The contact owns a 2018 Ford F-150. The contact stated while driving 40 MPH, the gear shifter engaged independently. No warning light was illuminated. The dealer was contacted. The first time the failure had occurred the failure persisted. The vehicle was taken to the dealer where it was diagnosed that the PCM software needed to be updated and the transmission needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure but offered no assistance. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The approximate failure mileage was 150,000.