The contact owns a 2021 Honda Pilot. The contact stated that while the engine was idling and with the gear shifter in the park position, the contact reached into the vehicle from the front driver's door, and suddenly the vehicle began to slowly roll backwards. The contact was pushed to the ground, causing the front driver's side wheel to roll over the contact's right leg. The vehicle continued to roll backwards before making a U-turn and then rolling forward down the inclined street and increasing speed. To avoid having the vehicle roll down hill into a crowded street with pedestrians, the front passenger inside the vehicle turned the steering wheel, causing the vehicle to crash into the rear of another parked vehicle. During the incident, the contact suffered an injured right leg and was transported to the hospital. A police report was taken at the scene, and the vehicle was towed away. The both air bags had deployed, and the vehicle was destroyed. The contact indicated that during the incident, the emergency brake was not activated. The cause of the failure was not determined. The manufacturer and local dealer were not notified of the incident. The failure mileage was 20,000.