2021 Ford F-150 power train problems

“My 2021 F-150 PowerBoost hybrid repeatedly lost propulsion while traveling on the highway in early October 2026, including four incidents on one trip around October 3. At approximately highway speed, the tachometer dropped to zero while the selector remained in D, and the truck coasted as if in neutral. There were harsh shifts around 9th/10th gear and difficulty accelerating beyond approximately 70 mph. A vehicle warning appeared. Disconnecting and reconnecting the battery temporarily restored operation. Sudden loss of drive power in highway traffic created a collision risk. The underlying cause has not been independently established. A Ford dealer's October 2026 inspection recorded an internal transmission hydraulic leak, clutch-disconnect trouble codes suggesting a hybrid drive unit concern, a recommendation to replace the transmission with the hybrid drive unit, and high-voltage battery cell-balance DTCs. More recently electric-driving mileage has remained at zero and the gasoline engine continues running while stationary. Severe shifting and vibration had varied between 2H and 4A modes. Around June 2025 the vehicle also stopped operating and was towed to…”

“The cdf is outdated and the truck would get stuck in the wrong gear and not work. I was only 3,800 miles over the 60k mile warranty and having to pay out of pocket for a updated cdf drum that ford has created because they know the old ones are faulty”

“The contact owns a 2021 Ford F-150. The contact stated that while driving 15 MPH, the transmission independently shifted into park and the wheels screeched to a stop. The dealer was contacted and made aware of the failure, and the contact was informed that the parts were unavailable to repair the vehicle. The failure became persistent with the check engine warning light illuminated. The contact stated that the vehicle was unsafe to drive. The contact had very important doctor’s appointment scheduled, and the vehicle was the only source of transportation. The contact received notification of NHTSA Campaign Number: 26V402000 (Power Train); however, the part to do the recall repair was unavailable. The manufacturer was contacted, and several cases were filed. The failure mileage was approximately 107,000.”

“The contact owns a 2021 Ford F-150. The contact stated that the vehicle was scheduled for repair under NHTSA Campaign Number: 26V402000 (Power Train); however, the part to complete the recall repair was not yet available. The contact stated that while driving at an undisclosed speed, the vehicle suddenly shuddered, and manual mode was utilized to bypass 5th gear and upshift into 6th gear. A warning message reading "Service Recall" was displayed. The local dealer was notified on several occasions. Another local dealer, where the vehicle was originally purchased, was contacted for a second opinion. The manufacturer was notified of the failure via telephone. The failure mileage was approximately 78,000.”

“I have experienced ongoing issues with transmission. Two separate dealerships have done partial "rebuild" to no avail. The vehicle has lost power several times which include XXX at approximately 3:30 pm. while pulling onto a busy highway in heavy traffic. As soon as I got home, I parked the truck in the carport where it remains as of this writing. There have never been any warning lights, symbols, etc. on dash when these and other multiple problems with this vehicle happened. Multiple technicians have duplicated all of the issues that I have reported to the dealerships. I have been in touch with Ford Motor Company several times and have an open case with nothing from their representatives except to say how sorry they are. Second dealership has stated both verbally today, XXX, and in writing on XXX that he personally oversaw a complete teardown of this transmission on XXX when C-clutch was replaced see service order#XXX although parts list doesn't support his statement. Please refer to service order #XXX which is a documented failure of the E-clutch in my vehicle. The service manager at [XXX] O[XXX] states that this document is "speculation" on the part of the…”

“Vehicle: 2021 Ford F-150 Tremor Mileage: Approximately 103,000 miles My 2021 Ford F-150 Tremor developed a severe shudder and vibration during acceleration. The condition progressively worsened and became significant enough that I had the vehicle professionally inspected. The vehicle was diagnosed with a failing torque converter as the cause of the acceleration shudder/vibration. The truck has been well maintained throughout my ownership. It is garage kept and receives regular maintenance through an authorized Ford service facility. I have maintenance records documenting the vehicle’s service history. My concern is that the torque-converter failure produces a severe vibration/shudder during acceleration and has progressively worsened. I am concerned about the potential safety implications if the torque converter or transmission continues to deteriorate while the vehicle is being driven. I contacted Ford regarding the failure and requested assistance with the repair. The vehicle is outside Ford’s original powertrain warranty at approximately 103,000 miles, and Ford declined to provide assistance. I am submitting this complaint so NHTSA has a record of this…”