2021 Ford F-350 SD electrical problems

Filed Jul 8, 2026 · Electrical · MN

I was driving my truck home when it completely shut off, I lost all power to everything, including the power steering brakes. When I got home, I did some research on the Internet to see possible causes. Apparently there is a service bulletin for the fuse box having water getting into it from the cowl of the hood, which states it can do exactly what happened to my truck? You can also keep your truck running and not shutting off and just to hold host of other safety issues with the service bulletin. . So I brought my truck in to get diagnosed by Ford and they did indeed say it was the fuse box under the hood that got water into it and shorted it out. Ford would not cover this part even though I have a factory extended warranty, annoying this is a common issue for 2020 to 2022 Ford trucks they issued a recall on expeditions in a couple other vehicles, but not Ford trucks specifically the super duties. How is this? OK that they don’t tell a customer who purchased a vehicle that this could potentially happen and then when it happens, they refuse to cover anything even though it’s their fault why it happened.

Filed Dec 8, 2025 · Electrical · CA

See attached document for complaint.

Filed Sep 9, 2025 · Electrical · 200,000 miles · TX

The contact owns a 2021 Ford F-350. The contact stated that while driving 65 MPH, the Disconnect/Reconnect message was displayed on the instrument panel. The contact stated that while depressing the brake pedal with the trailer brake control, the system indicated that there was no trailer detected. An independent mechanic was contacted. The vehicle was taken to an independent mechanic to be diagnosed; however, the diagnostic result was unknown. The contact stated that the fuses, wiring harness, and trailer brake control were replaced. The contact related the failure to the federal safety agency Campaign Number: 22V193000 (ELECTRICAL SYSTEM); however, the VIN was not included in the recall. The manufacturer was notified of the issue and informed the contact that a mechanic would be sent to inspect the vehicle. The failure mileage was 200,000.

Filed May 21, 2025 · Electrical · WV

Driver door will not lock or unlock.

Filed Jan 19, 2025 · Electrical, Transmission · PA

Ford knew there was an issue back in 2021 as they so filed with your agency. Yet waited. Then warranty claims continued. Now, four years later they file as a safety issue, BUT have told me twice in phone calls that I can drive the truck, despite it could shut down on it's own while driving. I tow donated RV trailers to the North Carolina disaster, now I cannot as my dealership advised I not go on long trips. Ford refuses a like loaner, or any loaner at all. This is a Ford issue, not mine nor the dealership and Ford needs to either replace all suspected parts, have a resolution now or proved no charge loaners of like kind to all owners. This approach by Ford is totally unacceptable as they in two phone calls to corporate never once said to not drive the truck and the letter I received said they are not advising we park the truck

Filed Sep 24, 2024 · Electrical · TX

Rear center high mount camera on chmsl has stopped working after one year after purchase

Filed Jun 27, 2024 · Brakes, Electrical · TN

On my 21 f350 while towing a 36 foot gooseneck unloaded I noticed a burning wire smell. And I realized I had no more trailer brakes. After diagnosis of the system I found the factory trailer brake controller had melted on the inside. Causing it to loose braking.

Filed Jun 26, 2024 · Driver assistance, Electrical · TN

While driving my 21 F350 my truck would go into limp mode. The climate control stopped working, passenger window stopped, blind spot monitors, along with the mirror. After running forscan it showed every code possible. After an exhaustive search I finally found the main plug under the bed just above the spare tire. The wires inside of the insulation had corroded away to the point it had to be stripped back at least 1/2 inch before getting decent wires that wouldn't crumble when touched. This is a terrible place to put a plug that controls so much.

Filed Nov 13, 2023 · Electrical · 47,000 miles · TX

The contact owns a 2021 Ford F-350. The contact stated that the vehicle failed to shut off upon depression of the START/STOP button after several attempts. While driving to the dealer, several warning lights appeared on the instrument panel. The dealer performed a diagnostic test and discovered that the battery junction box was defective due to moisture intrusion. The manufacturer was notified of the failure and informed the contact that there was no recall on the vehicle. The contact was provided a case number. The vehicle was not repaired. The failure mileage was approximately 47,000.

Filed Aug 14, 2023 · Electrical · 195,200 miles · MI

The contact owns a 2021 Ford F-350. The contact stated that on several occasions while parked, the vehicle was turned off but remained running. The check engine warning light was illuminated. The vehicle was taken to a dealer where it was diagnosed that there was an electrical short due to condensation going into the fuse box. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 195,200.