NHTSA Complaint #11682839 — 2015 GMC YUKON XL

The contact owns a 2015 GMC Yukon XL. The contact stated that upon starting the vehicle, the transmission shifted hard from first to second gear while depressing the accelerator pedal. There was no warning light illuminated. The contact stated that while driving 80 MPH, the vehicle independently decelerated while depressing the accelerator pedal, and the vehicle started shaking abnormally. The vehicle was taken to an independent and several internal parts of the transmission were replaced, and the Transmission Control Module (TCM) was also replaced; however, the failure persisted. The vehicle was then taken to a dealer, where the contact was informed that the repairs had not addressed the cause of the failure. The contact was informed that the failure was likely related to the transfer case. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 161,000.