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:

    When It Is Time for New Tires
    Factors such as maintenance, temperatures, driving speeds, vehicle loading, and road conditions affect the wear rate of the tires. Treadwear indicators are one way to tell when it is time for new t ...

    License Plate Lamp
    To replace one of these bulbs, do the following: 1. Remove the two screws holding the license plate lamp lens. 2. Pull the lens away from the lamp assembly. 3. Pull the old bulb from the bulb ...

    Recommended Fluids and Lubricants
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