U0277 code meaning
Lost Communication With Seat Control Module K
What U0277 means
Ford uses seat control module K for a second-row seat: on the 2025 Lincoln Navigator, SCMK drives the power seat behind the driver, in SSM 54226 called the rear left-hand power seat module. Its update SCMK-25.5.5.3 was meant to make that seat store its memory positions reliably, and SSM 54226 deals with second-row seats stuck in their longitudinal position, B167F:11 stored in SCMK or SCML, which moved again only after the configuration apps of both modules had been run in FDRS. U0277 itself, the lost-communication code for SCMK, appears in no public bulletin. If set, the left second-row seat cannot be adjusted electrically or recall memory positions; seats in front are unaffected. U0278 is the right-hand module, U0578 invalid data from SCMK.
U0277 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0277
- Left second-row power seat does not move
- Memory positions of that seat not stored or recalled
Common causes of U0277
- Most likelySeat harness or connector under the second-row seat strained or unplugged
- PossibleSCMK not configured or software update incomplete
- PossibleSeat module fuse or supply open
- Less likelySeat control module K internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Seat control module kVehicle bus wiring
What each part of U0277 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 77 | The exact fault in that area. |
What to do next
- Note U0277 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0277
What does U0277 mean?
U0277 means "Lost Communication With Seat Control Module K". Ford uses seat control module K for a second-row seat: on the 2025 Lincoln Navigator, SCMK drives the power seat behind the driver, in SSM 54226 called the rear left-hand power seat module. It is a generic code, so it means the same on every make.
Is it safe to drive with U0277?
U0277 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0277 fail an emissions test?
U0277 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0277 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will U0277 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.