U3019 — Control Module Input Power Circuit B/C Correlation

What Does U3019 Mean?

U3019 is a diagnostic trouble code indicating: Control Module Input Power Circuit B/C Correlation. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of U3019

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Control Module Input Power readings
⚠️ Related system operating intermittently
⚠️ System warning light illuminated

Common Causes

🔍 Wiring issue in Control Module Input Power circuit (damaged, chafed, or corroded)
🔍 Faulty Control Module Input Power connector or terminal
🔍 Failed Control Module Input Power
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does U3019 mean?

U3019 indicates: Control Module Input Power Circuit B/C Correlation. The vehicle's computer has detected that the Control Module Input Power is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U3019?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U3019 for extended periods may cause additional problems.

How much does it cost to fix U3019?

Repair costs for U3019 typically range from $80 to $300, 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 and repair Control Module Input Power wiring and connectors
🔧 Replace faulty Control Module Input Power

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.

U3019: Control Module Input Power Circuit B/C Correlation