1 Unknown. I suspect a malfunction involving the electronic gear-selection/shift-control system or transmission control system. I personally placed the vehicle in Park while the engine was running. After I exited the vehicle and was away from it, the vehicle moved on its own. When I returned after hearing the impact, the gear selector was no longer in Park and was in another position. The vehicle and relevant electronic systems are available for inspection. 2 The vehicle was parked on a steep hill. I had personally placed the vehicle in Park and exited it with my daughter. While I was inside my home, the vehicle moved without my knowledge or intentional input and struck my garage. The vehicle was running and was my spouse was still in the car when the movement occurred. The unexpected movement created a risk of the vehicle striking a person, entering a roadway, or causing a more serious crash or injury. 3 No. The incident has not yet been independently reproduced or confirmed. The vehicle needs to be inspected to determine why it moved after I placed it in Park. 4 No not yet 5 No known warning lamps, messages, or symptoms occurred before the incident. The vehicle appeared to be operating normally. I had no warning that it would leave Park or move