U025CLost Communication With Special Purpose Vehicle Control Module D
- Generic OBD-II code · Network
- How the car detects it
- U025C is the last of the four lost-communication codes for special purpose controllers and covers unit D. No manufacturer documents it publicly, and none of the published systems names more than one such controller. GM's Universal Vehicle Module passes a subset of J1939 data to third-party devices; those devices read a separate output and are not members of the vehicle network, so their failure would not set a U025x code. Ford's Upfitter Integration System likewise feeds body equipment one way through J1939. A code for slot D therefore suggests a fourth add-on unit that sits directly on the vehicle bus, or a vehicle configuration that expects one. Verify first whether such a unit is fitted at all, then check its supply and bus connection. Driving is normally unaffected; corrupt data from D are U055D.
- What you may notice
- Functions of the fourth conversion unit inoperative
- Code stored without any noticeable complaint
- Likely causes
- LikelyVehicle configuration lists a fourth add-on unit that is not fitted or was removed
- PossibleUnit D without power, ground or bus connection
- RareInternal failure of controller D
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.