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:

    Engine Exhaust
    WARNING Engine exhaust contains carbon monoxide (CO) which cannot be seen or smelled. Exposure to CO can cause unconsciousness and even death. Exhaust may enter the vehicle if: • The vehicle idle ...

    Front Fog Lamp Light
    The front fog lamp light comes on when the fog lamps are in use. The light goes out when the fog lamps are turned off. See Fog Lamps on page 6‑4 for more information. ...

    Vehicle Symbol Chart
    Here are some additional symbols that may be found on the vehicle and what they mean. For more information on the symbol, refer to the Index. Airbag Readiness Light Air Conditioning ...