Brakes; Exhaust Brake - GMC Duramax Diesel 2015 Owner's Manual

9-20 Driving and Operating
When the mileage countdown is
zero, the DIC message SERVICE
EMISSION SYSTEM - SEE
OWNERS MANUAL NOW -
TRANSITIONING TO 105 KM/H
(65 MPH) MAX SPEED displays.
A chime also comes on. Vehicle
speed will be reduced to a
maximum speed limit of 105 km/h
(65 mph).
After the transition to 105 km/h
(65 mph) is complete, the DIC
message SERVICE EMISSION
SYSTEM - SEE OWNERS
MANUAL NOW - SPEED LIMITED
TO 105 KM/H (65 MPH)
(75 MI) UNTIL 89 KM/H (55 MPH)
MAX SPEED displays. The
displayed mileage will decrease as
driving continues. A chime also
comes on.
When the mileage countdown is
zero, the DIC message SERVICE
EMISSION SYSTEM - SEE
OWNERS MANUAL NOW -
TRANSITIONING TO 89 KM/H
(55 MPH) MAX SPEED displays.
A chime also comes on. Vehicle
speed will be reduced to a
maximum speed limit of 89 km/h
(55 mph).
After the transition to 89 km/h
(55 mph) is complete, the DIC
message SERVICE EMISSION
SYSTEM - SEE OWNERS
MANUAL NOW - SPEED LIMITED
120 KM TO 89 KM/H (55 MPH) displays.
A chime also comes on.

Brakes

Exhaust Brake

The heavy duty diesel pickups have
an exhaust brake to enhance the
vehicle brake system, and reduce
brake lining wear.
A switch is used to activate the
system, and is located below the
climate controls in the center stack.
The switch must be pressed at each
vehicle start for the system to be