The contact owns a 2022 Toyota Highlander. The contact stated that while her partner was reversing out of a driveway, the vehicle independently surged backward up a hill as her partner applied the brake pedal. Her partner was able to place the vehicle into drive which sent the vehicle forward. The vehicle hit a tree which stopped the acceleration. The contact heard screaming from inside her home and called 911 for assistance. The air bags did not deploy. Her partner was taken to the hospital for an examination and suffered no injuries. A police report was not filed. No property damage was reported. The dealer and the manufacturer were both notified about the failure, the vehicle was towed to the dealer for an impending investigation. The vehicle had yet to be repaired. The failure mileage was unknown.