See also:

How to Reset the Engine Oil LifeSystem
The Engine Oil Life System calculates when to change your engine oil and filter based on vehicle use. Anytime your oil is changed, reset the system so it can calculate when the next oil change is ...

Power Door Locks
Power Door Locks (Unlock): Press to unlock all doors. (Lock): Press to lock all doors. See “Power Door Locks” in Vehicle Personalization. ...

Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if ...