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:

    Horn
    Press near or on the horn symbols on your steering wheel pad to sound the horn. ...

    Service All-Wheel Drive Light
    This light should come on briefly when you turn on the ignition, as a check to show you it is working. The service all-wheel drive light comes on to indicate that there may be a problem with ...

    Environmental Concerns
    Off-road driving can provide wholesome and satisfying recreation. However, it also raises environmental concerns. We recognize these concerns and urge every off-roader to follow these basic rules ...