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:

    Increasing Speed While Using Cruise Control
    If the cruise control system is already activated: • Press and hold the +RES button on the steering wheel until the desired speed is reached, then release it. • To increase vehicle speed in smal ...

    When Should an Airbag Inflate?
    Frontal airbags are designed to inflate in moderate to severe frontal or near frontal crashes to help reduce the potential for severe injuries, mainly to the driver's or front outboard passenger's hea ...

    Hydraulic Power Steering
    Your vehicle has hydraulic power steering. It may require maintenance. See Power Steering Fluid Power Steering Fluid on page 10‑27. If power steering assist is lost because the engine stops or ...