The contact owns a 2020 Subaru Outback. The contact stated that while driving in reverse the vehicle crashed into a metal dumpster causing severe damage to the rear end of the vehicle. During the incident, the audible backover prevention alert indicating that the vehicle was nearing an object did not activate causing the vehicle to be driven into the dumpster. During the incident, the front passenger sustained neck and back injuries that later required medical treatment. No police report was taken and the vehicle was driven from the scene. The cause of the failure was not determined. The manufacturer and local dealer were not notified of the failure. The failure mileage was 13,000.