2021 Ford Mustang Mach-E electrical system problems

“On August 8, 2026, my 2021 Ford Mustang Mach-E Premium experienced a serious electronic lockout. The vehicle was running, with the air conditioning and music on, when the doors locked and I was unable to regain entry. My keys, phone, purse, medication, and other essential belongings were inside the vehicle. I attempted multiple methods to regain access, including the driver’s door keypad, but I was unsuccessful. I remained locked out for approximately 7.5 hours and ultimately had to break the windshield to reach inside and unlock the vehicle. My understanding is that Ford had previously performed a recall remedy addressing a potential electronic door-lockout issue on this vehicle. I am concerned that the vehicle experienced a similar safety-related malfunction after that remedy. I do not yet know the precise technical cause and am requesting investigation. Following this incident, my vehicle experienced repeated 12-volt battery and no-start problems. When the vehicle was left at Kenny Ross Ford for diagnosis, I was later unable to get it to respond to the key or show lights or audible signals, and it did not appear to respond when connected to a charger. The…”

“2021 model mustang Mache got a new High Voltage Battery Warning on the dashboard and asked to stop the vehicle. My car is Premium trim standard range, but other trims and extended range battery models were recalled for this exact issue earlier, but the premium trim standard range car was not included in recalls. I have read online forums that many people who own standard range cars are seeing this warning suddenly now. Please work with Ford to include standard range cars from 2021 mustang Mache EV to recall for this repair, i think it is also called HVBJB error. I don't have the exact recall number issued for extended range cars earlier for this same error.”

“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 NHTSA investigate whether Standard Range vehicles should be included in the recall.”

“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.”

“I own a 2021 Ford Mustang Mach-E Standard Range RWD. My vehicle has experienced a high-voltage powertrain malfunction involving the high-voltage battery system/HV Battery Junction Box (HVBJB). The vehicle is currently at a Ford dealership for diagnosis and repair. What concerns me is that the same high-voltage/powertrain warning appeared on my vehicle previously, before the vehicle reached 100,000 miles. The warning appeared in my FordPass history, then went away. The vehicle later developed the same type of warning again, and the problem has now resulted in a current high-voltage powertrain malfunction. My vehicle is not included in the existing HVBJB recall (23S56) based on its VIN/build configuration. I believe this may indicate that vehicles outside the current recall population can experience the same HVBJB/high-voltage failure. I contacted Ford about the issue and requested Goodwill Assistance. Ford denied the request. I am asking NHTSA to review whether the existing recall population adequately covers 2021 Mustang Mach-E vehicles experiencing this failure and whether vehicles outside the current recall population may have the same safety defect. The fact…”

“My 2021 Ford Mustang Mach-E (142,009 miles) intermittently fails to accept a charge at public DC fast-charging stations. My husband relies on these stations because our home electrical panel cannot support a home EV charger, and he uses this vehicle daily for his work in commercial real estate, often needing to charge it twice a day while traveling throughout Southern California. We first brought the vehicle to Tuttle-Click’s Capistrano Ford (San Juan Capistrano, CA) for this issue, and were charged $250 for a diagnosis and software-related repair (Invoice XXX, dated XXX). The technician’s notes state the vehicle would stop charging after about a minute at DC fast chargers, that the code P0EEE:27 was stored in the SOBDM module, and that the battery was manually charged to 99% and the code cleared. Ford refunded the $250 after the same problem recurred shortly after this repair. When we brought the vehicle back in a second time for the identical issue, the dealership informed us that Ford currently has no fix for this defect, and that only a Level 1 or Level 2 AC home charger can reliably charge the vehicle — which is not an option for us since we have no home…”