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:

    Brake System Messages
    BRAKE FLUID LOW This message is displayed when the brake fluid level is low. See Brake Fluid . PRESS BRAKE PEDAL TO RELEASE PARK BRAKE This message is displayed if you attempt to release the elec ...

    Driving with a Trailer
    CAUTION: If you have a rear-most window open and you pull a trailer with your vehicle, carbon monoxide (CO) could come into your vehicle. You cannot see or smell CO. It can cause unconsciousn ...

    Storing a Flat or Spare Tire and Tools
    WARNING Storing a jack, a tire, or other equipment in the passenger compartment of the vehicle could cause injury. In a sudden stop or collision, loose equipment could strike someone. Store all th ...