The contact owns a 2020 Ford Escape. The contact stated that while driving at various speeds, there was an abnormal knocking sound coming from underneath the rear of the vehicle. No warning light was illuminated. The vehicle was taken to a local Pep Boys; however, the cause of the failure was not identified. The contact stated that after the attempted diagnostic test, while driving at undisclosed speeds, the vehicle independently swerved in various directions and hesitated while accelerating with the accelerator pedal depressed. The local dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 78,000.