DRIVE TRAIN, TRANSMISSION ISSUE. CAR WAS RUNNING, IN PARK. I GOT OUT TO PICK UP A FLYER FROM YARD. CAR ACCELERATED AND DROVE THROUGH GARAGE DOOR, AND CRASHED INTO THE BACK WALL OF GARAGE. NO ONE HAS INSPECTED THE CAR, AS IT HAPPENED LATE YESTERDAY. WILL CONTACT DEALERSHIP TODAY. NO SYMPTOMS PRIOR.