2023 Ford Mustang Mach E brakes problems

Filed Aug 31, 2026 · Brakes, Driver assistance · PA

My 2023 Ford Mustang Mach-E GT experienced a sudden electronic parking brake failure. The vehicle displayed a parking brake fault warning, and the electronic parking brake became stuck in the engaged position and would not release despite repeated attempts and restarting the vehicle. The failure completely immobilized the vehicle and required Ford Roadside Assistance to tow it to an authorized Ford dealership. The Ford dealer diagnosed the issue in writing as: “REAR EPB HARNESS CORRODED; STARTING TO CORRODE ON RR AS WELL; RECOMMEND REPLACING BOTH REAR PIGTAILS WITH UPDATED STYLE.” The dealer therefore found corrosion affecting the electronic parking brake wiring on one rear side and corrosion beginning on the other side. Both rear EPB pigtails are being replaced with an updated-style component. This failure appears substantially similar to the electronic parking brake wiring/connector issue Ford previously identified in Customer Satisfaction Program 22P31 for certain earlier Mustang Mach-E vehicles. Ford's documentation for 22P31 states that damage to the EPB wiring can result in a parking brake malfunction and, in some cases, an inability to disengage the parking brake. My 2023 vehicle is apparently not included in that program despite experiencing a very similar failure mode. I am submitting this complaint because corrosion of the electronic parking brake wiring on a relatively new vehicle resulted in the parking brake becoming permanently engaged and the vehicle being completely immobilized. The dealer also found corrosion developing on the opposite-side EPB wiring and recommended replacement of both sides with updated-style pigtails. I believe the federal safety agency should evaluate whether this EPB wiring/connector corrosion condition extends to 2023 Mustang Mach-E vehicles beyond the population originally identified by Ford.

Filed Jul 27, 2026 · Brakes · TX

In the event of a differential pinion shaft failure, the customer may experience a loss of motive power and/or unintended vehicle movement with Park requested if the parking brake is not applied. A loss of motive power or unintended vehicle movement increases the risk of a crash

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 May 25, 2026 · Brakes · MI

Had a warning on my vehicle that said Electric Park Brake fault. Prior year vehicles had this issue that resulted in a recall. When the warning light came on the dealership was able to get the car in and fix it immediately.

Filed Apr 13, 2026 · Brakes · MA

The vehicle parking brake engaged as expected when parked, but would not disengage. Vehicle became inoperable and required a tow to the Ford Dealership. Ford confirmed the cause of the issue was related to a wiring fault, similar to the 2021 and 2022 model years which resulted in Ford issuing Customer Satisfaction Program 22P31. In addition, this failure caused the brake booster module to fail preventing the parking brake from engaging correctly after the wiring was repaired.

Filed Apr 1, 2026 · Brakes · MA

After parking the vehicle, when returning to the vehicle the parking brake would not disengage. The computer reported Parking Brake Fault Service Immediately. Vehicle was not able to be moved and required a tow to the shop as a result. The vehicle is currently being serviced, but speaking with the dealership this is somewhat of a known issue. There were no symptoms or warning signs prior to this. The only potential safety issue about this could have been if the vehicle was parked in an unsafe area and unable to be moved.

Filed Mar 18, 2026 · Brakes, Driver assistance · GA · crash · 1 injury

I was backing out of a parking spot in a strip mall, when I changed the gear to Drive, and moved forward by a foot. I felt a bump, as I appeared to have hit some obstruction on the left underside of the vehicle (likely a low curb/island). After that, I lost control of the vehicle - the car accelerated very hard, and I tried to stop the car, but it was not responding to my brake input. I crashed into a stationary vehicle, which deflected my car to a storefront wall. The total distance travelled from when the sudden acceleration started to the crash against the wall, was probably 20 - 30 feet (and not in a straight line). But the impact was severe enough to have deployed the air bags and the car is considered totalled. Besides the sudden acceleration which did not happen on my input, and the inability of the car to stop based on my brake input, neither did the Forward Collision Warning go off, nor did the Automatic Emergency Braking turn on, to prevent the crash.

Filed Mar 2, 2026 · Brakes · ND

Parking brake fault service required, release parking brake messages when brake is not engaged.

Filed Feb 20, 2026 · Brakes, Driver assistance · MA

Electronic parking brake failure after Massachusetts snow storms and salt. Car is currently at dealership so yes it’s available for inspection at Sentry Ford Medford MA. Yes it’s been reproduced. I was lucky it did not fail engaged so I was able to drive it. Early production 2023 but ford did not recall this model year. Same problem as csp 22p31. Ford currently is not covering this repair even just 500 miles over factory warranty even though all model years around it have the recall. As for the automatic emergency braking it may stop you very short, and hitting the pedal does not override the braking system. Car jerks and seems confused in this situation. I keep turning it off, but the car keeps putting it back on against my wishes. Extremely concerning as it should stay off.

Filed Feb 5, 2026 · Brakes · MI

"Parking Brake Fault - Service Now" warning appeared. Parking brakes locked after stopping vehicle. Dealer diagnosed problem as corroded wiring connector to left rear wheel parking brake motor. Vehicle has 41,000 miles. Vehicle was stuck and could not be moved. If this had occurred in traffic situation a crash could have resulted. Charge to repair was $600 because dealer claimed brake parts are a "wear item".