Chevrolet GMC 6.6L Duramax Diesel 2020 User Manual

Chevrolet/GMC 6.6L Duramax Diesel Engine Supplement (GMNA-Localizing-
U.S./Canada-13337828) - 2020 - CRC - 4/17/19
Driving and Operating 29
persists, see your dealer or
additional DIC messages may
display.
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.
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.

Chevrolet GMC 6.6L Duramax Diesel 2020 Specifications

General

Brand	Chevrolet
Model	GMC 6.6L Duramax Diesel 2020
Category	Engine
Language	English