Transmission Not Go Into Gear problems of the 2016 Honda Civic

The contact owns a 2016 Honda Civic. While the vehicle was parked and turned off, the vehicle rolled backwards down an incline into a parking lot, and crashed into another vehicle. The contact checked the vehicle and noticed that the gear shifter was in the drive position. There were no injuries and a police report was not filed. The vehicle was towed to a local dealer (germain Honda of ann arbor, 2601 s state st, ann arbor, mi 48104) where it was diagnosed that the vehicle was working as intended. The vehicle was not repaired. The manufacturer was not notified. The failure mileage was 30,473.