Chevrolet Impala Bi-fuel 2016 User Manual

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . 2

Instruments and Controls . . . . . . . . 3

Driving and Operating . . . . . . . . . . . 7

Vehicle Care . . . . . . . . . . . . . . . . . . . . 16

Service and Maintenance . . . . . . . 21

Technical Data . . . . . . . . . . . . . . . . . 25

Index . . . . . . . . . . . . . . . . . . . . . 27

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15

2 Introduction

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,
the CHEVROLET Emblem, IMPALA,
and the IMPALA Emblem are
trademarks and/or service marks of
General Motors LLC, its
subsidiaries, affiliates, or licensors.

This manual describes features that
may or may not be on the vehicle
because of optional equipment that
was not purchased on the vehicle,
model variants, country
specifications, features/applications

Litho in U.S.A.
Part No. 23343095 A First Printing

that may not be available in your
region, or changes subsequent to
the printing of this owner manual.

Refer to the purchase
documentation relating to your
specific vehicle to confirm the
features.

This vehicle is designed to operate
on gasoline or Compressed Natural
Gas (CNG).

Keep this manual in the vehicle for
quick reference.

Canadian Vehicle Owners

Propriétaires Canadiens

A French language manual can be
obtained from your dealer, at
www.helminc.com, 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.

©

2015 General Motors LLC. All Rights Reserved.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15

Instruments and Controls 3

Instruments and Controls

Warning Lights, Gauges, and Indicators

Fuel Gauge . . . . . . . . . . . . . . . . . . . . . 3

Malfunction Indicator Lamp

(Check Engine Light) . . . . . . . . . . 4

Low Fuel Warning Light . . . . . . . . . 5

Information Displays

Driver Information

Center (DIC) . . . . . . . . . . . . . . . . . . . 5

Vehicle Messages

Fuel System Messages . . . . . . . . . 6

Warning Lights,
Gauges, and
Indicators

Fuel Gauge

The vehicle has a fuel gauge that
displays either gasoline or CNG fuel
level.

Metric

English

With the ignition on, the gasoline/
CNG fuel gauge indicates remaining
fuel in the tank for the fuel that is
being used. See “Fuel Selector
Switch” under Fuel 0 8.

To check the level of the fuel not
being used, see Driver Information
Center (DIC) 0 5.

For CNG, the fuel gauge has been
calibrated to display full at
approximately 24 800 kPa
(3,600 psig) and empty at
approximately 2 758 kPa (400 psig).

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15

4 Instruments and Controls

CNG fuel gauge readings are
affected by changes in fuel
temperature and fuel pressure.

See “Fuel Gauge” in the owner
manual.

apparent. This system is also
designed to assist the service
technician in correctly diagnosing
any malfunction.

Caution

Malfunction Indicator Lamp (Check Engine Light)

The malfunction indicator lamp is in
the instrument cluster.

This vehicle has been specifically
designed to illuminate this indicator
when emissions exceed acceptable
levels while operating on either
gasoline or CNG fuel.

The malfunction indicator lamp
comes on to indicate that there is a
problem and service is required.
Malfunctions often will be indicated
by the system before any problem is

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.

This light should come on as a
check to show you it is working
when the ignition is on and the
engine is not running.

This light comes on during a
malfunction in one of two ways:

Light Flashing

A misfire condition has been
detected. A misfire increases
vehicle emissions and could

damage the emission control
system on the vehicle. Diagnosis
and service might be required.

To prevent more serious damage to
the vehicle:

.

Reduce vehicle speed.

.

Avoid hard accelerations.

.

Avoid steep uphill grades.

If the light continues to flash, find a
safe place to stop and park the
vehicle. Turn the vehicle off, wait at
least 10 seconds, and restart the
engine. If the light is still flashing,
follow the previous steps and see
your dealer for service as soon as
possible.

Light On Steady

An emission control system
malfunction has been detected on
the vehicle. Diagnosis and service
might be required.

See the owner manual for more
information.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15

Instruments and Controls 5

Low Fuel Warning Light

This light is near the fuel gauge and
comes on briefly when the ignition is
turned on as a check to show it is
working.

It also comes on when the fuel tank
is low on the fuel that is in operation
(gasoline or CNG).

Information Displays

Driver Information Center (DIC)

The DIC displays are shown in the
center of the instrument cluster in
the Info app. A bi-fuel vehicle will
have the following additional DIC
info pages.

DIC Info Pages

Fuel Level : While operating on

CNG, the gasoline fuel level can be
viewed in the DIC.

CNG Fuel Level : While operating
on gasoline, the CNG fuel level can
be viewed in the DIC.

Fuel Range : Displays the
approximate distances the vehicle
can be driven with gasoline and
CNG without refueling. A total
distance with both gasoline and

CNG distances combined is also
displayed. LOW will be displayed
when the vehicle is low on fuel. The
fuel range estimate is based on an
average of the vehicle’s current fuel
economy.

