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:

    Automatic Transmission
    The shift lever is located on the center console between the front seats. There are several different positions for the shift lever. P (Park): This position locks the rear wheels. Use this ...

    Checking Engine Oil
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