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U0276 Lost Communication With Lighting Driver Control Module D

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0276 closes the four-letter block: the controlling module has lost contact with lighting driver control module D. Lincoln names an LDCMD on the 2025 Navigator and updated it in the same over-the-air package as A to C; nothing more about its location is public, and no manufacturer documents U0276. Why a silent driver must not leave the driver in the dark follows from the US lighting standard FMVSS 108: a failure of automatic beam control may not take away manual low and high beam, and an adaptive driving beam must detect its own malfunctions and fall back to manual operation. A fault in module D should therefore cost comfort functions, not basic headlamp light. No MIL.

Likely causes

Connector of module D loose, wet or corroded
Bus line to module D chafed or open
Module D internally faulty

Symptoms

  • Automatic or adaptive high beam deactivated, manual switching still works
  • Lighting warning in the cluster

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–1,200
Time0.3–3 h

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

Parts involved

lighting driver module dvehicle bus wiring

Related codes

U0577U0275U0273

References: static.nhtsa.gov, law.cornell.edu.