Exhaust Fluid is a non-flammable fluid comprised of 33% Amonia 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 been
used in diesel engines in Europe and has a proven track record.
How often do I have to fill my DEF Tank?
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 (20 Liters) provides a driving
range of about 8000 Kilometers. DEF usage is directly related to fuel
consumption, so range can be affected by the type of driving and
Where can I purchase DEF? DEF
is available at all GM Dealers and most major truck stop chains.
Competition Chevrolet offers DEF Fluid in the following sizes:
3.78L (1 US Gallon)- $12.25 (GM PART# 88862660) 9.46L (2.5 US Gallons)- $21.35 (GM PART #88863524
DEF Fluid can be purchased in our Parts Department at (780) 963-8999. How Do I Refill My DEF Tank? DEF
is stored in a 20 Liter (5.3 US Gallon) Tank located under the
passenger side of the cab. The DEF tank fill point is located under
the hood on the passenger side of the cab. It is identifiable with a
How do I know when my DEF tank is low?
Chevrolet Silverado has an Electronic Onboard Warning System that will
provide a message that alerts the driver when the DEF level is low and
has a remaining range (at current rate of usage) of 1600 Km.
Additional messages will alert the driver at the 500 KM, Low, and 0 Km
ranges as the DEF Tank gradually empties.
What happens if I run out of DEF?
the DEF Tank is allowed to run empty, the Onboard Warning System will
alert the driver. If fluid is not added at the next vehicle start, the
vehicle speed will be reduced to a maximum of 90 Km/Hour and ultimately
to 5 Km/Hour as per Federal and Provincial Government Guidelines.
My vehicle speed has been reduced to 5 Km/Hour. Do I have to bring it to the dealer to have it repaired?
DEF Tank is empty. Add at least 3.78L of DEF Fluid to release the
vehicle from any speed limitation. Once the system is refilled, the
system resets itself and a service visit is not required. It may take
up to 30 seconds in park and/or several KM of driving to update the DEF
Does DEF Fluid Freeze?
does freeze, at approximately -11 Degrees Celsius. If the DEF is
frozen, the vehicle will start as it always has. After the engine is
started, the DEF Tank and Lines will thaw as they are electrically
heated to ensure adequate DEF delivery in cold weather. The quality of
the DEF does not change if it is frozen and then thawed.
I've heard lots of negative things about the new DEF Exhaust Fluid System in the new GM Diesel Trucks. What has GM changed?
GM has made two calibration changes to the DEF System in response to the issues that developed this winter.
1) The first calibration enhancement was phased in at the end of December 2010. This enhancement extended the heating cycle to defrost the DEF. The original cycle was a 90 minute cycle which has now been increased to a 270 minute cycle.
2) The second calibration enhancement was phased in at the end of January 2011. This enhancement addresses the level of DEF in the system that is associated with reduced performance initiation. The previous program would put the vehicle into reduced power mode due to the system detecting a lack of DEF fluid due to environmental factors.