Hill Descent Control (Hdc) - GMC Sierra Instruction Manual

Caution
Do not repeatedly brake or
accelerate heavily when TCS is
off. The vehicle driveline could be
damaged.
To turn off only TCS, press and
release the button. The traction
off light displays in the instrument
cluster. The appropriate message
will display in the DIC. See Ride
Control System Messages 0 155. To
turn TCS on again, press and
release the button. The traction
off light displayed in the
instrument cluster will turn off.
If TCS is limiting wheel spin when
the button is pressed, the system
will not turn off until the wheels stop
spinning.
To turn off both TCS and StabiliTrak,
press and hold the button until
the traction off light and the
StabiliTrak OFF light come on
and stay on in the instrument
cluster, then release. The
appropriate message will display in
the DIC. See Ride Control System
Messages 0 155.
To turn TCS and StabiliTrak on
again, press and release the
button. The traction off light
the StabiliTrak OFF light
instrument cluster turn off.
StabiliTrak will automatically turn on
if the vehicle exceeds 56 km/h
(35 mph). Traction control will
remain off.
The vehicle has a Trailer Sway
Control (TSC) feature and a Hill
Start Assist (HSA) feature. See
Trailer Sway Control (TSC) 0 347 or
Hill Start Assist (HSA) 0 301.
Adding accessories can affect the
vehicle performance. See
Accessories and Modifications
0 354.
I n f o r ma t i o n P r o v i d e d b y :
Driving and Operating
Hill Descent
Control (HDC)
If equipped, HDC can be used when
driving downhill. It sets and
maintains vehicle speed while
descending a very steep incline in a
and
forward or reverse gear.
in the
The HDC switch is on the center
stack, below the climate controls.
Press to enable or disable HDC.
Vehicle speed must be below
50 km/h (31 mph).
The HDC light displays on the
instrument cluster when enabled.
HDC can maintain vehicle speeds
between 3 and 22 km/h (2 and
14 mph) on an incline greater than
or equal to a 10% grade. A blinking
HDC light indicates the system is
actively applying the brakes to
maintain vehicle speed.
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