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:

    Call Waiting
    Call waiting must be supported on the Bluetooth phone and enabled by the wireless service carrier to work. • Press to answer an incoming call when another call is active. The original call i ...

    Reducing Speed While Using Cruise Control
    To reduce your speed while using cruise control: • Press and hold the SET– button on the steering wheel until the desired lower speed is reached, then release it. • To slow down in very sm ...

    Potential Issues
    Some OnStar services are disabled after five days. OnStar cannot perform Remote Door Unlock or Stolen Vehicle Assistance after the vehicle has been off continuously for five days. After five ...