WHILE VISITING A FUNERAL HOME IN MELROSE, MA., I NEEDED TO BACK INTO A SPOT TO BE ABLE TO TAKE PART IN THE FUNERAL PROCESSION. I PULLED OUT OF THE SPOT I WAS IN AND PROCEEDED TO PUT THE CAR IN REVERSE TO BACK INTO THE SAME PARKING SPOT. AT THE SAME MOMENT THAT I STARTED TO BACK IN THE CAR SURGED AND MADE AN ARC IN THE PARKING LOT ONLY STOPPING AFTER I HIT A PARKED CAR WITH SUCH FORCE THAT IT CAUSED TWO MORE CARS TO BE HIT BY THE IMPACT. I ATTEMPTED TO STOP THE CAR BY STEPPING ON THE BREAK WHICH HAD NO EFFECT AND EVEN THOUGH I WASN'T HURT, MY ARMS ACHED FOR DAYS BECAUSE I WAS TRYING TO CONTROL THE WHEEL TO NO AVAIL. I HAVE A CLEAN DRIVING RECORD AND WAS IN REVERSE AT THE TIME WHICH MEANT I HAD MY FOOT ON THE GAS TO BACK IN SLOWLY. I HAVE REQUESTED THAT TESLA CHECK THE THE COMPUTER TO SEE IF I AM OF FAULT OR NOT AND THEY HAVE REFUSED. MY TESLA IS BEING REPAIRED AND I NEED TO KNOW IF THIS WAS A TECHNICAL ERROR . I WAS TOLD IT COULD BE THE AUTO PILOT SYSTEM THAT COULD BE A FAULT EVEN THOUGH I HAVE NEVER USED IT. PLEASE HELP BECAUSE I AM CONCERNED THAT WE SHOULD BE AWARE OF HOW THIS HAPPENED.