2023 Ford Mustang Mach E: sudden loss of power

Filed Oct 8, 2026 · Electrical, Engine · KS

I am reporting a recurring safety defect involving my 2023 Ford Mustang Mach-E Premium. The defect appears to involve the high-voltage battery system, powertrain system, and High Voltage Battery Junction Box (HVBJB). The vehicle and related components are available for inspection upon request. My vehicle experienced failures on May 28, 2026, June 25, 2026, and October 1, 2026. Prior to each failure, the vehicle displayed "High Voltage Battery Warning" and "Powertrain Malfunction/Reduced Power" messages. Following these warnings, the vehicle became completely inoperable and would not start. This has now occurred three times, indicating a recurring defect rather than an isolated incident. This defect created safety risks for both myself and others. During the first incident on May 28, 2026, the vehicle became inoperable while in the drive-through lane of a busy coffee shop. Because the vehicle could not be started or moved, it blocked access to the drive-through during peak morning and lunch periods, forcing the business to temporarily close the drive-through lane. This created a traffic obstruction and left me stranded. On all three occasions, the vehicle became unusable without warning, creating the risk of being stranded and unable to safely rely on the vehicle for transportation. The vehicle was taken to a Ford dealership after each incident for inspection and diagnosis. Despite multiple service visits, the issue has not been permanently resolved, and the same warnings and failure conditions continue to occur. The vehicle and components have been inspected following each incident; however, no repair has successfully corrected the problem or prevented it from recurring. The repeated occurrence of High Voltage Battery Warning, Powertrain Malfunction/Reduced Power, and HVBJB shutdown conditions that render the vehicle unable to start raises serious concerns about the reliability and safety of the vehicle. I am requesting that the federal safety agency investigate this defect.

Filed Jun 1, 2026 · Brakes, Driver assistance · CA

While I was driving the brakes did not work. I had to slam on the brakes in order to stop the car. The back portion of the car then skid. The following warnings were sent to the phone and appeared on the dashboard as well. There were more on the dashboard but since I was driving I focused on trying to maneuver the car and not reading the dashboard. Not knowing what happened I continued to drive to duplicate the issue. The brakes were consistently only working when slamming on the brakes (and skidding). There was no traffic, allowing us to rely on driving slow speeds and letting the car to come to natural stops. We took it to the dealership immediately who were unable to duplicate. They diagnosed it as a network overload and attempted to release the car back to us. Currently working with a Ford Advocate as a Network Overload will shut our brakes off again. It's just a matter of when. Which is why they can't duplicate it. They can't predict when the Ford Network that communicates to the MachE braking mechanism will overload again. Powertrain malfunction/Reduced power Powertrain system fault Anti brake fault Anti lock brake system fault Brake system Fault Service brakes Electronic Parking Brake Hill start assist warning Hill start assist fault Pre collision assist not available Collision assist unavailable

Filed Oct 13, 2025 · Electrical, Transmission · AL

Car constantly shuts down at electric vehicle charging stations and has even loss power will driving on highway and bought up powertrain fault

Filed Jan 22, 2025 · Engine, Transmission · FL

I was driving along the road at 35 mph when the vehicle lost power and refused to accelerate or keep speed. The cluster flashed a warning indicating "Stop Safely Now", so I pulled over and came to a stop, and I shifted to P. Thereafter, the vehicle shut off and would not start, continuing to indicate to "Service Vehicle Now", as well as additional new errors, including "Service Powertrain", "Full Accessory Power", "Collision Assist Unavailable", and at least 8 other errors that would not go away. Two red lights were indicated on the cluster - one of them looks like a car with a "!" through it, and the other is a wrench. The vehicle is charged every night to 95% using a Level 2 CCS charger directly to the vehicle's charging port, no adapters. The vehicle had 91% battery remaining when this occurred. About 20 minutes after the incident, while waiting for a tow truck, the vehicle went completely dead and all components were unresponsive. The ignition would not activate, the doors would not open, and the open doors would not properly shut (the electronic catch mechanisms were not catching the door to keep it shut). I could not activate the screen to put it into Emergency Tow mode. The vehicle has 17,999 miles and was purchased brand new in September 2023 with 0 miles.

