U0260 code meaning
Lost Communication With Seat Control Switch Module A
What U0260 means
Many power seat switches now contain electronics that scan the keys and report the result over a LIN or multiplex link rather than carrying motor current. A Lear patent describes a seat motor assembly with integrated electronics that talks to an external switch over a one- or two-wire multiplex link. Mercedes shows such a switch failing for series 206 to 297, for example C-, E- and S-Class, GLC and EQS: the door-mounted switch group for seat adjustment (front left: SSE-VL) could remain in sleep mode after a software error, so the seat did not move although the quick test stored no fault; unplugging the switch resets it, new switch software prevents a repeat (LI82.00-P-080029). No manufacturer documents U0260 publicly. When switch module A stops sending, its seat cannot be adjusted from it; switch B is U0261.
U0260 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.2 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0260
- Seat cannot be adjusted with its switch
- Memory, lumbar or massage keys on that switch without function
Common causes of U0260
- Most likelySwitch module software stuck in sleep mode, reset by unplugging and fixed by update
- PossibleLoose or corroded connector or broken wire at the switch in the door or seat trim
- PossibleLIN line to the seat module shorted or open
- Less likelyInternal failure of the switch module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Seat control switch module aVehicle bus wiring
What each part of U0260 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 60 | The exact fault in that area. |
What to do next
- Note U0260 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 U0260
What does U0260 mean?
U0260 means "Lost Communication With Seat Control Switch Module A". Many power seat switches now contain electronics that scan the keys and report the result over a LIN or multiplex link rather than carrying motor current. It is a generic code, so it means the same on every make.
Is it safe to drive with U0260?
U0260 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0260 fail an emissions test?
U0260 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 U0260 to fix?
Difficulty: easy. A typical repair takes 0.2 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will U0260 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.