2021 Ford Mustang Mach E: sudden loss of power

Filed Sep 28, 2026 · Electrical, Fuel system · TX

While accelerating on a highway on-ramp, the vehicle displayed Powertrain Malfunction/Reduced Power, a High-Voltage Battery Warning. Power was reduced while merging into traffic. The same warnings appeared at about 90,000 miles and cleared on their own. This is a Standard Range RWD Mach-E, which was excluded from the high-voltage battery junction box recall. The vehicle was towed to AutoNation Ford Katy and diagnosed with HVBJB failure. Loss of propulsion at highway speeds is a safety hazard. I am requesting that the federal safety agency investigate whether Standard Range vehicles should be included in the recall.

Filed Aug 15, 2025 · Electrical · CA

The contact owns a 2021 Ford Mustang Mach E. The contact stated that a message was received from the Ford App to check the 12-Volt battery. The local dealer was contacted and informed the contact that a service appointment was needed to have the battery checked. Later, while parking the vehicle, the vehicle lost power and the vehicle shut off, and the instrument panel went black. During the failure, the doors remained locked and could not be unlocked from inside or outside the vehicle. The vehicle was later towed to the local dealer who determined that the 12-Volt battery had failed and needed to be replaced. The battery was replaced and the vehicle was repaired. The manufacturer was notified of the failure. The failure mileage was unknown.

Filed Nov 6, 2024 · Electrical · 41,000 miles · NC

The contact owns a 2021 Ford Mustang Mach-E. The contact stated while driving 60 MPH, the messages "Power Train Malfunction - Reduced Power", "High Voltage Battery Warning", and another message to “Stop the vehicle as soon as possible because the vehicle may shut down without further warning” were displayed. The contact was able to pull to the side of the road. The contact was able to restart the vehicle and continued driving at 35 MPH. The vehicle was taken to the dealer but was not yet diagnosed or repaired. The contact related the failure to the federal safety agency Campaign Number: 23V687000 (Electrical System); however, the VIN was not included. The manufacturer was notified of the failure. The failure mileage was approximately 41,000.

Filed Oct 19, 2024 · Fuel system, Transmission · CA

Mach e standard edition shows multiple signs of a failing High Voltage Battery Junction Box (HVBJB). The vehicle was bought certified pre owned with only 12k miles on the vehicle. At 16k miles (2 months of ownership) the vehicle showed a high voltage battery warning and power train malfunction warning. Three warning lights were displayed on the dash which were: a yellow turtle, wrench, and car with exclamation. Vehicle was taken to service department where they ran updates and said the issue was a one pedal drive error and ran a standard osp for a power train update (not related to this power train issue). They made no mention of the battery and power train issue on the service record. 1-2 weeks later and about 1k miles, the same issue repeated. The vehicle was taken to a different dealership where they indicated the car had a over heating charge coupler and unbalanced battery "A". Both of these show a probable issue with the HVBJB. The dealership has been insistent that they can't do anything without a stored code. Prior OSP's updated the car to limit power when contactors in the HVBJB exceeded .5 ohms and would show all the warnings we have seen. The main 12 volt battery was replaced at 1k miles, which Ford did not realize the failure could have been from the HVBJB, as it receives charge from the primary batteries. The dealership and Ford engineers have requested that we drive the vehicle until the safety lights repeat, knowing that this puts us in danger of a larger malfunction that could result in complete loss of power while driving. They say that they cannot work on an issue unless a code is tripped. I suspect a code will not trip as the first two times nothing was stored and the OSP patch that NHSTS requested helps prevent the complete failure. The code will only be stored in a complete failure event, which could lead to an accident. There are current recalls for this HVBJB, however it is only for the higher end models. Out of space :) Thanks

Filed Aug 14, 2024 · Electrical, Fuel system · NY

Driving in a 40mph zone and car suddenly lost all power followed by a message stop safetly now and the 12v battery icon. While coasting car lost power steering and upon stopping went into park and would not go into neutral for 30+ minutes

Filed Jun 27, 2024 · Electrical · GA

9 months ago I received a safety recall notice from Ford Motor Company regarding the Mustang Mach E battery terminals could possibly melt together at high speeds and that the car will lose power. Considering the severity of this issue I took it to a dealership right away where it sat unable to be fixed for over a month. They did not offer me a rental and having 2 kids and no car was devastating. I had to go pick the car back up without the recall being repaired and have had to use the vehicle in the meantime because I have no other option. I filed a case through the Ford BuyBack Program and was denied. I filed a complaint with the Better Business Bureau in hopes of a remedy or mediation with Ford and was also denied. I just called 3 dealerships this week after receiving a letter in the mail that the parts were available and all of them said they do not have those parts. Because of this unrepairable safety recall, the cars value has depreciated and I am upside down my 20,000$. I can't sell it or trade it in without getting another loan just to pay it off and I refuse to do that for their mistake. There has to be another way. I need help and I'm praying I can find it here. I'm paying 735$ a month for a new car scared to drive every day.

