2021 Ford Mustang Mach E fuel system problems

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

My 2021 Mustang MachE experienced a failure of the relay which connects its high-voltage battery to the rest of the car. The car is an EV, and the result of this is that the drive-motor had no power, and the car would not move. I would like to ask, please, that all model years with this known-issue (HVBJB - high voltage battery junction box) be recalled.

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 6, 2026 · Electrical, Engine · NJ

The HVBJB ($3500 + Tax) went on my car. It is out of battery system warranty by 25,000 miles (ended at 100,000 miles, I have 125,000 miles). I called Ford Corporate and they said they "have no current programs" to give me any good will discount on the repair. This is a big, known issue with Mustang Mach-e's There was a recall for this HVBJB part / system on many of the 2021 models, but somehow mine wasn't included in the recall. I cannot afford this repair, and I was hoping the federal safety agency can get involved to get me some financial relief from Ford. There was also a safety issue as this morning when this all happened, the car forced me to stop at an intersection and would not move or restart. The police had to push me through the intersection. It's currently at Chapman Ford in Egg Harbour Townshop, NJ.

Filed Feb 7, 2026 · Electrical, Fuel system · PA

After recall-related software updates were performed on my 2021 Ford Mustang Mach-E, the vehicle began experiencing repeated electrical and climate control failures. The heating and defrost system stopped working, leaving the vehicle without heat and causing the windows to fog, which reduces visibility in cold weather and creates unsafe driving conditions. The vehicle has been taken to multiple authorized Ford dealerships for inspection and repair; however, the problem returned immediately after the repair. The issue was reproduced and confirmed by a second dealer. A required part is currently on back order until the end of Feburary, leaving the vehicle unrepaired for an extended period. In addition, the vehicle experienced 12-volt battery failure and slow charging after the last recall update. These issues were not present prior to the recall. There were no warning lights before the failures occurred. During severe winter weather conditions in Pennsylvania, the lack of heat and defrost made it extremely difficult and unsafe to operate the vehicle. Because of reduced visibility and freezing interior temperatures, the vehicle could not be safely driven and, due to frigid temperatures, has remained parked. I am still making monthly payments on a vehicle that cannot be reliably or safely used.

Filed Oct 15, 2025 · Brakes, Electrical · GA

Car stalled once while going to a military appt but started up 3 mins later. Car then made a noise then stalled out of nowhere on the highway at a slow speed in heavy traffic causing anxiety. vehicle then had me stranded waiting for a tow to find out it’s the HVJB .

Filed Dec 26, 2024 · Electrical, Fuel system · NY

It has several error messages including "Stop safely now". This seems to be the same issue as recall 23S56 (TSB 22-2178). The vehicle is not drivable as it will not start or go into gear. Seems to be known issue with the HVBJB.

Filed Oct 31, 2024 · Acceleration, Fuel system · CO

It accelerated unexpectedly with no input while decelerating in one pedal drive mode. Cruise control was not in use at all during the drive.

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 May 6, 2024 · Fuel system · FL

Took vehicle to dealership for warranty repair as dealer confirmed parts available. Did not do repair due to Ford issuing a email to stop all repairs under this recall until further notice. Contacted Ford no reason why recall repairs stopped, no information when they would begin again. Ford recall notice blatant information without explanation. the federal safety agency site information is not accurate, parts are available but for undisclosed reasons they will not perform repair.