2021 Ford Mustang Mach-E electrical problems

The HVBJB contains main contactors that overheat and fail under normal driving and DC fast-charging conditions, causing sudden loss of propulsion, steering, brakes, and 12V charging function. Owners report the part melts internally with no external warning prior to catastrophic failure. Multiple complaints cite owners experiencing complete vehicle shutdown at highway speed with loss of all electrical systems.

When: Occurs without warning after normal driving or fast charging; some owners report failures after 7,000–40,000 miles; some failures occur multiple times in early ownership (under 1 year, 13,000–21,000 miles)

Symptoms owners cite: Sudden loss of propulsion and all electrical power while driving; Loss of power steering and power brakes mid-drive; Multiple error messages on dashboard ('STOP SAFELY NOW', 'Service Now', 'Battery Service'); Vehicle unable to shift into gear or neutral; Complete electrical shutdown; doors lock and cannot be opened; 12V battery unable to charge despite HVB showing charge; Erratic flashing of lights and speakers emitting thumping sounds; Failure to start after initial shutdown

Codes mentioned: P0AA2 - Hybrid battery positive contactor circuit stuck open, U0594 - Invalid data received from hybrid powertrain control module, NHTSA Campaign 22V412000, NHTSA Campaign 23V687000

Repairs/costs cited: Ford initially issued software-only recall (22S41) attempting to prevent future damage by limiting fast-charging and pedal aggression. Owners report this is inadequate and does not prevent failures in vehicles already experiencing the problem. Redesigned HVBJB with 'beefier' contactors exists and has been used for warranty repairs, but recall does not mandate hardware replacement—only software update. Some owners report replacement costs around $3,000 out of pocket when not covered by warranty. Replacement part availability has been severely delayed.

Recalls/TSBs owners mention: Ford Recall 22S41 (software update only); Ford Recall 23V687000; TSB 23-2155; Some vehicles received redesigned HVBJB under warranty but only after failure occurred. Redesigned parts exist but are not being proactively installed. Ford issued a technical service bulletin directing HVBJB replacement on some recalled vehicles, but parts remain unavailable on dealer lots.

The 12V battery drains completely or fails to charge, leaving the vehicle unable to start, unable to shift, unable to unlock doors, and stranded with no electrical power. In several cases, this occurs sporadically and without warning, leaving occupants trapped inside vehicles. Some failures happen in extreme cold where the loss of heat creates a dangerous condition.

When: Can occur with as little as 1.5–2,000 miles; also reported at 50,000–65,000 miles; failures are sporadic and often recur after dealer repair

Symptoms owners cite: Vehicle fails to start; No electrical power to any system; Doors lock and cannot be unlocked from inside or outside; Unable to shift out of park or into neutral; 'Accessory Power Active' or 'Stop Safely Now' messages displayed; Windows fog over (defrost unavailable) in cold conditions; interior has no heat; Clicking sound when jumper cables connected; sparks from battery terminals; Loss of heat in extreme cold (-25 to -40°F)

Codes mentioned: NHTSA Campaign 25V404000, NHTSA Campaign 22V412000

Repairs/costs cited: 12V battery replacement; however, failures often recur after replacement, suggesting a root cause in the charging or control system (HVBJB, ECM, or battery control harness). Ford technicians have attempted to replace ECM module, Battery Control Harness, and HVB junction box on some vehicles. Dealers have reported part shortages and unavailable software updates needed to complete repairs. In one case, owner was trapped inside vehicle and had to be freed by paramedics.

Recalls/TSBs owners mention: Ford issued recall notices and TSBs, but parts for repair remain unavailable for extended periods (weeks to months). One owner reported being stranded mid-repair with no recall parts available after nearly 1 year. Lemon law buyback has been approved in at least one case. Roadside assistance sometimes unable to help due to vehicle architecture (AWD, cannot be put in neutral).

The front camera system or its wiring becomes damaged or fails, disabling adaptive cruise control, lane-keeping assist, automatic braking, pre-collision warnings, and other safety features. Some failures are intermittent; others become permanent. Cable wires can be damaged by bumps in the road, causing the camera to physically drop.

