The contact owned a 2015 Subaru Crosstrek. The contact stated while driving 20-25 MPH and making a left in the roundabout of a residential road, she felt a rear impact and all the air bags deployed. The vehicle then accelerated unintendedly, veered to the right, jumped the curb, and crashed into a tree. The brake pedal was depressed but failed to respond. The contact stated that she sustained significant Hematomas on her left and right calves from the knee air bags deployment. The contact sought medical assistance, A police report was filed. Bystanders informed the contact that the vehicle was not rear-ended; however, the cause of the failure was undetermined. The vehicle was towed to an autobody shop where it was totaled. The dealer was not notified of the failure. The manufacturer was notified of the failure and sent a field investigator who retrieved the EDR. The manufacturer then informed the contact that the vehicle had experienced a rear impact and responded as needed based on the EDR. However, the contact stated upon inspecting the vehicle after the accident, the rear of the vehicle did not display signs of a rear impact. The failure mileage was approximately 28,000.