U0218Lost Communication With Door Switch D
- Generic OBD-II code · Network
- How the car detects it
- U0218 means door switch unit D has gone silent. Rear-door panels are often bus nodes in their own right; on the 2011 Saab 9-5, GM even gives the left and right rear door switch panels separate codes. A detail worth knowing is the window lockout: the driver's panel sends a child-lock bit in its LIN reply, and according to NXP AN2205 the BCM or the individual window modules evaluate this bit and block the rear keys. When a rear panel stops answering, its window can often still be run from the driver's side; if the driver's panel is the one missing, the lockout status may be gone as well. No manufacturer documents U0218 publicly; letter D is assigned per make. No MIL.
- What you may notice
- Window key in one door has no effect
- Same window still moves from the driver's panel
- Rear window lockout behaves unexpectedly
- Likely causes
- LikelyBroken wire in the harness passage to the door
- PossibleMoisture or corrosion at the switch panel connector
- PossibleSwitch panel D failed
- RareBody or door module not polling the panel correctly
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.