Park assist was engaged. The prompt was to pull forward more. Then the park assist prompted to take hands off the steering wheel. The park assist maneuvered backward into parallel parking. Once it made the turn backing in, it sped up backward with no warnings on the camera or auditory alarms, and hit the vehicle parked behind our vehicle. My vehicle is damaged. The other vehicle is not. This is a serious problem. Not only did my vehicle sustain damage, but a person could have been there and it could have caused damage to the other vehicle. This park assist had the driver take the hands off the wheel, gave zero warnings, no visual or auditory, increased rear speed, and hit the vehicle. I want the event data recorder to be reviewed and for my car's fault to be remedied and my vehicle to be repaired.