U0278Lost Communication With Seat Control Module L
- Generic OBD-II code · Network
- How the car detects it
- Seat control module L is the right-hand partner of K. On the 2025 Lincoln Navigator, Ford's SCML runs the second-row power seat on the passenger side; release SCML-25.5.5.3 targeted its memory function, and SSM 54226 lists it as the rear right-hand power seat module, with its own configuration app that must be run after a module change, for example when the seat ignores its fore-aft switch. U0278 signals that SCML has dropped off the network entirely, which no public bulletin covers for this code. Under-seat harnesses on sliding second-row seats are flexed with every adjustment, so connectors and wiring there deserve the first look. Only the right second-row seat loses its electrical functions.
- What you may notice
- Right second-row power seat inoperative
- Seat memory on that seat not working
- Likely causes
- LikelyHarness under the sliding seat damaged by seat movement
- PossibleSCML configuration missing after replacement or update
- PossiblePower or ground to SCML interrupted
- RareSeat control module L internally faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.