See also:

OnStar Personal Identification Number (PIN)
A PIN is needed to access some of the OnStar services, like Remote Door Unlock and Stolen Vehicle Assistance. You will be prompted to change the PIN the first time when speaking with an Advisor. To ch ...

Overview
The GMC Sierra All Terrain HD concept is an exploration of heavy-duty truck capability combined with greater off-road versatility. It is highlighted by a bold exterior design, enhanced all-terrain ...

Air Conditioning
(Air Conditioning): Press to turn the air conditioning (A/C) on and off. An indicator light comes on when A/C is on. The A/C does not work when the outside temperature is below 4°C (40°F). If is ...