air
cleaner/filter from the air cleaner
housing. Care should be taken
to dislodge as little dirt as
possible.

5. Clean the filter sealing surface
and the housing.

6. Install the new engine air
cleaner/filter.

7. Lower the air cleaner housing
cover and secure with the two
screws.

8. Install the air duct and tighten
the screw on the clamp to
secure it to the air cleaner
housing.

9. Install the harness electrical
connector.

10. Reset the air cleaner/filter

restriction indicator (C),
if equipped, by pressing the top
button on the indicator.

See Maintenance Schedule on
page 11‑3 to determine when to
replace the engine air cleaner/filter.

WARNING

{

Operating the engine with the air
cleaner/filter off can cause you or
others to be burned. The air
cleaner not only cleans the air; it
helps to stop flames if the engine
backfires. Use caution when
working on the engine and do not
drive with the air cleaner/filter off.

Notice: If the air cleaner/filter is
off, dirt can easily get into the
engine, which could damage it.
Always have the air cleaner/filter
in place when you are driving.

Van Models

The air cleaner/filter assembly may
have an air cleaner/filter restriction
indicator that shows when the
engine air cleaner/filter is dirty and
needs to be serviced.

The air cleaner/filter restriction
indicator is located on the air
cleaner resonator.

When to Inspect

See Maintenance Schedule on
page 11‑3.

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Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

10-18 Vehicle Care

How to Inspect

When the restriction indicator is in
the red/orange “change” zone,
replace the filter and reset the
restriction indicator. The air cleaner/
filter assembly is located at the front
of the engine compartment.

To inspect and replace the filter and
reset the restriction indicator:

A. Cover Screws

B. Restriction Indicator

1. Loosen the screws (A) on the
cover of the housing and lift up
the cover.

2. Remove the air cleaner/filter

3. Clean the filter sealing surface

4. Install the new engine air

5. Reinstall the cover and tighten

6. Reset the air cleaner/filter

See Maintenance Schedule on
page 11‑3 to determine when to
replace the engine air cleaner/filter.

Operating the engine with the air
cleaner/filter off can cause you or
others to be burned. The air
cleaner not only cleans the air; it

from the housing. Care should
be taken to dislodge as little dirt
as possible.

and the housing.

cleaner/filter.

the screws.

restriction indicator (B),
if equipped, by pressing the top
button on the indicator.

WARNING

{

(Continued)

WARNING (CONTINUED)

helps to stop flames if the engine
backfires. Use caution when
working on the engine and do not
drive with the air cleaner/filter off.

Notice: If the air cleaner/filter is
off, dirt can easily get into the
engine, which could damage it.
Always have the air cleaner/filter
in place when you are driving.

Cooling System

The cooling system allows the
engine to maintain the correct
working temperature.

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Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

Vehicle Care 10-19

Pickup Models

A. Coolant Surge Tank

B. Coolant Surge Tank

Pressure Cap

C. Engine Cooling Fan (Out

of View)

Van Models

A. Coolant Surge Tank

B. Coolant Surge Tank

C. Engine Cooling Fan (Out

Pressure Cap

of View)

WARNING

{

Heater and radiator hoses, and
other engine parts, can be very
hot. Do not touch them. If you do,
you can be burned.

Do not run the engine if there is a
leak. If you run the engine, it
could lose all coolant. That could
cause an engine fire, and you
could be burned. Get any leak
fixed before you drive the vehicle.

Notice: Using coolant other than
DEX-COOL
engine, heater core, or radiator
corrosion. In addition, the engine
coolant could require changing
sooner, at 50 000 km (30,000 mi)
or 24 months, whichever occurs
first. Any repairs would not be
covered by the vehicle warranty.
Always use DEX-COOL
(silicate-free) coolant in the
vehicle.

®

can cause premature

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Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12

10-20 Vehicle Care

Engine Coolant

The cooling system in the vehicle is
filled with DEX-COOL
coolant. This coolant is designed to
remain in the vehicle for 5 years or
240 000 km (150,000 mi), whichever
occurs first, if you add only
DEX-COOL extended life coolant.

The following explains the cooling
system and how to add coolant
when it is low. If there is a problem
with engine overheating, see Engine
Overheating on page 10‑24.

A 50/50 mixture of clean, drinkable
water and DEX-COOL coolant will:

.

Give freezing protection down to

−37°C (−34°F).

.

Give boiling protection up to
129°C (265°F).

.

Protect against rust and

®

engine

Notice: Using coolant other than
DEX-COOL may cause premature
engine, heater core, radiator, and
fuel operated heater (van models
only) corrosion. In addition, the
engine coolant may require
changing sooner, at 50 000 km
(30,000 mi) or 24 months,
whichever occurs first. Any
repairs would not be covered by
the vehicle warranty. Always use
DEX-COOL (silicate-free) coolant
in the vehicle.

What to Use

Use a 50/50 mixture of clean,
drinkable water and DEX-COOL
coolant which will not damage
aluminum parts. If using this
mixture, nothing else needs to be
added.

corrosion.

.

Help keep the proper engine
temperature.

.

Let the warning lights and

Adding only plain water or some
other liquid to the cooling system
can be dangerous. Plain water

gauges work as they should.

WARNING

{

WARNING (CONTINUED)

and other liquids, can boil before
the proper coolant mixture will.
The vehicle's coolant warning
system is set for the proper
coolant mixture. With plain water
or the wrong mixture, the engine
could get too hot but you would
not get the overheat warning. The
engine could catch fire and you
or others could be burned. Use a
50/50 mixture of clean, drinkable
water and DEX-COOL coolant.

Notice: If an improper coolant
mixture is used, the engine could
overheat and be badly damaged.
The repair cost would not be
covered by the vehicle warranty.
Too much water in the mixture
can freeze and crack the engine,
radiator, heater core, and other
parts.

(Continued)