CAUSE UNKNOWN. THE VEHICLE WAS STOPPED JUST BEFORE ENTERING INTO A HEAD IN PARKING SPACE WHEN WITH THE BRAKE DEPRESSED, THE VEHICLE ACCELERATED SUDDENLY AND UNCONTROLLABLY CAUSING IT TO JUMP THE CURB AND TAKE DOWN A RETAINING WALL. IT CONTINUED THROUGH THE WALL UNTIL IT WAS STOPPED BY A TREE. VEHICLE WAS A TOTAL LOSS. VEHICLE SETTINGS AT THE TIME OF INCIDENT WERE AS FOLLOWS: THERE IS NO AUTOPILOT ON THIS MODEL S AND CRUISE CONTROL WAS OFF. ADDITIONALLY, THE CAR WAS SET WITH CREEP MODE OFF. HVAC WAS ON.