U01BDLost Communication With DC/DC Converter Control Module C
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- Electrified cars may carry several DC/DC converters, each turning one direct voltage into another: the main unit supplies the 12 V system from the traction battery, others feed 48 V consumers or single heavy loads. Vitesco, for instance, added a dedicated DC/DC converter in high-voltage hybrids purely to power the electrically heated catalyst. U01BD means the third converter module, C, has stopped communicating, so the hybrid or vehicle controller loses its status, voltage and current readings. No manufacturer documents this code publicly. Ford's 2014 OBD list carries the sibling U0298 for converter A without a MIL flag, a hint that such codes stay non-MIL unless the converter serves an emissions function. Expect an electrical system warning and load shedding; U0298 and U0299 cover A and B.
- What you may notice
- Electrical system or 12 V warning
- Comfort loads switched off to save energy
- Likely causes
- LikelyLow-voltage supply, wake-up line or connector of converter C faulty
- PossibleConverter shut down by an open high-voltage interlock or contactor state
- RareDC/DC converter C control electronics faulty
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €0 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.