Chevrolet Silverado 1500 2011, Silverado 2500HD 2011, Silverado 3500HD 2011, Silverado Hybrid 2011 Supplementary Manual
USING DIESEL EXHAUST
FLUID WITH THE DURAMAX
6.6L TURBO-DIESEL
THE MOST POWERFUL DURAMAX DIESEL EVER
NOW RUNS CLEANER TOO!
USING DIESEL EXHAUST FLUID
NEW SYSTEM REDUCES TAILPIPE NO EMISSIONS
The enhanced, legendary Duramax 6.6L Turbo-Diesel is the most powerful
Duramax ever built—generating more horsepower and torque than any
competitor. This proven powerplant gets the job done while being friendlier
to the environment.
The improved Duramax uses the latest emission control technology, reducing
Nitrogen Oxide (NOx) emissions by a whopping 63%, when compared to
the 2010 model. GM engineers determined the best way to accomplish this
remarkable reduction of diesel emissions was to employ a Selective Catalytic
Reduction (SCR) system that uses Diesel Exhaust Fluid (DEF).
TABLE OF CONTENTS
Reduced Tailpipe Emissions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Selective Catalytic Reduction (SCR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Diesel Exhaust Fluid (DEF). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electronic Onboard Warning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Frequently Asked Questions (FAQs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
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SELECTIVE CATALYTIC REDUCTION (SCR)
The SCR system is an after-treatment system, since it treats the vehicle’s
exhaust after combustion.
Here’s how it works:
A fine mist of DEF is injected into the exhaust while the engine is running.
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The heat from the exhaust converts the DEF into ammonia.
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When the ammonia, mixed with exhaust gases, reaches the SCR
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catalyst, the NOx emissions are broken down.
The Diesel Particulate Filter (DPF) then captures soot to incinerate
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it during regeneration cycles.
Water vapor, nitrogen and reduced emissions exit the exhaust system.
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ENGINE
Exhaust
Flow
DEF Tank
Diesel
Oxidation
Catalyst
Combined SCR and DPF
1
2
SCR DPF
3
4
Exhaust
Cooler
5
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USING DIESEL EXHAUST FLUID
DIESEL EXHAUST FLUID (DEF)
Diesel Exhaust Fluid (DEF) is a non-flammable fluid comprised of 33%
ammonia-based urea and 67% purified water. DEF is used with diesel engine
exhaust systems to reduce the amount of emissions produced by turning
Nitrogen Oxide (NOx) into nitrogen and water vapor. DEF technology has a
proven track record since it has been used in Europe for years.
Driving Range between DEF Tank Refills
The SCR system uses DEF at a rate of about 1 to 1.25% of the vehicle’s
diesel fuel usage. A full tank of DEF provides a driving range of about
5,000 miles (8,000 kilometers). Since DEF usage is directly related to fuel
consumption, range will vary depending on driving conditions.
Purchasing DEF
DEF is available at GM dealerships and most major truck stop chains. GM DEF
is available in a variety of package sizes to service both individual consumers
and fleets, including: 1- and 2.5-gallon jugs, 55-gallon drums and 330-gallon
totes. For your convenience, listed below are the GM part numbers for the
1- and 2.5-gallon sizes.
• 1-gallon part number is 88862659
• 2.5-gallon part number is 88863523
If purchasing DEF outside of a dealership, you
must use API-certified or ISO 22241 labeled DEF.
If you need assistance locating DEF, the U.S.
Department of Energy has a DEF locator
on its website that is regularly updated.
You can visit the website at:
afdc.energy.gov/afdc/locator/def/
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