U055BInvalid Data Received From Special Purpose Vehicle Control Module B
- Generic OBD-II code · Network
- How the car detects it
- U055B concerns the second slot reserved for special purpose controllers. A receiving module gets frames from controller B, but a signal lies outside its permitted span, a counter or checksum is wrong, or the frame length does not match. No manufacturer documents U055B publicly. How freely these slots are filled shows in Deutz's engine controller for off-highway machines, which reports a timeout of its tractor-trailer bridge under U0259, the lost-communication code of slot A. On road vehicles slot B mainly matters when a conversion carries more than one add-on controller, for example separate units for warning lights and for body hydraulics. U025A is the lost-communication counterpart. Only the conversion equipment is normally affected.
- What you may notice
- One group of conversion functions fails while others still work
- Fault entry in the receiving module, usually without warning lamp
- Likely causes
- LikelySecond add-on controller set up with wrong address or message set
- PossibleSoftware of add-on controller B and vehicle modules not matched
- PossibleUnstable supply or ground at controller B, e.g. on a shared accessory feed
- RareController B 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.