GMC SIERRA 2500HD Denali (2015) UM [17/20] Utomati

automatIc transmIssIon

IntegrateD traIler braKe control (Itbc)

Range Selection Mode

Range Selection Mode allows the driver to select the range of gears desired for the current

driving conditions.

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.

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. When towing, use the Tow/Haul

Mode to prevent damage to the engine or transmission.

Press the

Tow/Haul Mode button on the end of the shift lever to turn the system

on or off.

GMC Trailering Guide App

The free trailering guide app includes maximum trailer weight ratings by model along with

trailering information on hitches and equipment, GMC trailering technologies, safe trailering

techniques and more. Currently available for the iPad

, download the mobile app from the

iPad’s app store.

See Driving and Operating in your Owner Manual.

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.