U055DInvalid Data Received From Special Purpose Vehicle Control Module D
- Generic OBD-II code · Network
- How the car detects it
- U055D is the last of the four special purpose controller codes. It is stored when frames from controller D reach the network but carry values the receiver rejects. No manufacturer documents it; even Ford, which names slot A in its 2024 summary as a non-MIL check, says nothing about B to D. In practice the code is most likely on heavily converted vehicles with several add-on units, where one controller may feed implausible values after a voltage dip, a partial software update or a wiring change. Unlike U025C, the lost-communication code, the controller is still transmitting, so power and ground are usually present and the content of the data is what needs checking. Driving is not normally restricted.
- What you may notice
- Individual conversion functions fail intermittently
- Fault entry without effect on engine or brakes
- Likely causes
- LikelyIncomplete or interrupted software update of controller D
- PossibleVoltage dip from heavy conversion loads corrupting controller D's output
- RareController D internally faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.