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:

    Hydraulic Power Steering
    Your vehicle has hydraulic power steering. It may require maintenance. See Power Steering Fluid Power Steering Fluid on page 10‑27. If power steering assist is lost because the engine stops or ...

    When the System Does Not Seem to Work Properly
    The following messages may be displayed on the DIC: SERVICE PARK ASSIST: If this message occurs, take the vehicle to your dealer to repair the system. PARK ASST BLOCKED SEE OWNERS MANUAL: This messa ...

    Voice Recognition
    The Bluetooth system uses voice recognition to interpret voice commands to dial phone numbers and name tags. For additional information, say “Help” while you are in a voice recognition menu. Noi ...