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:

    SERVICE PARKING BRAKE
    This message is displayed when there is a problem with the electric parking brake. See Parking Brake for more information. Take the vehicle to your dealer. ...

    Lap-Shoulder Belt
    All seating positions in the vehicle have a lap-shoulder belt. The following instructions explain how to wear a lap-shoulder belt properly. 1. Adjust the seat, if the seat is adjustable, so ...

    California Fuel
    If your vehicle is certified to meet California Emissions Standards, it is designed to operate on fuels that meet California specifications. See the underhood emission control label. If this f ...