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:

    Horn
    Press on the steering wheel pad to sound the horn. ...

    What to Use
    To determine what kind of fluid to use, see Recommended Fluids and Lubricants on page 11‑12. Always use the proper fluid. Notice: Use of the incorrect fluid may damage the vehicle and the damag ...

    Tire Messages
    SERVICE TIRE MONITOR SYSTEM This message displays if there is a problem with the Tire Pressure Monitor System (TPMS). See Tire Pressure Monitor Operation on page 10‑54 for more information. ...