U3505 — Control Module Input Power B Circuit Low

What Does U3505 Mean?

U3505 is a diagnostic trouble code indicating: Control Module Input Power B Circuit Low. 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 U3505

⚠️ Check Engine Light (MIL) illuminated
⚠️ Control Module Input Power B reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ System warning light illuminated

Common Causes

🔍 Open or broken wire in Control Module Input Power B circuit
🔍 Poor ground connection at Control Module Input Power B
🔍 Faulty Control Module Input Power B with no output signal
🔍 Disconnected or loose Control Module Input Power B connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does U3505 mean?

U3505 indicates: Control Module Input Power B Circuit Low. The vehicle's computer has detected that the Control Module Input Power B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U3505?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U3505 for extended periods may cause additional problems.

How much does it cost to fix U3505?

Repair costs for U3505 typically range from $20 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

🔧 Repair broken wire or restore ground in Control Module Input Power B circuit
🔧 Clean and secure Control Module Input Power B connector and ground points
🔧 Replace failed Control Module Input Power 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.

U3505: Control Module Input Power B Circuit Low