I WAS TRAVELING ON U.S. 30 TO GREENSBURG, PA AND I WENT ON TO THE OFF RAMP ON TO WEST PITTSBURGH STREET AND THE TRACTION CONTROL, STABILITY LIGHTS LIT UP. I LOOK DOWN AT THE DASHBOARD TO SEE WHAT GOING ON. THEN, MY CAR JERKED SUDDENLY BACKWARDS I HIT MY HEAD TWO OR THREE TIMES OFF THE HEAD REST. I HIT THE ON STAR BUTTON TO REPORT WHAT HAS HAPPENED TO VERIFY THE CODES AND TOLD THEM THE SITUATION. THE ON STAR PEOPLE DIDN'T EVEN ASK ME IF I NEEDED MEDICAL ATTENTION. SO, I DROVE TO THE HOSPITAL THAT WAS 1/4 MILE AWAY. I WAS DIAGNOSED WITH A HEAD INJURY AND RECEIVED TREATMENT FOR NECK AND BACK INJURIES. *TR