2021 Ford F-350 SD electrical system problems

13 owner complaints filed with NHTSA name the electrical system on the 2021 Ford F-350 SD — 14% of all complaints for this model year.

Electrical System complaints

14%

share of all complaints

—

median reported incident mileage

0 / 0

crash / fire reports

What owners report

“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…”
filed Jul 8, 2026
“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…”
filed Sep 9, 2025

Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.

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