P05B4 — Active Grille Air Shutter B Control Circuit Low

What Does P05B4 Mean?

P05B4 is a diagnostic trouble code indicating: Active Grille Air Shutter B Control Circuit Low. This code relates to the vehicle speed and idle control system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P05B4

⚠️ Check Engine Light (MIL) illuminated
⚠️ Active Grille Air Shutter B reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ Erratic idle speed

Common Causes

🔍 Open or broken wire in Active Grille Air Shutter B circuit
🔍 Poor ground connection at Active Grille Air Shutter B
🔍 Faulty Active Grille Air Shutter B with no output signal
🔍 Disconnected or loose Active Grille Air Shutter B connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P05B4 mean?

P05B4 indicates: Active Grille Air Shutter B Control Circuit Low. The vehicle's computer has detected that the Active Grille Air Shutter B is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P05B4?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P05B4 for extended periods may cause additional problems.

How much does it cost to fix P05B4?

Repair costs for P05B4 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 Active Grille Air Shutter B circuit
🔧 Clean and secure Active Grille Air Shutter B connector and ground points
🔧 Replace failed Active Grille Air Shutter 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.

P05B4: Active Grille Air Shutter B Control Circuit Low