Today out of of the blue my car was making this strange noise. It seemed to be coming from behind the dash and it was a high pitched "squeaky" sound. It only happened when the car was in motion and it got more frequent as I drove home. I went out later and upon starting the car I received my "Chassis warning" alert " Service required"...Squeaky sound was gone and my Active Chassis '4C' buttons are no longer lit. <p>What is the deal?