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:

    Dome Lamps
    The dome lamp controls are located in the overhead console. (Dome Lamp Override): Press to turn the lamps off, even when a door is open. (Door): Press to turn the lamps on automatically when ...

    Different Size Tires and Wheels
    If wheels or tires are installed that are a different size than the original equipment wheels and tires, vehicle performance, including its braking, ride and handling characteristics, stability, and r ...

    If Steam Is Coming From The Engine Compartment
    WARNING: Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Turn it off and get everyone away ...