Chevrolet Silverado 4500HD 2022 Manual page 211

210 Driving and Operating
See Exhaust Fluid Level in Driver
Information Center (DIC) (Base Level) 0 86 or
Driver Information Center (DIC) (Uplevel)
0 87.
To avoid vehicle speed limitations, fill the
DEF tank at the first opportunity after a low
fluid level warning. If DEF is added before
the EXHAUST FLUID EMPTY REFILL NOW
message appears, it may take several km/mi
for the DIC message to update.
If vehicle speed has been limited and DEF
has been added, it may take up to
30 seconds after engine start with the
vehicle stopped for the refill message to
clear. If the vehicle is driven before the DIC
message clears, vehicle speed will still be
limited. If the DIC message clears while
driving, the speed limitation will be removed
gradually.
If DEF is added under freezing conditions,
additional time may be required to remove
speed limitations, and it may require less
fluid to fill the DEF tank.
Based on driving conditions and vehicle
configuration, the amount needed to fill the
tank will vary. As the fluid level nears
empty, these messages will appear every
time the vehicle is started.
If these warnings are ignored and the DEF
tank becomes empty, the DIC will indicate
the action needed and 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) accompanied by a flashing
warning light and chimes. It is
recommended to fully fill the DEF tank, but
at least 7.6 L (2 gal) of DEF must be added
to release the vehicle from the speed
limitation. See Capacities and Specifications
0 371, Diesel Exhaust Fluid (DEF) Warning
Light 0 84, and Recommended Fluids and
Lubricants 0 363.
Exhaust Fluid 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, the DIC will display EXHAUST
FLUID QUALITY POOR - SEE OWNERS
MANUAL NOW and will show the 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) accompanied by a flashing
warning light and chimes.
Adding fresh DEF to the system may resolve
the problem, depending on several factors.
If the message persists, see your dealer or
additional DIC messages may display.
Service Exhaust Fluid System
If a problem occurs with the DEF system,
the DIC message SERVICE EXHAUST FLUID
SYSTEM - SEE OWNERS MANUAL NOW
displays and will show the 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) accompanied by 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 message
persists, see your dealer or additional DIC
messages may display.