B0128DC/AC Converter A High Voltage Power Outlet "B" Circuit/Open
- Generic OBD-II code · Body
- How the car detects it
- B0128 is the open-circuit fault for outlet B. Such a fault has to be told apart from a tripped protective device. In Ford's patent US11043801B2 each socket has a ground-fault interrupter whose breaker opens on a current imbalance and normally needs a manual reset; Ford adds an actuator so it can also be reset from a distance, plus test switches for the interrupters. Ford's SSM 49709 for the 2021 F-150 hybrid shows the everyday side: after the built-in Pro Power test the screen reports a ground fault until the reset button is pressed, which is normal behaviour. So rule out a tripped interrupter before chasing wiring. Where outlet B sits is not published, and no manufacturer documents B0128. Until repaired, socket B gives no power.
- What you may notice
- Socket B dead, ground-fault or outlet message on the screen
- Reset does not restore power to socket B
- Outlet circuits carry 120/240 V AC from a high-voltage source; work only with the system de-energised
- Likely causes
- LikelyFeed to outlet B interrupted at a connector or in the harness
- PossibleGround-fault interrupter of outlet B defective or its reset actuator stuck
- RareMoisture or dirt in socket B
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €60 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.