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 vehicle is equipped with the Tire Pressure Monitoring System. If a diagnostics check is needed between e-mails, push OnStar Additional Information , and an Advisor can run a check.

    See also:

    Exterior Lamp Controls
    Exterior Lamp Controls The exterior lamp control is located on the instrument panel on the outboard side of the steering wheel. Turn the control to the following positions: (Off): Turns of ...

    Finding a Category (CAT) Station (XM™ Satellite Radio Service Only)
    CAT (Category): The radio may have the CAT button feature. To select and find a desired category: 1. Press the BAND button until the XM frequency displays. Press the CAT button to display the c ...

    Additives
    To provide cleaner air, all gasolines in the United States are now required to contain additives that will help prevent engine and fuel system deposits from forming, allowing your emission control ...