B0129DC/AC Converter A High Voltage Power Outlet "C" Circuit/Open
- Generic OBD-II code · Body
- How the car detects it
- B0129 covers outlet C. Apart from wiring faults, the converter also cuts sockets on purpose when the load is too high. Ford's patent US11043801B2 gives limits of 20 A for the 120 V sockets and 30 A for the 240 V socket, and when total power exceeds the ceiling it de-energises sockets by priority, the lowest first. Ford's SSM 51498 for the 2023 Super Duty describes the resulting Pro Power Onboard Turned Off message after wattage thresholds were exceeded, which could only be cleared once the load was unplugged. A shutdown like that is not an open circuit: B0129 means the converter finds no intact path to socket C. Which socket that is, and any maker using B0129, is not public.
- What you may notice
- Socket C stays dead even with no load connected
- Outlet message that cannot be cleared by unplugging and resetting
- Outlet circuits carry 120/240 V AC from a high-voltage source; work only with the system de-energised
- Likely causes
- LikelyTerminal at outlet C overheated or burnt from heavy loads, contact lost
- PossibleHarness to outlet C open
- RareSwitching element for outlet C inside the converter defective
- 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.