When: Can begin within 6 months of purchase; some failures reported at 12,000–73,000 miles; failures can be intermittent (coming and going) or permanent

Symptoms owners cite: Dashboard alerts: 'Front Camera Fault' or 'Forward Collision Detection Fault'; Adaptive cruise control disabled and cannot be re-enabled; Lane-keeping assist inoperative; Pre-collision assist warnings disabled; Automatic braking not functional; Regular cruise control may also be disabled even when trying to re-enable it; Error messages appear frequently or every time vehicle is started; Camera physically drops after driving over bumps (5–6 times per hour reported); Sudden deactivation of cruise mid-drive causing unexpected regenerative braking

Codes mentioned: TSB 23-2155

Repairs/costs cited: Front camera and/or connecting cables require replacement. Parts must be sourced from Ford and have been on backorder with no ETA provided to dealers. One owner waited months for parts; another reports waiting until end of February with no resolution. Dealers have confirmed the fault but cannot complete repair without OEM parts. Some owners report issue persisting even after dealer service attempts.

Recalls/TSBs owners mention: TSB 23-2155 issued for this defect. However, owners have reported making a dozen or more service visits without permanent resolution. One owner had service completed; error recurred. No recall issued as of narratives provided.

When 12V electrical system fails or battery dies, doors become electrically locked with no mechanical override, trapping occupants inside the vehicle. No warning prior to failure. In one case, an elderly occupant was locked in, became light-headed, fell, and required EMS transport.

When: Occurs at unpredictable times; one case involved a 1-month-old vehicle at 2,000 miles; another at 50,000 miles

Symptoms owners cite: Doors remain locked when electrical system fails; No ability to unlock from inside or outside the vehicle without power; Key fob does not work; Phone-as-Key does not work; Occupants physically trapped until power restored or window broken; No mechanical override or emergency release visible to occupants

Codes mentioned: NHTSA Campaign 25V404000

Repairs/costs cited: Emergency workaround: owners report having to use a portable jumper to jump wires hidden in the bumper (frunk release) and then jump the 12V battery itself. One owner had to smash a window to free an infant. Ford technician confirmed that the only way to manually release doors is through this jumper workaround, which requires knowledge of the location and availability of a jumper nearby. No mechanical lock release exists.

Recalls/TSBs owners mention: NHTSA Campaign 25V404000 issued for electrical system and latches/locks, but parts remain unavailable. One owner at 50,000 miles reported no ETA for software update needed.

Charging port fails to accept full amperage; charging stops unexpectedly mid-session after 30 minutes. Appears linked to temperature sensor failure in charge port. One owner reports dramatic loss of available range (150 miles dropping to 64 miles in less than one minute) and inability to charge at DC fast chargers.

When: Reported early in vehicle ownership; one charge event at 32 amps works; attempts at 48 amps (manufacturer limit) fail within 30 minutes

Symptoms owners cite: Charging unexpectedly stops within 30 minutes when attempting higher amperage (above 32 amps); Charging session only adds 2–3% per session when at higher amperage; Charging port error or temperature fault; Sudden loss of available range (150 miles → 64 miles in <1 minute); DC fast charger rejects vehicle or allows reduced charge rate; Derating to 32 amps allows full charge but severely extends charging time

Repairs/costs cited: Multiple owners report the issue is related to a temperature sensor in the charge port failing prematurely. One owner found a forum with dozens of reports of the same symptom. Diagnosis is straightforward but part replacement appears necessary.

Vehicle experiences sudden loss of propulsion, steering, and brakes during normal driving with multiple error messages. Some failures are one-time events; others recur even after dealer service. No warning prior to failure in some cases.

When: Can occur at low speeds (parking lot at 5 mph) or highway speeds (60–70 mph); reported at 6,000–41,000 miles; some vehicles fail multiple times within weeks of each other

Symptoms owners cite: Sudden complete loss of propulsion mid-drive; Multiple dashboard error messages including 'Shift System Fault', 'Stop Vehicle Safely', 'Power Train Failure - Unsafe to Drive', 'Power Train Malfunction - Reduced Power'; Vehicle speed reduced to 35 or 55 MPH and unable to accelerate further; Loss of steering assist; Loss of braking (pedal goes dead); Vehicle locked in park unable to move; Rear motors chattering before failure

Codes mentioned: NHTSA Campaign 23V687000

Repairs/costs cited: Dealer diagnosis indicates faulty high-voltage battery junction box and/or PCM requiring replacement. However, repair parts often unavailable. One owner had same failure recur twice after dealer repair attempts on two separate occasions.

Recalls/TSBs owners mention: NHTSA Campaign 23V687000 issued for electrical system. However, some vehicle VINs are not included in this recall even though owners report experiencing the identical failures. Manufacturers notified but have not provided assistance on non-recalled VINs.

