2021 Ford F-150 Hybrid: sudden loss of power

Filed Nov 9, 2026 · Transmission · NM

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.

Filed Sep 13, 2026 · Engine, Fuel system · MI

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.

Filed Sep 4, 2026 · Fuel system · MI

On XXX, my 2021 Ford F-150 PowerBoost, VIN [XXX], stalled while I was turning from [XXX] onto [XXX]. My wife and daughter were in the vehicle. The engine lost all power in the intersection. No collision occurred. This is the exact failure described in open safety recall Ford 25S75 / the federal safety agency 25V455 (low-pressure fuel pump). I had already reported the unrepaired recall to the federal safety agency on XXX. I took the truck to LaFontaine Ford in [XXX] the same day. As of XXX, Ford still has no released remedy or parts, the dealer had not completed an inspection, and Ford Customer Care refused a courtesy vehicle. I am submitting a separate 49 C.F.R. Part 557 petition asking the federal safety agency to hold a hearing on Ford’s failure to remedy this recall. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

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 Jul 17, 2026 · Fuel system · MI

On July 15, 2026, I took the vehicle to Lafontaine Ford for maintenance and to address open recalls. I was informed that the open recall for the low-pressure fuel pump (campaign 25S75) did not have a solution available. Due to the severity of the recall, I contacted the Ford Customer Care Center. A representative stated that a solution would be available on July 17, 2026, and that they would contact Lafontaine Ford to prioritize the vehicle for repair on July 18, 2026. On July 17, 2026, I followed up with Lafontaine Ford and confirmed they had received no contact or notation from Ford regarding prioritization. Lafontaine Ford also stated they had no information on when parts would become available and that nothing could be done at that time. I then contacted the Ford Customer Care Center again because no action had been taken, even though the recall has been open since approximately July 8, 2025. A Ford Customer Care Center representative confirmed that no remedy was available for my model year and that they did not know when one would be available. Due to the seriousness of the recall, I requested a courtesy vehicle. The Ford representative contacted Lafontaine Ford regarding this request and then disconnected the call. The Lafontaine Ford representative informed me they could not provide a courtesy vehicle without written confirmation from Ford due to the dealership having no reasonable timeframe of when parts/remedy would be available. When I called the Ford Customer Care Center back and explained what Lafontaine Ford had told me, I was treated indifferently and was disconnected twice. I eventually spoke with a supervisor who refused to escalate the concern or provide any assistance with the documentation Lafontaine Ford said they needed in order to provide a courtesy vehicle. The low-pressure fuel pump is the component identified in the recall and can fail, resulting in loss of engine power or stall while driving. This creates a significant safety risk, part

Filed Mar 25, 2026 · Electrical, Engine · OK

Vehicle Information 2021 Ford F-150 PowerBoost VIN: [XXX] Complaint Description While driving approximately 70 mph on a highway, my 2021 Ford F-150 PowerBoost suddenly displayed a “Stop Safely Now” message and immediately lost propulsion. The engine shut down without warning while I was in active traffic. After the shutdown, the vehicle automatically shifted into park and would not allow me to shift into neutral. This left me unable to move the vehicle out of a live traffic lane. I was forced to shut the vehicle off while still in a dangerous roadway position. This incident created a serious safety hazard, as I was traveling at highway speed and could have been rear-ended due to the sudden loss of power and inability to move the vehicle. This issue appears to match Ford Technical Service Bulletin (TSB) 23-2317, which describes “Stop Safely Now” warnings, no-start conditions, and gateway module (GWM) software faults. This indicates a known defect that can cause sudden loss of propulsion. A claim has already been opened with Ford Motor Company under case number [XXX], and the vehicle is currently at a Ford dealership for diagnosis. At this time, the issue has not been resolved. This failure occurred without warning and presents a significant risk to driver safety and others on the road. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jan 18, 2025 · Electrical, Engine · 115,000 miles · CA

When turning right there was a complete loss of power with no response from the throttle it was just stuck coasting at 20klm hr. For 20 seconds or so then throttle kicked in and normal operation again. This has happened twice now in the past week. Very dangerous especially when turning into traffic.

Filed Apr 4, 2024 · Electrical, Transmission · VA

2021 f150 POWERBOOST [XXX] Loss of engine power. Major electrical failure display on dash coast to a stop. Unable to restart, lock in park unable to be move from location. After 45 mins. of pushing restart button every 60 seconds get a restart, take to dealer unable to find problem.[XXX] Loss of engine power. Major electrical failure display on dash coast to a stop. Unable to restart, lock in park unable to be move from location. After 45 mins. of pushing restart button every 60 seconds get a restart. Notified dealer appt set for 20Jan2024 Special order pump was order for trans. {XXX] Truck was drop for the pump to be replace. [XXX] Dealership called, while the Tech was on a test drive, after the pump was installed, the Tech. had a Loss of engine power. Major electrical failure display on dash coast to a stop .Unable to restart , lock in park unable to be move from location. Dealer ship contacted Ford and and engineer has handle the repairs. The truck has been on the lot now for over 30days with now a needing a special order part on National back order. Have contacted Ford case # [XXX] with 2 attempts with no return phone calls. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 3, 2023 · Transmission · VA

The axle bolt on both rear wheel hubs has sheared about 1/2 inch down the bolt. This led to the gradual loss of power to the effected wheel hub causing unpredictable handling characteristics as the interface between the axle and the wheel hub degrades due to the fastener being sheared off.

Filed Feb 22, 2023 · Driver assistance, Transmission · OR

Powertrain malfunction / reduced power error

Filed Jan 10, 2023 · Transmission · CA

While traveling at around 70 mph, the truck felt like it losing power. As I further step on the accelerator, the truck didn't response. The truck then jerked and shifted to gear 9 and jerk again then shifted back to gear 10. This happen for about 10 to 15 minutes and back to normal. During this time the truck loss the ability to accelerate. This happen during the cruise control engaged and also happen without the cruise control engaged. When this happen, the truck had about 35,000 miles and it happened during a road trip from Southern California to Flagstaff, AZ. The problem also happened on the way home. The problem was not observed as the truck travel at 65 mph or less.

Filed Oct 12, 2022 · Transmission · CO

I took my 2021 F150 Powerboost with Max Tow package into the Ford dealership for service and to inspect a noise coming from the driverside rear wheel. When the wheel was removed the source of the noise was confirmed as a sheered-off axle retaining bolt. I was told by the service department the truck was unsafe to drive. I am unsure if this nut holds on the wheel hub assembly but I'm guessing it could lead to loss of power in the affected drivewheel or loss of the wheel altogether. Upon doing some internet research this is quite a common issue with the 3/4" floating axle that was new to the 2021 model year for the Max Tow package. This is an issue with the drivetrain of the vehicle that could lead to safety issues for the occupants and others and should be recalled with upgraded/redesigned parts.