In Brief 1-5
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
fuelling stations or retailers may
also 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
you in contacting a GM dealer.
See Recommended Fluids and
Lubricants on page 11‑8.
As the DEF tank becomes low
on fluid, warnings begin with
approximately 1600 km (1000 miles)
of remaining range. These warnings
will increase in intensity as the tank
becomes empty. Once the tank is
empty, the vehicle will be speed
limited to 89 km/h (55 mph) and
eventually to 7km/h (4 mph).
The tank should be refilled to
avoid vehicle speed limitation.
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). The vehicle will have 322 km
(200 miles) before being speed
limited to 89 km/h (55 mph). If the
vehicle continues to be driven in this
condition, it will become speed
limited to 7km/h (4 mph). See Diesel
Exhaust Fluid on page 9‑12.
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