U0501Invalid Data Received From Door Control Module B
- Generic OBD-II code · Network
- How the car detects it
- Many cars give each door its own electronics: a door unit receives commands over CAN and drives window lift, lock and mirror, as a Yazaki patent describes with a LIN sub-bus inside the door. Module A has its invalid-data code in U049A; U0501 is the same check for the second door unit. The body controller or another listener gets B's frames, for instance lock status, window position or switch inputs, but finds them implausible, out of sequence or with a bad checksum. Which door B serves is not standardised, and no carmaker documents U0501 publicly. GM's Saab 9-5 list, for one, has no partner entry U0200 for it. Silence from B gives U0200. The driver may notice one door that no longer locks centrally or whose window switch is ignored.
- What you may notice
- One door not following central locking
- Window, mirror or door-ajar display of that door erratic
- Likely causes
- PossibleWater ingress into the door module through a failed door membrane
- PossibleBroken wires in the harness grommet between body and door
- PossibleDoor module not programmed or configured after replacement
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.