U01BD — Lost Communication With DC/DC Converter Control Module C

What Does U01BD Mean?

U01BD is a diagnostic trouble code indicating: Lost Communication With DC/DC Converter Control Module C. This code relates to the network communication system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of U01BD

⚠️ Check Engine Light (MIL) illuminated
⚠️ No communication with DC/DC Converter Control Module C
⚠️ 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 DC/DC Converter Control Module C
🔍 Power or ground supply issue to DC/DC Converter Control Module C
🔍 DC/DC Converter Control Module C internal failure
🔍 Water intrusion damaging module or connectors
🔍 CAN bus termination resistor fault

Frequently Asked Questions

What does U01BD mean?

U01BD indicates: Lost Communication With DC/DC Converter Control Module C. The vehicle's computer has detected that the DC/DC Converter Control Module C is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U01BD?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U01BD for extended periods may cause additional problems.

How much does it cost to fix U01BD?

Repair costs for U01BD 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 DC/DC Converter Control Module C for damage
🔧 Check power and ground supply to DC/DC Converter Control Module C
🔧 Replace failed DC/DC Converter Control Module C

1
Find your vehicle above
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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.

U01BD: Lost Communication With DC/DC Converter Control Module C