NHTSA Complaint #11615379 — 2022 FORD F-450 SD

Trailer brake controller will randomly announce "trailer wiring fault" and lose all brakes. Brake power will momentarily show requested power then cut off. Trailer has been confirmed ok, works 100% on two other trucks, ground continuity is 100% via plug only, brake wiring and resistance all in spec for 3 Dexter 7000# axles (electric drum) Will randomly cut out after working for days. Usually when needed most. Dealer claims "cannot duplicate" had been to dealer 4x for it, to include a software update. I have a BS in Mechanical Engineering Automotive Concentration from what used to be GMs in house engineering school. (GMI/Kettering) To say I'm intimately familiar with how this should work is an understatement. Also, the manual slider control should just provide requested power to brakes, bypassing any BXM/TCM interlocks. In aviation, if I use a backup brake it bypasses antiskid, anything else. Towing a 21,000 pound trailer in the Mountains when this thing decides to not work is sketchy. It will eventually cause an accident given that it's a widespread issue known to people but magically no recall. If this was an Airbus 321 or Boeing 737 we'd have an Airworthiness Directive at a minimum.