U0271Lost Communication With Seat Control Switch Module C
- Generic OBD-II code · Network
- How the car detects it
- Seat control switch module C is a third switch unit with its own electronics that reports key presses to a seat module instead of carrying motor current. No manufacturer documents U0271 publicly, and which seat C serves is unpublished. The link is short but sensitive: on 2022 Ford Edge and Lincoln Nautilus built up to 14 March 2022 a driver seat switch stopped working because four terminals (1, 2, 5, 6) in connector C341F had opened up, and the driver seat module stored B14CE and B14D0 (SSM 50621). A patent on climate-controlled seats describes layouts where the memory seat module acts as LIN master while memory switches in the door report over CAN (US10414302B2). When switch C goes silent, its seat ignores those keys; driving is unaffected.
- What you may notice
- Seat does not move from this switch, other controls normal
- Memory or comfort keys of this seat without function
- Likely causes
- LikelySpread or loose terminals in the switch connector
- PossibleSignal wire between switch and seat module chafed under the seat or in the door
- PossibleSwitch module C without supply or ground
- RareSwitch module C internally faulty
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.