Network, generic

U0271 Lost Communication With Seat Control Switch Module C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

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 No manufacturer documents U0271 publicly, and which seat C serves is unpublished.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.

Likely causes

Spread or loose terminals in the switch connector
Signal wire between switch and seat module chafed under the seat or in the door
Switch module C without supply or ground
Switch module C internally faulty

Symptoms

  • Seat does not move from this switch, other controls normal
  • Memory or comfort keys of this seat without function

Repair estimate

DifficultyEasyDIY possible
Parts and labour€0–400
Time0.2–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

seat control switch module cvehicle bus wiring

Related codes

U0272U0260U0261U0208

References: static.nhtsa.gov, patents.google.com.