GMC Terrain: Hill Descent Control (HDC) - Ride Control Systems - Driving and OperatingGMC Terrain: Hill Descent Control (HDC)

HDC can be used when driving downhill. It sets and maintains vehicle speed while descending a very steep incline in a forward or reverse gear.

The HDC switch is on the center console.

Press Vehicle speed must be below to enable or disable HDC.
Vehicle speed must be below 50 km/h (31 mph).

The HDC light displays on the


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.

When HDC is activated, the initial HDC speed is set to the current driving speed. It can be increased or decreased by pressing +RES or –SET on the steering wheel or by applying the accelerator or brake pedal. This adjusted speed becomes the new set speed.

HDC will remain enabled between 22 and 60 km/h (14 and 37 mph); however vehicle speed cannot be set or maintained in this range. It will automatically disable if the vehicle speed is above 80 km/h (50 mph) or above 60 km/h (37 mph) for at least 30 seconds. Press Driver Mode Control again to re-enable HDC.


(TCS) / (ESC). Turning the Systems Off and On (Base Level DIC)
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Driver Mode Control
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