U020BLost Communication With Door Control Module H
- Generic OBD-II code · Network
- How the car detects it
- U020B is the last of the eight door module slots and flags lost contact with door control module H. No manufacturer documents this code publicly, and on ordinary four-door cars the letter stays empty. Where it is assigned, the receiving unit, usually body control module or gateway, misses the cyclic messages of that door unit; the body control module itself keeps locking and lighting alive, so only functions local to that door fail. A loose plug between door and body is the best first suspect: Volkswagen tech tip 97-21-02 links door module dropouts with U019900 or U020000 to poorly seated pins at the A-pillar; that check suits any door unit. U050C is invalid data. No MIL.
- What you may notice
- Window, lock or switches of one door inoperative
- Door ajar or door system warning in the cluster
- Likely causes
- LikelyPoorly seated or corroded pins in the door-to-body connector
- PossibleWire break in the door transition
- RareDoor module H faulty
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.