18
Automatic Transmission
Integrated Trailer Brake Control (ITBC)
F
Diesel Exhaust Brake (Diesel Models Only)
Range Selection Mode
Range Selection Mode allows the driver to select
the range of gears desired for the current driving
conditions.
1. Move the shift lever to the Manual (M) position.
2. Press the + (plus) or – (minus) button on the
shift lever to select a lower or higher gear. An
M and the current gear will be displayed on
the Driver Information Center.
The transmission will be limited to the gear selected and lower gears. If vehicle speed is
too high or too low for the requested gear, the shift will not occur.
Tow/Haul Mode
The Tow/Haul Mode adjusts the transmission shifts to reduce shift cycling, such as when
towing or hauling heavy loads or driving on steep grades.
Press the
Tow/Haul Mode button on the end of the shift lever to turn the system
on or off.
See Driving and Operating in your Owner Manual.
The ITBC system can be used to adjust the
amount of power output, or Trailer Gain, avail-
able to the trailer brakes. The control panel is
located on the left side of the instrument panel.
ITBC information is displayed on the Driver
Information Center.
Adjust the Trailer Gain by pressing the +/–
adjustment buttons on the control panel.
Squeeze the levers together on the control panel (left lever does not move) to manual-
ly apply the trailer brakes.
See Driving and Operating in your Owner Manual.
The engine exhaust brake enhances the vehicle
brake system by using engine braking and auto-
matically downshifting the transmission, depend-
ing on the length of time the brakes are applied,
to help slow the vehicle on downhill grades.
Press the
Diesel Exhaust Brake button on
the center of the instrument panel to turn the
system on or off.
See your Duramax Diesel Owner Manual.
F
Optional equipment
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