Filed May 8, 2024 · Transmission · FL

I experienced the issue described in the federal safety agency Campaign Number: 23V687000. I had loss of power on the highway. I felt that my safety was at risk immediately after I lost power on the highway where other drivers were driving 60-80 mph. I managed to pull to the side of the road and waited in excess of 2 hours for a tow truck issued by Ford to arrive. The issue was confirmed at the dealer. The reason for my complaint is that I made an appointment with Ford for 4/16 and was told the parts would arrive in 3-5 business days. After 9 business days, the parts still had not arrived, and I experienced the issue that I was hoping to avoid.

Filed Apr 19, 2024 · Electrical, Fuel system · NV

On April 10, 2024, my vehicle experienced a warning message to service vehicle and a sudden loss of power while I was driving on the freeway. The issue was caused by a failure in my high voltage battery junction block. Something that Ford had already issued a software update vehicle to my vehicle for a recall. However clearly the software update was not an appropriate fix for the issue and should not be considered fulfillment of the recall. In fact, Ford has an open recall for the extended battery configuration of my vehicle to proactively replace this defective part. I am reporting this issue to the federal safety agency because clearly the software ‘fix’ did not resolve the safety issue AND it’s scary that standard range batteries are neglected from the overall recall that applied to the rest of the model. Ford needs to be proactively addressing this issue for all affected model years, not just certain configurations. Frankly it is wild that the federal safety agency accepted a software update as an appropriate recall fix for a hardware component overheating and melting while driving. It didn’t work and should not be considered a fix.

Filed Oct 3, 2023 · Electrical · TX

I want to draw attention to a significant concern: U.S. auto safety regulators announced in August of this year that they are currently investigating whether Ford Motor's 2022 recall of nearly 49,000 Ford Mustang Mach-E electric vehicles comprehensively addressed the associated safety concerns. The basis for the 2022 recall was that the high voltage battery main contactors could overheat, particularly from DC fast-charging and repeated wide-open pedal events. This overheating presents a very real danger as it could result in an immediate loss of power, markedly increasing the risk of a vehicular accident. Furthermore, after the recall, Ford issued a technical service bulletin, directing the replacement of the High Voltage Battery Junction Box on the recalled vehicles. However, the federal safety agency has since opened a recall query. This action was prompted by 12 consumer complaints related to Mach-E vehicles that had supposedly received the necessary recall fixes. It is worth noting that the High Voltage Battery Junction Box has been replaced on my Mach-E already, and I am still facing problems. This is my third encounter with this particular safety issue.

Filed Sep 18, 2023 · Driver assistance, Transmission · NJ

While driving on the NJ turnpike I notice a grinding noise. I was using 1 pedal drive at the time. Once I disabled the 1 pedal drive. I received multiple dash board alerts and App alerts that the Mach E was experiencing a Powertrain Malfunction/ Reduced power. Hill start Assist Warning/Pre-Collision assist Not available. This happened on 8/24/2023. I drove to the dealership and left the vehicle with them to look into the alerts and grinding noise. I called the dealer the next week and was told that the front motor had failed and a replacement was ordered. I reached out today 9.18.23 and learned it was an oil leak that caused the motor to fail and that a new motor was being ordered, the original part number was replaced with the new part. I was told that it will take another month. I do not know if the part was examined by the manufacture. I my odometer was at 45,000. I was concerned while driving to the dealer that I would lose all power.

Filed Sep 5, 2023 · Electrical · NY

Loss power, high voltage problem. On August 13 2023. On a road trip .

Filed Aug 22, 2023 · Electrical, Fuel system · NV

The HVBJB subassembly in ALL Ford Mach-e vehicles has known defects with 'under-designed' main contacts that are known to fail under normal charging and driving conditions as outlined in current open Ford recall notice. Unfortunately, the internal damage to contactors is not visible externally, and warning notices on display only AFTER the damage has occurred, and can result in sudden loss of propulsion power at highway speed, loss of power steering, and power brakes... and failure of other 12v systems due to failure to charge the 12v battery properly after contacts are damaged. Less catastrophic results can include failure to start; which can 'strand' driver's and passengers in remote areas, bad weather conditions, as well as cause loss of use for weeks due to delays in replacement parts and local Dealerships needing equipment and training to effect removal/replacement of faulty unit with a new HVBJB having re-designed 'beefier' components.​ ​ My complaint is that Ford's recall notice 22s41 is a software-only attempt to prevent future damage, and does not require removal of the part(s) which are KNOWN TO FAIL to be replaced with the re-designed components which are available, and have been used to repair failures under warranty. I have no way of inspecting the original equipment to evaluate current condition; and failure can result in sudden and unexpected loss of power, steering, and braking as well as potentially 'stranding me' in unsafe conditions unable to re-start my vehicle.​ ​ I would like to see the federal safety agency strengthen the Ford recall to include both improved software AND removal/replacement of the HVBJB sub-assembly with the new 'beefier' parts.​