Average Fuel Economy (AFE) :

Located in the Trip A page of the
DIC, the AFE is shown for the fuel
that is in operation. The value
shown is the average for the fuel
used since the last Trip A reset
while running on that fuel. If no reset
occurs, the AFE value for each fuel
will continually recalculate the
average from the last reset.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15

6 Instruments and Controls

Vehicle Messages

Fuel System Messages

FUEL MODE UNAVAILABLE

This message displays when the
current fuel mode selected is empty
or unavailable. See “Fuel Selector
Switch” under Fuel 0 8. The vehicle
will switch fuel modes automatically.
This is usually due to a low fuel
condition of the fuel type selected or
the engine is not warm enough after
an initial engine start up.

This message will also appear if the
vehicle has initiated a gasoline
system maintenance routine.
A switch to CNG will not be
available until this routine is
complete.

This message can also appear if a
transition to CNG is attempted in
cold start conditions. See “Cold
Weather Starting” under Starting the
Engine 0 7.

This message may also appear if
the CNG tank valve is unable to
open fully during some vehicle
operating conditions.

SERVICE FUEL SYSTEM PARK
IN OPEN AREA

This vehicle is equipped with a CNG
fuel system diagnostic to ensure
proper function. This message
displays when the CNG fuel system
requires service.

Park the vehicle in an outdoor open
area, do not start the engine, refuel,
or drive the vehicle. Have the
vehicle towed to an authorized GM
dealer for service.

See Fuel System Leak 0 14.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15

Driving and Operating 7

Driving and Operating

Driving Information

Vehicle Load Limits

Driving Information

Vehicle Load Limits . . . . . . . . . . . . . 7

Starting and Operating

Starting the Engine . . . . . . . . . . . . . . 7

Ride Control Systems

Traction Control/Electronic

Stability Control . . . . . . . . . . . . . . . . 8

Fuel

Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Filling the Tank (CNG) . . . . . . . . . . 9

Fuel System Leak . . . . . . . . . . . . . 14

Loose items stored in the cargo
area may damage the CNG fuel
tank and fuel system
components. Secure all items in
the cargo area to avoid shifting
and any damage to the CNG fuel
tank and CNG fuel tank
components.

Trailer Towing

Trailer Towing . . . . . . . . . . . . . . . . . . 15

Caution

Starting and
Operating

Starting the Engine

Starting the engine in a CNG
vehicle is similar to starting a
gasoline engine. See “Starting the
Engine” in the owner manual.

Fuel Selection

A switch allows the selection of fuel.
See Fuel 0 8. The vehicle typically
defaults to the fuel used on the last
key cycle.

If a tank refill has occurred after an
automatic low fuel level transition
from one fuel to another, CNG to
gasoline for example, the vehicle
recognizes the refill and if conditions
are met, will start on the fuel last
selected on the switch.

To protect engine and gasoline fuel
system components, an automatic
switch to gasoline may occur at any
time. The vehicle will transition back
to CNG automatically once the
gasoline system has run for a pre–
set time.

Chevrolet Impala Bi-Fuel (Gasoline/CNG) Supplement (GMNA-Localizing-U.
S/Canada-9087624) - 2016 - CRC - 8/17/15

8 Driving and Operating

Cold Weather Starting

If the outside temperature is below
2 °C (35 °F), the engine may start on
gasoline when CNG is selected.
After starting on gasoline, the
vehicle will automatically transition
to CNG operation after a set amount
of warm-up time.

Using the engine heater,
if equipped, may make it easier to
start. See “Engine Heater” in the
owner manual.

.

Turn off all electrical
accessories.

.

Do not hold the ignition switch in
START for more than
15 seconds.

Ride Control Systems

Traction Control/ Electronic Stability Control

This vehicle has Traction Control
System (TCS) and StabiliTrak
electronic stability control systems.
These systems are enabled
automatically and StabiliTrak cannot
be turned off. To turn off TCS, see
“Traction Control/Electronic Stability
Control” in the owner manual.

Caution

If you add electrical parts or
accessories, you could change
the way the engine operates. Any
resulting damage would not be
covered by the vehicle warranty.
See “Add-On Electrical
Equipment” in the owner manual.

Fuel

If a fuel leak is suspected, see Fuel
System Leak 0 14.

.

If the vehicle runs out of CNG or
gasoline, it will automatically
switch to the other fuel system,

®

if there is fuel.

.

If it takes unusually long to fill
the CNG cylinder, the fuel fill
receptacle may be clogged.
Contact your dealer for
inspection and/or replacement.
See “Fuel Filling Problems” in
Filling the Tank (CNG) 0 9.

This vehicle is designed to operate
on gasoline or CNG and has a
gasoline tank and a CNG fuel
storage system. See “Fuel” in the
owner manual for gasoline
information.

The general marketplace fuel quality
of CNG (for motor vehicles) in the
state of California should be in
compliance with Title 13 California
Code of Regulations, Section

2292.5. The remaining regions of
North America do not employ
regulated CNG fuel quality