See also:

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 the v ...

Services Not Included in Roadside Assistance
Roadside Assistance does not cover or reimburse services for the following: Events caused by fraud or bad faith by the driver. Vehicle immobilization situations due to a major force or unforesee ...

Engine Oil Life System
The engine oil life system calculates engine oil life based on vehicle use and displays the CHANGE ENGINE OIL SOON message when it is time to change the engine oil and filter. The oil life sy ...