Diesel Exhaust Fluid - Chevrolet Low Cab Forward 2023 Manual

Prolonged idling may require more frequent
DPF regeneration.
See Driver Information Center (DIC) 0 59 and
Diesel Particulate Filter Light 0 56.

Diesel Exhaust Fluid

Diesel exhaust fluid (DEF) is used exclusively
for the selective catalytic reduction (SCR)
system. Be sure to use only API certified
DEF. When the SCR system detects DEF level
is nearly empty or incorrect fluids (such as
water or low concentrated DEF.) are added,
the SCR system will turn on warning and
indicator lights and reduce engine power in
progressive stages to encourage you to have
the condition corrected. Continuing to drive
for too long after these lights come on will
eventually result in a severe vehicle speed
limitation. See Vehicle Messages 0 62
The DEF freezes below 11 °C (12 °F). The SCR
system is equipped with a heating function
which utilizes the engine coolant, so the
engine can be started even when DEF is
frozen.
Handling of DEF
Use only API certified DEF (or ISO: AUS 32).
DEF is a colorless, transparent solution.
It may smell depending on the conditions,
but this is not abnormal.
DEF is available from your local authorized
dealer. In addition, the U.S. Department
of Energy has created an on-line DEF
locator that can be accessed at
https://www.afdc.energy.gov/afdc/locator/
def/. The American Petroleum Institute (API)
also maintains a list of API-certified
distributors of DEF on its web page at
https://www.apidef.org/searchresults.asp.
Warning
Avoid getting Diesel Exhaust Fluid (DEF)
on your skin or in your eyes as it could
cause irritation. For more safety,
handling, and storage information, see
the Diesel Exhaust Fluid container label.
See Winter Driving 0 119, and Recommended
Fluids and Lubricants 0 285.
Driving and Operating
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).
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