WAS STOPPED AT RED LIGHT. DECIDED TO USE BRAKE HOLD FEATURE AND WHEN TRAFFIC STARTED TO MOVE I TAPPED THE GAS PEDAL TO RELEASE THE HOLD. THE VEHICLE ACCELERATED AT AN EXCESSIVE RATE AND I ENDED UP IN THE REAR END OF THE CAR IN FRONT OF ME. AIR BAG SENSOR CAME LOOSE AND WIRE WAS DANGLING AFTER IMPACT AND BAG SENSOR DIDN'T UPLOAD.*DT*JB