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:

    Tire Pressure Light
    For vehicles with the Tire Pressure Monitor System (TPMS), this light comes on briefly when the engine is started. It provides information about tire pressures and the TPMS. When the Light Is On St ...

    Control of a Vehicle
    Braking, steering, and accelerating are important factors in helping to control a vehicle while driving. ...

    Hitches
    Use the correct hitch equipment. See your dealer or a hitch dealer for assistance. ○ The rear bumper on the vehicle is not intended for hitches. Do not attach rental hitches or other bumper-t ...