Chevrolet Low Cab Forward 6.7L 2022 Owner's Manual page 153

152 Driving and Operating
Warning
On occasion, you may notice an odor
when the DEF tank is opened. Do not
sniff the filler port, etc.
When refilling the DEF tank: Failure to
follow the above instructions could result
in a fire or a breakdown of the selective
catalytic reduction (SCR) system.
Do not dilute DEF with water.
Do not add substances such as gasoline
or diesel fuel to the DEF tank. You and
others could be seriously injured.
Caution
When opening the DEF tank cap, be
careful not to let dirt or other foreign
matter enter inside the DEF tank.
Intrusion of foreign matter can cause a
clogging of the filter or affect the quality
of DEF, which may result in a SCR system
failure.
If DEF is spilled on the body or frame, it
may cause generation of rust, so wipe it
off and then rinse it away with water.
The DEF nozzle used to fill the DEF tank
automatically stops pumping DEF once the
fluid reaches the end of the nozzle.
When DEF dries it will leave a crystalline
residue, this condition is normal. Wash with
water or wipe away the residue to prevent
it from entering the DEF tank.
Adding DEF in Cold Weather
In cold weather, do not park the vehicle for
long periods of time if the DEF indicator
light is on. The DEF gauge will not register
correctly should the DEF freeze in this
condition causing the DEF low level warning
system not to reset when DEF is added.
Take the following actions to avoid this
condition in cold weather.
1. Refill the DEF as soon as possible after
parking the vehicle.
2. Turn the engine control switch to the ON
position from the LOCK position.
3. Wait for the warning buzzers and
warning lights to turn off.
4. If the buzzer does not stop, return the
engine control switch back to the LOCK
position and add more DEF, and then
start over from step (2) above.
5. Turn the engine control switch to the
LOCK position.
The DEF freezes at approximately 11 °C
(12 °F).
In cold weather, when the vehicle is left
without performing these actions and the
DEF tank freezes, the low DEF level warnings
and indicators may not turn off when DEF is
added until after the tank defrosts.
Make sure to stop the engine before adding
the DEF. See "Selective Catalytic Reduction
(SCR) System and When the Diesel Exhaust
Fluid (DEF) Tank is Empty later in this
section. See Diesel Exhaust Fluid (DEF)
Warning Light 0 57.
When DEF Freezes
DEF freezes at low temperature but the
engine coolant circulates to thaw the DEF
tank and to prevent DEF from freezing. The
vehicle can be driven normally when DEF is
frozen.
If the DEF indicator light is on and the
remaining DEF in the DEF tank is frozen, the
warning lights, indicator lights and engine
restrictions will not be canceled until the
DEF thaws even if the DEF tank is refilled. To
avoid this condition, follow the instructions
for "Adding DEF in Cold Weather" in this
section.