U301E — Control Module Wake-up Circuit B/Open

What Does U301E Mean?

U301E is a diagnostic trouble code indicating: Control Module Wake-up Circuit B/Open. 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 U301E

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Control Module Wake-up readings
⚠️ Related system operating intermittently
⚠️ System warning light illuminated

Common Causes

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

Frequently Asked Questions

What does U301E mean?

U301E indicates: Control Module Wake-up Circuit B/Open. The vehicle's computer has detected that the Control Module Wake-up is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U301E?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U301E for extended periods may cause additional problems.

How much does it cost to fix U301E?

Repair costs for U301E 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 Wake-up wiring and connectors
🔧 Replace faulty Control Module Wake-up

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.

U301E: Control Module Wake-up Circuit B/Open