2021 Ford Expedition power train problems

“While driving at highway speeds, specifically during sudden acceleration and lane-change maneuvers, the vehicle experiences a severe dynamic mechanical binding event. The transmission briefly forces a sudden "halt" or engine-braking downshift, causing the vehicle to unexpectedly slow down in active traffic before entering a temporary limp mode. This sudden loss of propulsion and unexpected deceleration creates an immediate rear-end collision hazard on the highway. This happened to my wife while merging onto a highway almost causing an accident. Diagnostic and Mechanical Verification: The vehicle was taken to an authorized Ford dealership for evaluation. The dealership officially scanned, verified, and documented diagnostic trouble code P0786 (Shift Timing Solenoid "A" Range/Performance). Following an advanced diagnostic review, the certified Ford technician officially diagnosed a failed transmission park solenoid (parking pawl solenoid). Direct Relation to Active Safety Recall: The component failure (park solenoid), diagnostic code (P0786), and severe dynamic highway-speed binding symptoms are identical to the safety defects outlined in Ford Safety Recall 26S48…”

“My 2021 Ford Expedition MAX XLT with the 10R80 automatic transmission has experienced repeated momentary “neutral-out” events while driving. The transmission/park-system components are available for inspection upon request. The most serious incident occurred in September 2026 while I was driving at highway speed near Charlottesville, Virginia, with six children in the vehicle. I was not towing or placing the vehicle under unusual load. The vehicle suddenly behaved as though the transmission had shifted into neutral, the RPM/engagement became abnormal, I heard loud thumping, saw smoke or fumes from the rear of the vehicle, and observed a transmission temperature of 261°F. The vehicle later re-engaged. This created a serious safety concern because I temporarily lost normal propulsion/acceleration capability while traveling at highway speed with other traffic. This problem has previously been confirmed by my Ford dealer. In February 2026, I reported that the vehicle would “neutral out and rev up,” hesitate for several seconds, and then go back into gear. The dealer documented that no diagnostic codes were stored but followed Ford TSB 23-2249. During diagnosis, the…”

“Vehicle has 84,000 miles at it. It started to jerk when putting it into a gear. I thought it was due to the colder mornings no. I was taking the kids to school and It was skipping gears. I was very leary of driving but had no choice. It would not get up to speed the rpms was suffering. I stopped at a parts store to run the code after the warning popped up. When leaving because I was 30 mins from home it jerked when I placed into gear, I was scared to pull onto the 4 lane due to not being able to get up to speed and being in a high traffice area. Very unsafe. Now the vehicle is at the dealership needing a $7,000 transmission and ford will not assist. I am still financing it through a dealer and there is no Goodwill from Ford. This is known issue that they documented.”

“VIN):[XXX]/Make/Model: 2021 Ford Expedition XLTCurrent Mileage: Approx. 150,000 milesLocation: [XXX] of the Safety Defect:El vehículo presenta un defecto de seguridad crítico y extremo en el tren motriz que pone en riesgo inminente la vida de los ocupantes y de terceros en la vía pública. En dos ocasiones distintas durante los últimos 15 días, el vehículo ha sufrido una pérdida total de comunicación electrónica y un bloqueo mecánico absoluto mientras se encontraba en plena marcha en avenidas de [XXX].Al ocurrir la falla, el tablero activa de inmediato la luz de la llave inglesa (Wrench Light), descontrola la marcha, bloquea la transmisión de 10 velocidades y activa de manera imprevista y automática el freno de emergencia electrónico, deteniendo el vehículo por completo en medio del tráfico.En el primer incidente (ocurrido en sábado), la gravedad del bloqueo mecánico obligó la intervención de los servicios de emergencia en la vía pública, requiriendo la asistencia de la policía y el cuerpo de bomberos para mover el vehículo a una zona segura. El sistema electrónico sufre un colapso total (cortocircuito térmico o fallo de la red CAN Bus) provocado por las…”

“While trying to pull out of a residential neighborhood onto a state highway (45 mph speed limit), the vehicle refused to accelerate. The transmission couldn't engage into gear and the vehicle struggled to gain momentum. After letting off of the accelerator pedal, and then applying the accelerator again, the transmission was able to engage, and the car began to accelerate. No check engine light or other indication of a problem. The Ford dealer told us that the CDF drum of the transmission needed to be replaced. It is a known defect due to poor engineering design. This is very common problem in 2020 and 2021 Expeditions and F150 vehicle.”

“My Ford Expedition’s 10-speed automatic transmission experienced repeated slipping and sudden loss of propulsion. While accelerating from a stop and entering the highway, typically around 15–20 MPH, the engine would suddenly rev but the vehicle would stop accelerating, as if the transmission had shifted into neutral. I had to release the accelerator for several seconds and slowly reapply throttle before the transmission would re-engage. This occurred repeatedly and created a serious safety hazard when pulling into or crossing traffic because the vehicle could begin accelerating normally and then unexpectedly lose propulsion with approaching traffic. The transmission also exhibited severe harsh/banging shifts during harder acceleration and produced a rattling noise while slipping until the accelerator was released. CDF drum failure has been confirmed. The vehicle is currently at a reputable independent transmission repair facility undergoing a transmission rebuild due to the CDF failure. The transmission/components are available for inspection during the repair. There were no warning lights or messages that reliably warned of the impending loss of propulsion.…”