TL* THE CONTACT OWNS A 2011 CHEVROLET IMPALA. THE CONTACT STATED WHILE DRIVING AT AN UNKNOWN SPEED, THE REAR DEFOGGER FAILED TO OPERATE BLOCKING THE CONTACT'S VISIBILITY. THE CONTACT MENTIONED THAT SMOKE STARTED TO EMIT FROM THE REAR OF THE VEHICLE. THE VEHICLE WAS NOT TAKEN TO THE DEALER. THE FAILURE RECURRED MULTIPLE TIMES. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE APPROXIMATE FAILURE MILEAGE WAS 45,000.