Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-16504481) - 2023 - CRC - 9/26/22
22 Driving and Operating
Service Emission System
If a problem occurs with the vehicle
emission 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 of 88 km/h (55 mph) and chimes.
In some cases, this message will clear itself,
indicating that the emission system was
able to correct the condition. If the DIC
message persists, see your dealer or
additional DIC messages may display.
Brakes
Exhaust Brake
The exhaust brake can be used to enhance
the vehicle brake system and reduce brake
lining wear.
Downshifts may be automatically selected
to increase engine speed, which increases
the effectiveness of the exhaust brake. The
number of downshifts selected is
determined by the length of time the brakes
are applied and the rate the vehicle is
slowing. The system delivers the correct
amount of braking to assist in vehicle
control. The heavier the vehicle load, the
more active the engine exhaust brake will
be. Use of the exhaust brake will help
maintain vehicle speed when used with
cruise control. See “Cruise Control” in the
owner’s manual.
There still may be occasions when the brake
pedal will need to be used to maintain
vehicle speed.
Automatic downshifts will not occur if the
vehicle is in Range Selection Mode. See
“Manual Mode” in the owner’s manual.
The exhaust brake only activates when the
transmission torque converter is locked. This
can vary based on vehicle speed, gear,
and load.
To activate the system, press EXHAUST
BRAKE
q on the center stack.
A light in the switch will come on when the
exhaust brake is activated. The switch must
be pressed at each vehicle start for the
system to be active.
The Driver Information Center (DIC) displays
the message EXHAUST BRAKE ON for
approximately three seconds, then clears.
To turn the brake off, press the exhaust
brake switch a second time. The DIC displays
the message EXHAUST BRAKE OFF for
approximately three seconds, then clears.
The exhaust brake will be more active when
in Tow/Haul Mode.
Fuel
Top Tier Fuel
GM recommends the use of TOP TIER Diesel
Fuel to keep the engine clean, reduce engine
deposits, and maintain optimal vehicle
performance. Look for the TOP TIER Logo or
see www.toptiergas.com for a list of TOP
TIER Diesel Fuel marketers and applicable
countries.
To Next Page
Loading...
Need help?
General
