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 to Check
    Check the tires once a month or more. Do not forget the spare tire, if the vehicle has one. SeeFull-Size Spare Tire on page 10‑91 for additional information. ...

    Battery
    The battery supplies power to start the engine and operate any additional electrical accessories. • To avoid break-down or failure to start the vehicle, maintain a battery with full cranking power. ...

    Weight-Distributing Hitches and Weight Carrying Hitches
    A. Body-to-Ground Distance B. Front of Vehicle When using a weight-distributing hitch, the hitch must be adjusted so that the distance (A) remains the same both before and after coupling the trail ...