NHTSA Complaint #11715829 — 2018 FORD F-150

The contact owns a 2018 Ford F-150. The contact stated that while driving at various speeds, the transmission unexpectedly downshifted before slamming into gear. The vehicle returned to normal functionality, but the failure became a regular occurrence. The check engine warning light was illuminated. The contact stated that on a separate occasion, while driving at an undisclosed speed, there was an abnormal popping sound coming from the transmission. The vehicle was taken to the dealer, where it was diagnosed with transmission failure. The transmission was rebuilt; however, the failure persisted. Most recently, while driving 55 MPH, the check engine warning light illuminated. The contact stated that the transmission downshifted unexpectedly. The vehicle was taken to the dealer; however, no cause for the failure was found. The manufacturer was not contacted. The failure mileage was unknown.