Traveling at roughly 55mph the vehicle started beeping. the car controls began to become hard to steer and without warning the speed in seconds slowed to 15-20 mph. the dash starts reporting the following information:engine power reduces service stabilitrak traction control off i pull over shut off the car and eventually the dealer says it will go away. its a non issue. then it happens again and again over and over again. the code every time is p2138. the service department even thinks an existing tsb is the issue 11273 but since my car isnt listed on it. *tr