U0274
Lost Communication With Lighting Driver Control Module B
U0274 is an OBD-II diagnostic trouble code meaning: Lost Communication With Lighting Driver Control Module B. Common causes: open or short circuit in the can bus, poor contact in the lighting module connectors. Estimated repair cost: $33–167.
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
Error U0274 by Vehicle Brand
FAQ
What does the U0274 code mean?
U0274 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Lighting Driver Control Module B
What causes a U0274 error code?
The most common causes of U0274 include: Open or short circuit in the CAN bus; Poor contact in the lighting module connectors; Lighting control module B fault; Module power problems.
How do I fix a U0274 diagnostic trouble code?
To fix U0274: 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. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0274?
Limited driving only, diagnose soon
How much does it cost to fix U0274?
The estimated repair cost for U0274 is $33–167. Actual cost depends on your vehicle, location, and labor rates.
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