U0274

Lost Communication With Lighting Driver Control Module B

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–167 (est.)

Symptoms

Auxiliary lighting functions not working
Error message on the dashboard
Incorrect operation of automatic lighting
Flashing or unstable headlights

Causes

Open or short circuit in the CAN bus
Poor contact in the lighting module connectors
Lighting control module B fault
Module power problems
Corroded contacts or damaged wiring

How to Fix

Check power and ground of lighting control module B
Inspect connectors and wiring for damage
Check the integrity of the CAN bus with a multimeter
Scan other modules for related codes
If necessary, replace the faulty module

Related codes

U0273 U0275 U0254