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:

    Hazard Warning Flashers
    The hazard warning flashers warn others. They also let police know you have a problem. Your front and rear turn signal lamps will flash on and off. The hazard warning flasher button is loca ...

    Units
    Press the customization button until UNITS: U.S. (ENGLISH) appears in the display. To select English or metric, press the select button while UNITS: U.S. (ENGLISH) is displayed on the DIC. Pre ...

    Low-Profile Tires
    If the vehicle has P235/45R18 size tires, they are classified as low-profile tires. Notice: Low-profile tires are more susceptible to damage from road hazards or curb impact than standard profile ...