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:

    Vehicle Messages
    Messages are displayed on the DIC to notify the driver that the status of the vehicle has changed and that some action may be needed by the driver to correct the condition. Multiple messages may appe ...

    Lumbar Adjustment
    Power Lumbar Eight-Way Power Seat Shown, Four-Way Similar A. Lumbar Switch If available, press and hold the front or rear of the switch (A) to increase or decrease lumbar support. Release the s ...

    When to Check Power Steering Fluid
    It is not necessary to regularly check power steering fluid unless you suspect there is a leak in the system or you hear an unusual noise. A fluid loss in this system could indicate a problem. Have th ...