Driving and Operating 9-13
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.
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,
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
3.78 liters (one gallon) of fluid to
release the vehicle from speed
limitation.
Do not over fill the DEF tank.
When fluid reaches the top of the
fill pipe, stop filling. Do not top off
the DEF tank.
If you spill DEF on the vehicle while
filling the tank, wipe the surface with
a damp cloth.
DEF Fill ‐ Vans
For vans, the DEF fill is located
behind the fuel fill door. The DEF
cap is blue, and diesel cap is green.
Fill tube location for chassis‐cab
and cutaway vans finished by an
upfitter will vary. Check the upfitters
manual.
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