2021 Ford F-150 Hybrid: complete transmission failure

Filed Nov 7, 2026 · Transmission · CT

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 was not merely a mechanical inconvenience. The combination of severe, erratic shifting followed by catastrophic transmission failure and rear-wheel lockup at highway speed presents a serious safety hazard. I am submitting this complaint because I believe the Ford 10R80 transmission may have a safety-related defect that places drivers and others on the road at risk. Other owners could experience the same sudden failure and loss of vehicle control without warning. I urge the federal safety agency to investigate these transmission failures, particularly the potential for sudden transmission lockup and rear-wheel lockup while driving at highway speeds.

Filed Oct 29, 2026 · Electrical, Fuel system · VA

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 same dealer; I understand a 12-volt battery was replaced. Photographs from that period show Stop Safely Now and other warnings around 70,000 miles. I request investigation of whether that earlier incident and the present faults are related; I do not claim the same root cause has been proven. Exact diagnostic codes and earlier service details should be verified from the dealer records. The October intake odometer was recorded as 99,632; mileage at the highway incidents is not precisely known.

Filed Oct 23, 2026 · TX

Formal Financial Assistance Statement RE: Goodwill Cost-Share Request for 2021 F-150 King Ranch VIN: [XXX] Current Mileage: 119,000 miles Diagnostic Trouble Codes: P2704, P07E6, P2886, P2885 Dealer Repair Quote: $9,820.50 (Full Internal Transmission Replacement) To Whom It May Concern at Ford Motor Company and Dealer Leadership: I am formally requesting a corporate Goodwill Cost-Share for the catastrophic internal transmission failure on my 2021 F-150 King Ranch. While this vehicle is slightly past its 100,000-mile powertrain coverage, a total mechanical failure on a top-tier luxury vehicle at this stage—caused by well-documented, inherent factory defects—is entirely unacceptable. The diagnosis and fault codes pulled by the certified mechanic map directly to systemic, factory-recognized hardware flaws in the 10R80 10-speed transmission: 1. The Core Mechanical Failure (TSB 24-2209 / TSB 23-2250): My truck exhibits severe gear slippage and loud internal clunking, triggering code P2704 (Friction Element E Apply Time). As documented heavily by Ford’s own service network, this code is the direct result of a design flaw where the internal CDF clutch drum bushing migrates out of place under heat, slicing internal seals and destroying line pressure (triggering pressure codes P2885 and P2886). 2. The Safety Concern (Code P07E6): My transmission has also thrown code P07E6 (Unable to Engage Park), which directly mirrors the mechanical components Ford is actively tracking for transmission parking pawl issues. Ford Motor Company has issued multiple Technical Service Bulletins acknowledging this exact failure sequence and has since redesigned the CDF drum assembly to correct the manufacturing flaw. I should not be held solely responsible for a $9,820.50 repair bill caused by a component that Ford has publicly acknowledged was defectively designed from the factory. As a loyal Ford customer driving a premium vehicle, I expect Ford to stand behind its product. I am req INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION

Filed Aug 3, 2026 · Transmission · TX

I am filing a safety complaint regarding a recurring, hazardous transmission failure during highway and incline driving (specifically experienced on mountain highway passes in Arkansas). While driving at highway speeds on uphill inclines, the transmission severely hesitates and struggles to downshift under load. When it finally engages, it violently slams into gear. During these episodes, the truck experiences a sudden loss of motive power and acceleration lag, accompanied by an engine RPM flare of over 400+ RPM. And most recently, I have Live diagnostic data captured during operation revealed a downshift delay of over 3 seconds where the powertrain control module commanded 8th gear, but the transmission physically remained stuck in 10th gear due to severe internal hydraulic pressure loss. This defect presents a severe safety risk on high-speed roadways. Sudden, unexpected loss of power while climbing grades or merging into traffic creates an immediate risk of rear-end collisions from surrounding vehicles. This issue directly correlates with Ford Technical Service Bulletin TSB 26-2287, which identifies axial movement/slippage of the CDF clutch cylinder sleeve as the root cause of internal fluid leaks and gear failure. Because this internal hardware failure causes unpredictable power delivery and driveability loss at highway speeds, I request that the federal safety agency investigate the 10R80/10R80-MHT transmission CDF drum sleeve defect as a critical safety hazard. Finally, Ford motor company, and most cases refuses to repair this known defect under warranty, many owners are experiencing this dealership pushback leaving them with a critical safety issue.

