U051AInvalid Data Received From Door Switch E
- Generic OBD-II code · Network
- How the car detects it
- U051A concerns door switch unit E. On a car with four side doors, A to D would already be enough for one unit per door, so E suggests an additional switch location; no manufacturer documents this code or says what E means. Rear or sliding doors with their own electronics are plausible candidates: Yazaki's patent US8304928 describes doors with dedicated controllers, each serving a window switch module, joined to the body network through a LIN sub-bus. One interaction matters for any rear switch: the driver's window lockout blocks rear requests deliberately, so a rear switch that does nothing is not by itself a fault. The code becomes meaningful when frames from unit E contain implausible values; U0219 indicates the unit has gone silent.
- What you may notice
- Switch at an additional door position without function
- Window at that position operable only from the driver's door
- Likely causes
- PossibleSwitch unit E internally faulty or water-damaged
- PossibleFault on the LIN sub-bus wiring between door controller and switch
- RareSwitch variant not matching the vehicle configuration
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.