GMC SIERRA 2500HD (2015) UM [18/20] Diesel models onl

automatIc transmIssIon

IntegrateD traIler braKe control (Itbc)

DIesel exHaust braKe (Diesel Models Only)

F Optional equipment

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, available

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.

Slide the lever to the left on the control panel to manually 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, depending

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.