Filed Aug 2, 2026 · Transmission · CA

I am reporting a safety-related transmission problem I experienced with my 2021 Ford F-150 equipped with the 10R80 automatic transmission. While driving normally, the transmission suddenly has lost propulsion and RPMs flare while driving steadily uphill. This occurred while merging onto a fast moving highway and while traveling at a steady speed going uphill, creating a potentially dangerous situation because the truck did not respond as expected when I needed predictable acceleration or propulsion. I believe this incident may be related to the known 10R80 CDF clutch-cylinder/sleeve problem. Ford technical information identifies axial movement of the CDF sleeve that can cause hydraulic-circuit leaks and harsh or delayed engagement and shifting. This condition can result in slipping, RPM flares, delayed engagement, unexpected gear changes, harsh downshifts, lurching, or loss of propulsion. This is a safety concern, not merely a transmission quality or reliability issue. Unexpected loss of propulsion or unpredictable shifting while merging, accelerating into traffic, crossing an intersection, turning, or traveling at highway speed can create a collision hazard. Because I personally experienced this unexpected transmission event, I request that the federal safety agency investigate the 10R80 CDF clutch-cylinder/sleeve condition in Ford F-150s. Please review Ford warranty claims, dealer repair records, transmission replacements, consumer complaints, and field-failure data to determine whether this is a safety defect requiring a recall. I believe owners should not have to wait for a potentially dangerous transmission failure before this known condition is addressed.

Filed Aug 2, 2026 · Engine, Fuel system · AL

I am reporting a safety-related transmission problem I experienced with my 2021 Ford F-150 equipped with the 10R80 automatic transmission. While driving normally, the transmission suddenly shifts hard/lags on gears 3-5 and sometime higher gears 7-9 at higher speeds. I’ve also noticed a buzzing/metallic rattling coming near the engine from inside. There is also times i can tell i have no power when trying to speed up and the other day i almost thought i was going to get T-Boned. This occurred while on my daily traffic commute to work, creating a potentially dangerous situation because the truck did not respond as expected when I needed predictable acceleration or propulsion. I believe this incident may be related to the known 10R80 CDF clutch-cylinder/sleeve problem. Ford technical information identifies axial movement of the CDF sleeve that can cause hydraulic-circuit leaks and harsh or delayed engagement and shifting. This condition can result in slipping, RPM flares, delayed engagement, unexpected gear changes, harsh downshifts, lurching, or loss of propulsion. This is a safety concern, not merely a transmission quality or reliability issue. Unexpected loss of propulsion or unpredictable shifting while merging, accelerating into traffic, crossing an intersection, turning, or traveling at highway speed can create a collision hazard. Because I personally experienced this unexpected transmission event, I request that the federal safety agency investigate the 10R80 CDF clutch-cylinder/sleeve condition in Ford F-150s. Please review Ford warranty claims, dealer repair records, transmission replacements, consumer complaints, and field-failure data to determine whether this is a safety defect requiring a recall. I believe owners should not have to wait for a potentially dangerous transmission failure before this known condition is addressed.

