See also:

How OnStar Service Works
Automatic Crash Response, Emergency Services, Crisis Assist, Stolen Vehicle Assistance, Vehicle Diagnostics, Remote Door Unlock, Roadside Assistance, Turn-by-Turn Navigation, and Hands-Free ...

Safety
Standard safety items include four-wheel-disc antilock brakes and an electronic stability system. The system has rollover mitigation technology that senses imminent rollovers and applies individua ...

Park Brake and P (Park) Mechanism Check
WARNING! When you are doing this check, the vehicle could begin to move. You or others could be injured and property could be damaged. Make sure there is room in front of the vehicle in case ...