U0274 — Lost Communication With Lighting Driver Control Module “B”

What Does U0274 Mean?

U0274 is a diagnostic trouble code indicating: Lost Communication With Lighting Driver Control Module “B”. This code relates to the manufacturer-specific network system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of U0274

⚠️ Check Engine Light (MIL) illuminated
⚠️ No communication with Lighting Driver Control Module “B”
⚠️ Multiple warning lights may illuminate simultaneously
⚠️ Related system completely inoperative
⚠️ Multiple warning lights on dashboard

Common Causes

🔍 CAN bus wiring fault (open or shorted) to Lighting Driver Control Module “B”
🔍 Power or ground supply issue to Lighting Driver Control Module “B”
🔍 Lighting Driver Control Module “B” internal failure
🔍 Water intrusion damaging module or connectors
🔍 CAN bus termination resistor fault

Frequently Asked Questions

What does U0274 mean?

U0274 indicates: Lost Communication With Lighting Driver Control Module “B”. The vehicle's computer has detected that the Lighting Driver Control Module “B” is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U0274?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U0274 for extended periods may cause additional problems.

How much does it cost to fix U0274?

Repair costs for U0274 typically range from $80 to $1200, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect CAN bus wiring to Lighting Driver Control Module “B” for damage
🔧 Check power and ground supply to Lighting Driver Control Module “B”
🔧 Replace failed Lighting Driver Control Module “B”

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

U0274: Lost Communication With Lighting Driver Control Module “B”