2021 Ford F-150 Hybrid power train problems

“Violent upshift and downshift, erratic shifting, difficulty finding gears, high revs, stuck in 10th gear more than two times, failure to find gears, loud bang when CDF drum seal blew along with loss of power causing it to rapidly slow down, unable to accelerate due to it being stuck in second gear, and unable to accelerate from takeoff causing close calls with traffic.”

“On January 16, 2026, my Ford F-150 experienced catastrophic 10R80 transmission failure while I was driving to work on the highway. Prior to the failure, I experienced increasingly severe and erratic upshifting and downshifting, particularly between 3rd and 4th gears. The transmission shifted harshly and unexpectedly, raising concerns about its reliability and safety. On the morning of January 16, 2026, the transmission suddenly failed without notable warning. It appeared to lock up, producing extremely loud and alarming mechanical noises. While traveling at highway speed, the rear wheels locked up, causing an immediate and dangerous loss of vehicle control. I was forced to perform evasive maneuvers to avoid striking nearby vehicles. Fortunately, I was able to regain sufficient control to pull onto the highway shoulder without a collision. This incident could easily have resulted in a serious crash, injuries, or fatalities. Following the incident, I contacted Ford and the dealership regarding the failure and safety concerns. Both denied warranty coverage, leaving me responsible for more than $8,000 in out-of-pocket expenses to have the transmission rebuilt. This…”

“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…”

“I picked up my F-150 Powerboost from the Ford dealership after getting and oil change. Recorded mileage was 100,385 (just 385 miles out of the 100,000 EV warranty. Just 2 hours after getting it back the check engine light came on for P0B24 for hybrid battery failure. The Ford dealership diagnosed the issue and confirmed the entire hybrid battery has to be replaced. I requested Goodwill assistance from Ford being that it was <500 miles out of warranty. Ford denied the request immediately. The Ford service department wrote them an email with official confirmation of the issue and the timing of the issue starting. Ford denied their request for Goodwill assistance/financial help within 20 minutes of the request. The repair is $5,000+ out of pocket.”

“Front Differential had a major failure and had to be replaced. Vehicle only has 31000 miles on it. Warranty did not cover anything. Report said fluid was burnt.”

“Experiencing total stop of acceleration in two occasions: 1) when putting the car in reverse and pressing the accelerator and 2) when making a left or right turn after a yield or stop. And when I say loss of acceleration, I don’t mean hesitation, reduced power, or sluggish acceleration. I mean absolutely ZERO acceleration. I’ll press the accelerator and nothing happens. The engine stays basically at idle, and the truck will not accelerate for roughly 5-10 seconds, regardless of how much accelerator I’m giving it. Then suddenly power comes back and the truck drives normally again. This happens with normal operating temps while driving most of the day. It got to a point where it happened once every day. Very scary stuff when you're pulling out into traffic - major safety concerns with oncoming traffic.”