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:

    Power Mirrors
    Base Model To adjust the mirrors: 1. Press or to select a mirror. 2. Press the control pad to adjust the mirror. 3. Return the switch to the center to deselect the mirror. Uplevel Model T ...

    Tire Rotation and Required Services Every 12 000 km/ 7,500 mi
    Rotate the tires, if recommended for the vehicle, and perform the following services. See Tire Rotation on page 10‑57. ○ Check engine oil level and oil life percentage. If needed, chang ...

    Manual Windows
    Turn the hand crank on each door to manually raise or lower the manual windows. ...