GMC Yukon Denalid Owner's Manual page 151

Press the button located on the end of the shift
lever to turn the tow/haul on or off. When the
tow/haul is on, a light on the instrument panel
cluster will come on.
See Tow/Haul Mode Light on page 242 for more
information.
Also see "Tow Haul Mode" under Towing a Trailer
on page 400 for more information.
The tow/haul mode works with the Autoride
feature, if the vehicle has this, to enhance the ride
when trailering or with a loaded vehicle. See
®
Autoride on page 399.
Grade Braking
Grade Braking assists when driving on a downhill
grade. It maintains the vehicle's speed by
automatically implementing a shift schedule that
uses the engine and the transmission to slow
the vehicle. This reduces wear on the brakes
system and increases control of the vehicle. The
system constantly monitors the vehicle's speed,
acceleration, throttle position, and whether
®
the brake pedal is being pressed, and determines
when to keep the current vehicle speed or to
slow down. The system will then automatically
command downshifts that reduces the vehicles
speed, until the brake pedal is no longer
being pressed. This indicates the desired vehicle
speed has been reached.
The tow/haul mode and grade braking shift
modes can be activated by pressing the button on
the end of the shift control stalk. While in the
DSC mode, grade braking is deactivated, allowing
the driver to select a gear.
See Automatic Transmission Operation on
page 145 for more information.
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