i was in FSD mode and my car began parallel parking.As the car was in reverse it automatically accelerated and crashed into the car behind me. I did not step on the accelerator pedal, nor the brake and my hands were not on the steering wheel. I in no way caused this accident. What is most surprising is that there was no warning response. Normally if I get too close to any object a color warning shows up on the screen, if I decide to make a change while driving the screen comes up with 4 options as to why I took control but in this case with the car hitting an object there was no response at all.Teslas standard answer is always that it's my fault. I know what happened and it was not my fault.I now have a repair estimate for $1,897.98 which I must be responsible for