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:

    Insuring the Vehicle
    Protect your investment in the GM vehicle with comprehensive and collision insurance coverage. There are significant differences in the quality of coverage afforded by various insurance poli ...

    High-Beam On Light
    The high-beam on light comes on when the high-beam headlamps are in use. See Headlamp High/Low-Beam Changer  for more information. ...

    Removing the Spare Tire and Tools
    The equipment you need is located in the trunk. 1. Open the trunk. 2. Remove the spare tire cover. 3. Turn the retainer nut counterclockwise and remove the spare tire. 4. Place the spare t ...