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:

    Filling a Portable Fuel Container
    WARNING Never fill a portable fuel container while it is in the vehicle. Static electricity discharge from the container can ignite the fuel vapor. You can be badly burned and the vehicle damaged if ...

    Automatic Headlamp System
    When it is dark enough outside, the headlamps come on automatically. Do not cover the light sensor on top of the instrument panel or the headlamps will come on when they are not needed. The syst ...

    Replacing Airbag System Parts after a Crash
    WARNING A crash can damage the airbag systems in the vehicle. A damaged airbag system may not work properly and may not protect you and your passenger(s) in a crash, resulting in serious injury or e ...