I WAS PARKED IN A RESIDENTIAL DRIVEWAY AND OPENED THE REAR LIFTGATE TO REMOVE MY SON'S HOCKEY BAG FROM THE BACK. I WAS LEANING IN PRETTY FAR BECAUSE THE BAG HAD SLID TOWARD THE BACKSEAT, WHEN THE LIFTGATE CLOSED ON ITS OWN. I HAD NOT PRESSED ANY BUTTONS, NO ONE ELSE WAS IN THE VEHICLE OR AROUND. THE LIFTGATE HIT ME IN THE BACK AND PUSHED ME FORWARD AS IT CONTINUED TO CLOSE. I WAS PINNED (WITH HALF OF MY BODY IN THE CAR AND HALF OUT OF THE CAR) AND THE DOOR WAS CONTINUING TO CLOSE. MY LEFT ARM WAS STUCK UNDER ME. I WAS EVENTUALLY ABLE TO TURN SLIGHTLY AND USED MY RIGHT ARM AND RIGHT HIP TO TRY TO OPN THE HATCH. IT DID EVENTUALLY START TO OPEN. I WAS RELIEVED AND TOOK A DEEP BREATH AND THEN STARTED TO RETRIEVE THE HOCKEY BACK WHEN I REALIZED IT HAD CLOSED AGAIN. THIS TIME WAS EVEN WORSE AS I WAS COMPLETELY PINNED. I TRIED TO ROTATE AND USE MY RIGHT HIP AGAIN. I HONESTLY THOUGH MY CAR WAS GOING TO KILL ME. THE DOOR DID EVENTUALLY OPEN AGAIN AND THAT TIME I IMMEDIATELY GOT OUT OF THE CAR. I WATCHED AS THE HATCH OPENED AND THEN IMMEDIATELY CLOSED AGAIN. (THANKFULLY, WITHOUT ME IN IT THIS TIME.) I IMMEDIATELY CALLED MY DEALERSHIP. THEY MADE AN APPOINTMENT FOR ME IN ONE WEEK, SO I DID NOT USE THE HATCH AGAIN. I ALSO CALLED GM CUSTOMER SERVICE AS I WAS VERY CONCERNED THAT THIS COULD KILL SOMEONE. THE AGENT SAID SHE HAD NEVER HEARD OF THIS HAPPENING. I LATER FOUND OUT THAT THIS HAS HAPPENED FREQUENTLY AND THAT THE RIGHT STRUT IN MY LIFTGATE WOULD BE THE PROBLEM. SUR