Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2021 Ford Mustang Mach E owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2021 Ford Mach-E. The contact stated while reversing from his driveway, he shifted into drive and depressed the accelerator pedal. However, the vehicle accelerated at high speed independently. There was no warning light illuminated. The contact continued to drive. The contact stated that the failure reoccurred the following day. The contact stated while his wife was exiting the carwash and making a left turn with a passenger in the front passenger seat, she shifted from neutral into drive and depressed the accelerator pedal. The vehicle accelerated at high speed independently and crashed into the block wall. The air bags deployed. The contact's wife sought medical assistance and was informed that she had sustained a fractured rib on the left side of her body, pain on the shoulders, and pain in the rib cage. …
The contact owns a 2021 Ford Mustang Mach-E. While the contact's daughter was driving at an undisclosed speed, the vehicle independently accelerated. The brake pedal was depressed; however, the vehicle failed to stop as intended. No warning lights were illuminated. The contact stated that the failure occurred while the vehicle was being parked in the residence driveway. The vehicle crashed into the right side of the residence before coming to a stop. The air bags did not deploy. The contact stated that the right side of the garage was damaged. No injuries were sustained. The contact stated that the failure was a known failure with the vehicle. The contact stated that an unknown recall with a similar failure was completed in 2022. The vehicle was towed to a local tow yard. The vehicle was deemed a total loss by the insurance company. The manufacturer was not made aware of the failure. …
The contact owns a 2021 Ford Mustang Mach-E. The contact stated that while her husband was driving slowly into the garage and the vehicle suddenly experienced unintended acceleration and crashed into the home and went through to the bedroom, causing damages to the vehicle and the home. No warning lights were illuminated. The vehicle was taken to a local dealer for an unrelated recall repair and the contact made the mechanic aware of the failure. The mechanic confirmed that there was no related recall on the VIN. The vehicle was not diagnosed. The contact was concerned about the safety of driving the vehicle and was referred to the manufacturer for guidance. The contact filed a claim with the insurance provider and the vehicle, and the home was repaired. The manufacturer was made aware of the failure and a case number was provided. The approximate failure mileage was 2,335.
The contact owns a 2021 Ford Mustang Mach E. The contact stated that while driving slowly in reverse and reversing of a parking space, the vehicle suddenly experienced unintended acceleration and erroneously drove across the street before crashing into an apartment building wall. During the crash, the driver sustained a lower back injury and left arm laceration which required medical treatment. The vehicle was towed to a local body shop. No police report was taken. The cause of the failure was not determined. The manufacturer was notified of the failure. The local dealer was not contacted. The failure mileage was 14,750.
The contact owns a 2021 Ford Mustang Mach-E. The contact stated that while her mom was driving, the vehicle accelerated without warning. The electrical system was inoperable. While the contact was driving at low speed in a parking lot approaching a stop sign, the vehicle accelerated. The brake pedal was applied but the vehicle continued to drive and crashed into a Toyota 4 Runner. The air bag deployed and impacted the driver in the face and she sustained knee injuries and cuts on her stomach and blood in her stool. A police report was filed. There were no reported fires. The vehicle was towed to an independent collision center. The vehicle was taken previously to the local dealer where the hardware was updated and a reboot was completed. The vehicle was repaired but the failure persisted. The manufacturer was not contacted. The failure mileage was unknown. The VIN was not available.
On approximately March 20, 2022, I was driving my Mach E vehicle. I pulled into a driveway and parked my vehicle. Upon exiting my vehicle, my vehicle began accelerating forward up the inclined driveway. It then struck a parked vehicle and came to a stop. The car accelerated uninetentionally which is in alignment with the current recall. Additionally, the advanced emergency braking did not work as the brakes did not deploy and the car only went back to rest after I re-entered the car post-accident.
When stopped at a stoplight, in unbridled mode with one pedal driving engaged, the car surged forward on it's own. The surge forward caused my vehicle to rear-end another vehicle. I would assume the failure was the one pedal driving system and it is available for inspection. The problem has not been reproduced or inspected yet, but we have an appointment for a Ford dealer to evaluate the car. The only warning was the pre collision warning which did go off.
I had my 2021 Mustang Mach-E updated with the recall software last year. In July of 2022, my High Voltage Battery Junction Box (HVBJB) still failed, giving me a service vehicle soon and SEVERELY reducing power WHILE driving. I was on the freeway and my car just started reducing speed since I was trying to pass someone and I almost hit them. I received the new HVBJB from my dealer and had been fine since. Then a couple of weeks ago, I received the errors AGAIN with this "new and improved" HVBJB that Ford said is more robust and not supposed to fail. Same thing, on the same freeway I commute (73 toll road in California). I was passing someone and the car hit me with all these errors and SIGNIFICANTLY reduced my power. Like 66% reduction. I had to get back into my lane and was able to get back a safe speed but you basically have no power to pass. This is unacceptable. …
I drove the car to work with no issues. I left work a little over 9 hours later. I was able to enter car without issues. Turned on car and didn't notice any issues. My phone connected as usual via CarPlay and I navigated home. Leaving the work area is low speed, so I never exceeded 20 mph and just went by feeling, but once I was on a more open stretch of road, I noticed that the instrument cluster was frozen and the speed it was displaying felt too slow compared to how I felt I was going. In essence, I couldn't tell how fast I was going. After closer examination (mind you I was driving while figuring this stuff out), I noticed that the instrument cluster would update once in say 10seconds or so (but it was variable). I tried to set cruise control to initiate blue cruise, but I couldn't tell what speed cruise control was being set to due to this enormous lag. …
The 2021 Mustang Mach-E has repeatedly shown these "Pre-Collision Assist" and "Front Camera Fault" errors ever since we got it 6 months ago. The errors can come and go multiple times during any drive. For my wife it is just an annoyance since she never uses Adaptive Cruise. But for me or anyone else using Adaptive Cruise, it becomes a safety concern because this error suddenly cancels the cruise and being an EV it begins regenerative breaking and slowing down much faster than other drivers expect while its driver must react as quickly as possible to return to pedal control. It's my understanding that this is starting to happen on many modern Ford vehicles at around this age and dealership service centers have been given guidance on fixing it. Ours has been in for this service and the error is still occurring.
Acceleration complaints in other Mustang Mach E years
Frequently asked questions
How common are acceleration problems on the 2021 Ford Mustang Mach E?
NHTSA has 37 complaints about the speed control & acceleration of the 2021 Ford Mustang Mach E, 11% of the model year's 351 complaints.
Is there a recall for 2021 Ford Mustang Mach E acceleration problems?
No. NHTSA lists no speed control & acceleration recall for the 2021 Ford Mustang Mach E, though it has 13 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2021 Ford Mustang Mach E acceleration problems start?
Half of the complaints with a recorded mileage happened before about 15,000 miles, and 80% before 25,000 miles.
Is it dangerous?
Owners linked 7 crashes, 0 fires and 4 injuries to speed control & acceleration problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.