Network, generic

U0273 Lost Communication With Lighting Driver Control Module A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

A lighting driver control module sits in or on a headlamp and powers its LED groups on command from a higher-level lamp or body controller. U0273 means that controller hears nothing from driver module A within its timeout. Lincoln's 2025 Navigator is a documented case: its headlamps use four lighting driver control modules, LDCMA to LDCMD, and module A received over-the-air release LDCMA-25.10.08 to correct colour and brightness at switch-on. GM's 2021 Tahoe and Suburban show that such drivers are separate parts, replaced left and right to fix a bluish daytime light. No maker publishes U0273 itself or which lamp letter A serves. The lamp may keep a basic beam while adaptive or animated functions stop.

Likely causes

Moisture or corrosion at the headlamp connector of driver module A
Driver module A without supply or ground (fuse, splice)
Module software outdated or update interrupted
Driver module A internally faulty (often only with complete headlamp)

Symptoms

  • Lighting warning in the instrument cluster
  • Adaptive high beam, cornering light or light animation unavailable
  • LED segments on one headlamp dark or in a default setting

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 avehicle bus wiring

Related codes

U0574U0274U0241U0542

References: static.nhtsa.gov, static.nhtsa.gov.