NHTSA Complaint #10459808 — 2012 CHEVROLET SONIC

THE STEERING WHEEL STARTED "HUNTING" (SHAKING LEFT AND RIGHT) AND RESISTED ATTEMPTS TO STEER THE VEHICLE. ALTHOUGH THE CAR WAS STILL CONTROLLABLE, IT WAS DIFFICULT TO HANDLE. THIS HAPPENS BOTH WHILE STOPPED AND WHILE DRIVING. THE PROBLEM IS INTERMITTENT AND IS NOT THERMAL (WILL HAPPEN BOTH AT COLD START-UP AND WHEN VEHICLE IS UP TO OPERATING TEMPERATURE. IT IS NOT EFFECTED BY AMBIENT TEMPERATURE). THE DEALER REPROGRAMMED THE ELECTRONIC BRAKE CONTROL MODULE WITH SPS 155 WT40, STATING THE CURRENT PROGRAMMING WAS INCORRECT. THE INVOICE REPORTED A CODE: "C0710 SYMPTOM 4B SENSOR NOT LEARNED RELEARN STEERING SENSOR". THE PROBLEM RETURNED AFTER APPROX 100 MILES OF USE. ADDITIONALLY, ONSTAR NOTIFIED ME (APPROX 25 MAY 2012) THAT THE BACKUP BATTERY FOR ITS SYSTEM WAS FAULTY AND REQUIRED IMMEDIATE SERVICE. I MENTION THIS BECAUSE I DO NOT KNOW IF THE BACKUP BATTERY FOR ONSTAR IS COMMON TO ANY BACKUP SYSTEMS FOR THE SONIC'S COMPUTERS. I AM RETURNING THE VEHICLE TO THE DEALER FOR ADDITIONAL INVESTIGATION AND SERVICE. *TR