U0273Lost Communication With Lighting Driver Control Module A
- Generic OBD-II code · Network
- How the car detects it
- 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.
- What you may notice
- 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
- Likely causes
- LikelyMoisture or corrosion at the headlamp connector of driver module A
- PossibleDriver module A without supply or ground (fuse, splice)
- PossibleModule software outdated or update interrupted
- RareDriver module A internally faulty (often only with complete headlamp)
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.