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 an Advisor can run a check., and an Advisor can run a check.

    See also:

    Reducing Speed While Using Cruise Control
    If the cruise control system is already activated: - Press and hold the −SET button on the steering wheel until the desired speed is reached, then release it. - To slow down in small a ...

    Replacing Brake System Parts
    The braking system on a vehicle is complex. Its many parts have to be of top quality and work well together if the vehicle is to have really good braking. The vehicle was designed and tested with ...

    Shutting the Engine Off After a Remote Start
    To manually shut off the engine after a remote start, do any of the following: - Press until the parking lamps turn off. - Turn on the hazard warning flashers. - Turn the ignition switch o ...