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:

    Three-Way Calling
    Three-Way Calling must be supported on the Bluetooth phone and enabled by the wireless service carrier to work. 1. While on a call press . The system responds with “Ready” followed by a ...

    Wiper Activated Headlamps
    This feature activates the headlamps and parking lamps after the windshield wipers are turned on and have completed eight wipe cycles within four minutes. When the ignition is turned to LOCK/OFF, ...

    How to Check Automatic Transmission Fluid (4.6L Engine)
    For the 4.6L V8 engine, it is not necessary to check the transmission fluid level. A transmission fluid leak is the only reason for fluid loss. If a leak occurs, take the vehicle to your dealer/ ...