The Phone-as-Key feature is described as unreliable and still in 'beta stages'. Phone often fails to recognize as key even when Bluetooth is enabled and Fordpass app is open. Feature requires cell signal, making it unreliable in remote areas. Only one physical key fob is supplied with vehicle; second fob costs $300 to purchase and program.

When: Intermittent failures reported from early ownership onward; some failures become more frequent over time

Symptoms owners cite: Phone not recognized as key despite Bluetooth enabled and app open; Requires phone to be in specific position or out of pocket to work; Frequent need to enter backup code instead of using phone key; Feature requires cell signal; does not work in remote areas; Sudden failure to shift out of drive or reverse; requires re-entry of backup code; Rebooting phone, toggling Bluetooth, exiting and re-locking car required to restore function

Repairs/costs cited: Feature has been updated multiple times including dealer-installed software updates, but remains unreliable. No permanent fix provided. Purchasing a second physical key fob costs $300 and must be done through dealer.

Recalls/TSBs owners mention: Software updates have been issued multiple times but have not resolved the issue. Early buyer programs offered free second key fob; later customers told the program has expired and must pay $300. One owner reported being told by Ford dealer that free key fob program was still valid but then was told to pay $300 upon visit.

The fuse panel is located in the frunk and is mounted with the fuse faces pointing away from the user, making it nearly impossible to visually inspect or replace fuses. Small access panel only exposes the back of the fuse box (connectors) not the fuses themselves. Dealers struggle to replace fuses and require dedicated technician time blocks. If a key fuse blows when dealer unavailable, vehicle becomes unsafe with no user remedy available.

When: Becomes an issue whenever a fuse blows

Symptoms owners cite: Blown fuse in 12V power port (cigarette lighter type) in rear hatch; Unable to locate fuse panel without research; Unable to visually inspect fuses or determine which one is blown; Removal of 4–5 plastic panels required to access fuse area

Repairs/costs cited: Dealer must remove multiple plastic panels and dedicate technician time to replace a single fuse. Owner has never seen this design in 50 years of car ownership. Requires appointment with dedicated technician.

Instrument panel display, center console screen, and climate control settings become inoperative. In some cases, display goes completely blank. Loss of access to backup start code entry and climate controls.

When: Reported as intermittent early in ownership and becoming permanent; one case began after recall-related software updates

Symptoms owners cite: Main dash display goes blank or inoperative; Center console/infotainment screen becomes blank; Transmission lights and transmission controls become inoperative; Loss of ability to see and adjust heat/defrost/air conditioning; Loss of ability to enter backup start code (required when phone-as-key fails); Can recover after reset or restart, but issue recurs; One-pedal drive warning messages appear intermittently; Climate control system stops working after recall software updates

Repairs/costs cited: Re-designed console screens available for vehicles built prior to June 2022, but no recall issued as of narrative date. One owner reports issue began immediately after recall-related software updates and required parts on backorder until end of February with extended repair downtime.

Vehicle reports door ajar error without specifying which door. Intruder alerts trigger while vehicle is parked and locked. Passenger door opens on its own after turning off vehicle or even while driving at highway speed.

When: Intermittent issues reported starting early in ownership; highway-speed opening reported in 2022

Symptoms owners cite: Frequent 'door ajar' warning without door indication; Intruder alerts while parked at work with no signs of intrusion or unlocking; Passenger door opens on its own after vehicle shutdown; Passenger door opening while driving at highway speed (driver had to reach over to close it); Door fault alert displayed after starting vehicle

Repairs/costs cited: Dealers report 1-month wait for appointment due to lack of qualified technicians. Failure recurred at 4 weeks after dealer visit initially scheduled.

One-pedal regenerative braking feature becomes inoperative, displaying warning message. Feature resets after overnight parking but can recur during driving, particularly near school zones where sudden loss of one-pedal braking requires rapid transition to traditional two-pedal braking.

When: Occurred after recall-related software updates (Ford Recall 23S56 for HVBJB); can recur during driving

Symptoms owners cite: '1Pedal Drive Fault - Press Brake Pedal To Reduce Speed' warning message; One-pedal regenerative braking function disabled mid-drive; Feature resets after overnight parking; Fault can recur during same drive session; Near school zone with active crosswalks

Repairs/costs cited: Issue appeared after recall work (23S56) and numerous software updates. No permanent fix reported.

Recalls/TSBs owners mention: Ford Recall 23S56 (HVBJB replacement); Multiple software updates performed during same service visit