Filed Aug 1, 2026 · Transmission · GA

I am reporting a safety-related transmission problem I experienced with my 2021 Ford F-150 equipped with the 10R80 automatic transmission. While driving normally, the transmission suddenly slipped at least twice, and shifts violently often. The truck while driving on a 35mph road after just going over a railroad track I went to accelerate and lost gear and the transmission slipped really bad and violently caught a gear after reaching around 4000 rpm. The truck also shifts violently when under moderate acceleration at almost all times in gears 2-5 creating a potentially dangerous situation because the truck did not respond as expected when I needed predictable acceleration or propulsion. I believe this incident may be related to the known 10R80 CDF clutch-cylinder/sleeve problem. Ford technical information identifies axial movement of the CDF sleeve that can cause hydraulic-circuit leaks and harsh or delayed engagement and shifting. This condition can result in slipping, RPM flares, delayed engagement, unexpected gear changes, harsh downshifts, lurching, or loss of propulsion. This is a safety concern, not merely a transmission quality or reliability issue. Unexpected loss of propulsion or unpredictable shifting while merging, accelerating into traffic, crossing an intersection, turning, or traveling at highway speed can create a collision hazard. Because I personally experienced this unexpected transmission event, I request that the federal safety agency investigate the 10R80 CDF clutch-cylinder/sleeve condition in Ford F-150s. Please review Ford warranty claims, dealer repair records, transmission replacements, consumer complaints, and field-failure data to determine whether this is a safety defect requiring a recall. I believe owners should not have to wait for a potentially dangerous transmission failure before this known condition is addressed.

Filed Aug 1, 2026 · Transmission · TN

I'm reporting a transmission problem on my 2021 Ford F-150 with the 10R80 automatic transmission that I believe is a safety issue, not just a reliability one. The truck currently has about 55,000 miles on it. Right now the truck shifts hard and jerks every time I drive it, and it's especially bad at low speed. The worst situation is creeping through a parking lot looking for a spot, the transmission drops down into first with a clunk and a jerk, and then kicks again when it shifts back up out of first. It's rough enough that I've taken to putting the truck in "Eco" drive mode on purpose, because that softens the shift profile and takes a little of the edge off. Once I'm out of the low-speed stop-and-go and up to normal road speed, it seems to smooth out and drive okay, but the low-speed shifting is genuinely excessively rough. From what I've read, this matches the known 10R80 problem where the CDF clutch sleeve can move axially and cause hydraulic-circuit leaks, which leads to slipping, RPM flares, delayed or harsh engagement, and unexpected shifts. Everything I've found says this condition progressively worsens as the transmission degrades. That's exactly why I'm filing now rather than waiting. A hard, unpredictable shift or a loss of propulsion at the wrong moment — pulling into traffic, crossing an intersection, merging — can easily cause a collision. I don't want to wait until it fails in a dangerous spot and someone in my family gets hurt. I'd like the federal safety agency to investigate the 10R80 CDF clutch-cylinder/sleeve condition on Ford F-150s and to review Ford's warranty claims, dealer repair records, transmission replacements, and other owner complaints to determine whether this is a defect requiring a recall. Owners shouldn't have to wait for a dangerous failure before a known condition like this is addressed.

Filed Jan 27, 2025 · Transmission · 79,000 miles · NY

The contact owns a 2021 Ford F-150. The contact stated while driving 60 MPH, the transmission independently shifted to neutral, and the vehicle decelerated. In addition, the power train failure warning light illuminated. The contact stated that within several seconds, the vehicle returned to normal speed, and the power train failure warning light was no longer illuminated. The contact stated that the failure occurred while driving on a major highway. The vehicle was taken to the dealer where it was diagnosed with an external transmission failure. The contact was informed that the transmission needed to be replaced, and the software needed an update. The vehicle was not repaired. The contact was informed of an unknown recall however, the VIN was not included in the recall. The manufacturer was made aware of the failure but provided no assistance. The contact was advised to contact the federal safety agency Hotline to report the failure. The failure mileage was approximately 79,000.

Filed Jun 13, 2024 · Electrical, Transmission · CA

At a stop, in electric mode, truck will lunge forward as if you were rear ended. Most of the time, transmission failure will occur after some time due to this lunging forward, and it has happened to many truck owners. Electric auxiliary transmission pump tends to be the cause .