Filed Jul 28, 2024 · Electrical · HI

Complete loss of power while driving on a congested road. Started as a couple error warnings for different systems like the front camera and then all of a sudden told me to pull over immediately. Luckily we had just turned off the highway, but barely got to the side of the road before we lost power. For a little while the accessories worked, but we eventually lost ALL power to include our hazards. Since we were sitting in a very dangerous areas as people off ramped the highway, this put us directly in danger. Ford handled roadside assistance well, but the dealer treated us like a nuisance and despite the car being towed there and they being fore warned, they still acted like we were an annoyance. Despite promising loaner on the phone, when we arrived they decided they had none. We had to threaten turning in the car under Hawaii lemon laws to get assistance. This car has under 300 miles and had a 90% charge. We leased it a month ago. Given the prior complaints, this issue clearly hasn’t been resolved OR this dealer chose to not take care of the recalls.

Filed May 23, 2024 · Acceleration, Fuel system · GA

Car suddently lost power. There no torque. High voltage battery warning came on. Car dontvrespond as expected auddently lost of power.

Filed May 14, 2024 · Transmission · WI

Undocumented, programmed power loss at interstate speed. Power purposely and dangerously reduced at speed due, and is even displayed on the dash board with small "gray" bars within the "Power Gauge". The "Power Gauge" indicates power, regeneration and power reduction level. ***There is no reasoning in the Owners Manual explaining the power reduction.*** l only found this after I purchased the car; "When the system limits the available maximum power, the right side of the gauge shows gray lines representing the proportional reduction in available power."

Filed Feb 12, 2024 · Electrical, Transmission · CA

All I was doing was charging the battery of the car at my house on a level two charger that was provided by Ford. I got a message on my Ford pass saying High voltage Battery warning. The car stopped charging at 59 percent of the battery capacity. The vehicle has only 2800 miles on it. Also got a power train malfunction/ reduced power warning as well and a service wrench when you turn on the car. This high voltage battery warning is a known issue on 2022 as I had it happen to me while driving it in a turn as I own one of those as well. But this is the 2023 that is not recalled. I have parked it outside of my garage as if the battery is getting hot enough to where it will stop charging this puts these vehicles all at the risk of something called thermal runaway. I do now know why this is not mentioned or even talked about with these types of batteries but basically, this happens when one cell goes into thermal runaway from being too hot and can melt the car. This is a huge safety concern. I have complained about it multiple times but have been ignored. I have parked my vehicle outside of my garage as I fear it may go into thermal away. I will take it to the dealer tomorrow. Please fix this NHSTA it's still not fixed. Happened to my 2022 Mustang Mach E with an extended-range battery now it's happening to my 2023 Mustang Mach e with an extended battery neither of which is part of the recall. If this is a known issue you must investigate it NHSTA and make Ford fix the issue not just wait until someone ends up dead this will not be acceptable and every time I have an issue like this and anyone who also has one should complain. Thermal runaway of a battery is a serious issue that can happen to this battery on the car. It is a real concern I have seen a battery much smaller on a helicopter go into thermal runaway it was not very pretty. Please Ford Fix this issue the high-voltage battery issue is already known.

Filed Dec 5, 2023 · Electrical · 2,000 miles · MI

The contact owns a 2023 Ford Mustang Mach-E. The contact stated while driving approximately 35 MPH, a MIL warning illuminated, with the message “Immediate Loss of Power” displayed. The contact stated that the vehicle shut off and the battery was drained. The contact stated that the vehicle stopped and independently shifted to park(P). The contact stated that the hazard lights were not able to be activated. The contact towed the vehicle to a local dealer, where it was diagnosed and determined that the high voltage battery contact had failed and needed to be replaced. The vehicle was not repaired. The contact researched online and related the failure to the federal safety agency Campaign Number: 23V687000 (Electrical System). The manufacturer was informed of the failure. The failure mileage was approximately 2,000.

Filed Nov 1, 2023 · Electrical, Transmission · TX

My vehicle lost power when I was accelerating onto a highway. The car would not go over 35 mph all the way home. There was no warning light until after I attempted to accelerate and was not able to. Ford is saying it’s only 2022 models, but I have a 2023.

Filed Sep 7, 2023 · Electrical, Transmission · 1,317 miles · MI

The contact owns a 2023 Ford Mustang Mach-E. The contact stated that the vehicle failed to start. The contact stated that after five minutes of attempting to start the vehicle, the vehicle started. The contact then stated that a message displayed on the instrument panel “High Voltage Battery warning and to Contact Roadside Assistance” and “Powertrain Malfunction - Reduced Power”. The contact stated that the vehicle decelerated and failed to accelerate while the accelerator pedal was depressed. Limited Power was displayed on the instrument panel. The vehicle was taken to the dealer where the cause of the failure could not be determined. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 1,317.

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

Vehicle suddenly lost power with a warning on the dashboard (service vehicle soon). The component ended up being a high voltage battery junction box (HVBJB) which was replaced by the dealer under warranty. This is a known issue reported on widely on forums such as macheforum.com