The contact owns a 2020 Lincoln Navigator. The contact received notification of NHTSA Campaign Number: 26V402000 (Power Train); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that while driving toward a red light at 10 MPH, the transmission unexpectedly shifted into park(P), causing the contact's chest to strike the steering wheel. The engine then shut off. The vehicle was restarted, and the Hill Assist, Pre-Collision, and another unknown warning light were briefly illuminated before turning off. Additionally, the transmission was slipping while driving. The dealer was made aware of the failure but confirmed that parts were not yet available. The manufacturer was notified of the failure by phone. The failure mileage was approximately 103,000.