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:

    Off-Road Recovery
    The vehicle’s right wheels can drop off the edge of a road onto the shoulder while driving. If the level of the shoulder is only slightly below the pavement, recovery should be fairly easy. E ...

    Steering in Emergencies
    There are times when steering can be more effective than braking. For example, you come over a hill and find a truck stopped in your lane, or a car suddenly pulls out from nowhere, or a child darts o ...

    Fog Lamps
    The fog lamps button is on the exterior lamps control to the left of the steering column. (Fog Lamps): Press the exterior lamps button to turn the fog lamps on or off. A light comes on in th ...