GMC 2013 Sierra Denali Owner's Manual page 278

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How well the cruise control works
on hills depends on the vehicle
speed, the load, and the steepness
of the hills. When going up steep
hills, pressing the accelerator pedal
may be necessary to maintain
vehicle speed. When going
downhill, Cruise Grade Braking
helps maintain the driver selected
speed.
Cruise Grade Braking is enabled
when the vehicle is started and
Cruise Control is active. It is not
enabled in Range Selection Mode.
It assists in maintaining driver
selected speed when driving on
downhill grades by using the engine
and transmission to slow the
vehicle.
To disable and enable Cruise Grade
Braking for the current ignition key
cycle, press and hold the Tow/Haul
button for three seconds. A DIC
message displays. See
.
Vehicles with a diesel engine have
Cruise Grade Braking enabled when
Tow/Haul Mode is on, the exhaust
brake is on, or both are on.
For other forms of Grade Braking,
see
and
.
There are three ways to end cruise
control:
To disengage cruise control;
step lightly on the brake pedal.
Press
on the steering wheel.
To turn off the cruise control,
press
on the steering wheel.
The cruise control set speed is
erased from memory by pressing
the
button or if the ignition is
turned off.
If available, the Ultrasonic Rear
Parking Assist (URPA) system
assists the driver with parking and
avoiding objects while in
R (Reverse). URPA operates at
speeds less than 8 km/h (5 mph).
The sensors on the rear bumper
detect objects up to 2.5 m (8 ft)
behind the vehicle, and at least
25 cm (10 in) off the ground.
The URPA system does not
detect children, pedestrians,
bicyclists, animals, or objects
below the bumper or that are too
close or too far from the vehicle.
It is not available at speeds
greater than 8 km/h (5 mph). To
prevent injury, death, or vehicle
(Continued)

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