Chevrolet/GMC 3.0L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13336148) - 2020 - CRC - 9/5/19
Driving and Operating
23
DEF Low
As the DEF level drops, warnings
will automatically be displayed in the
Driver Information Center (DIC).
Select Vehicle Information in the
DIC to view DEF level status. See
Driver Information Center (DIC)
.
Refill the DEF tank at the first
opportunity after a low warning
indication to avoid vehicle speed
limitations.
It may take some time for the
vehicle to detect that DEF has been
added. If there was a vehicle speed
limitation, it will be removed
gradually and it may take several
kilometers/miles for the DIC
message to update.
If DEF is added under freezing
conditions, additional time may be
required to remove speed
limitations.
The DEF range DIC message first
displays at approximately 1 600 km
(1,000 mi). This message appears
again at approximately 500 km
(300 mi) of remaining range before
the exhaust fluid tank becomes
empty.
As the fluid level nears empty, these
messages appear every time the
vehicle is started.
If the DEF low warnings are ignored
and the DEF tank becomes empty,
the DIC will display messages that
describe the action needed and
distance until vehicle speed is
limited. For the DEF warning light
symbol, see
.
DEF Quality Poor
Use only DEF that is GM approved,
or fluid containing the API certified
or ISO 22241 label.
DEF has an expiration date. If the
system detects poor quality,
or contaminated or diluted DEF, a
DIC message will display along with
distance until vehicle speed is
limited.
The speed limitation will occur in a
series of steps with the final speed
limitation being 8 km/h (5 mph)
along with a flashing warning light
and chimes.
Adding fresh DEF to the system
may resolve the problem after
several kilometers/miles of driving,
depending on several factors. If the
DIC message persists, see your
dealer or additional DIC messages
may display.
Service DEF System
If a problem occurs with the DEF
system, a DIC message displays
along with distance until vehicle
speed is limited.
The speed limitation will occur in a
series of steps with the final speed
limitation being 8 km/h (5 mph)
along with a flashing warning light
and chimes.
In some cases, this message will
clear itself, indicating that the DEF
system was able to correct the
condition. If the DIC message