See also:

OnStar Overview
If equipped, this vehicle has a comprehensive, in-vehicle system that can connect to a live Advisor for Emergency, Security, Navigation, Connection, and Diagnostic Services. The OnStar system ...

Starting the Engine
If the vehicle is a hybrid, see the hybrid supplement for more information. Move the shift lever to P (Park) or N (Neutral). The engine will not start in any other position. To restart the engine w ...

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 ...