Chevrolet Low Cab Forward 6.7L Diesel Engine 6500XD (GMNA-Localizing-
U.S.-15749874) - 2022 - CRC - 12/1/21
Driving and Operating
151
Adding DEF Before Driving the Vehicle
Add DEF regularly to maintain an adequate
supply. If the DEF level becomes too low the
DEF low level warning system may activate.
The vehicle speed will be severely limited
when the DEF tank is empty.
Be sure to follow these instructions when
refilling the DEF tank.
.
Shut down the engine before adding DEF.
.
When filling, place the nozzle deeply into
the DEF tank. If you try to fill more DEF
by pulling out the nozzle from the DEF
tank, DEF may spill out. Do not allow the
fill level to come within 25 mm (1 in) of
the fill port. This will cause an overfill
condition.
.
Follow all cautions posted in filling
stations.
.
If DEF is spilled, wash it away with water
and wipe the area clean.
.
Add API certified DEF only (or ISO: AUS
32). Do not fill the DEF tank with any
substance other than the DEF.
.
Any substance other than the DEF may
cause a breakdown to the SCR system.
.
Use the DEF handling equipment made of
correct materials (Polyethylene or
Stainless-steel).
.
Avoid contamination from using dirty
funnel for filling.
.
If a fluid other than the specified DEF is
mistakenly added, incorrect fluid may
cause a failure. Have it inspected and
serviced at a dealer immediately.
.
Ammonia odor may be generated when
the DEF is exposed to high temperature.
.
Do not overfill the DEF tank. If the DEF
tank is overfilled, DEF may leak from the
breather hose while driving. Also, if you
overfill the DEF tank in cold weather, the
DEF may freeze and damage the DEF tank
and/or its sensors.
.
Do not put your feet on or stand on the
DEF tank. The tank, pipe or sensors may
be damaged.
.
After stopping the engine, a flow sound
may be heard from the DEF tank or DEF
supply pump. This sound occurs as the
DEF in the piping is returning to the tank,
and does not indicate an abnormality.
See
“
Selective Catalytic Reduction (SCR)
System
”
,
“
Adding DEF in Cold Weather
”
,
When DEF Freezes
”
, and
“
When the Diesel
Exhaust Fluid (DEF) Tank is Empty
”
later in
this section. See
.
Adding DEF
1. Turn the engine control switch to the
ACC or LOCK position and make sure to
stop the engine.
2. Wipe off dust or dirt from around the
filler port of the DEF tank.
3. Turn and remove the filler cap.
4. Insert the DEF nozzle into the tank and
refill until the DEF nozzle automatically
shuts off. If the nozzle shut off is not
functional, stop refilling when the DEF is
approximately 25 mm (1 in) below
bottom of the filler port.
5. Tighten the cap after refilling is
completed.
6. Wipe off DEF that is spilled at refilling.