P05FA — Stop-Start Status Signal Circuit Low

What Does P05FA Mean?

P05FA is a diagnostic trouble code indicating: Stop-Start Status Signal 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 P05FA

⚠️ Check Engine Light (MIL) illuminated
⚠️ Stop-Start Status Signal 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 Stop-Start Status Signal circuit
🔍 Poor ground connection at Stop-Start Status Signal
🔍 Faulty Stop-Start Status Signal with no output signal
🔍 Disconnected or loose Stop-Start Status Signal connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does P05FA mean?

P05FA indicates: Stop-Start Status Signal Circuit Low. The vehicle's computer has detected that the Stop-Start Status Signal is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P05FA?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P05FA for extended periods may cause additional problems.

How much does it cost to fix P05FA?

Repair costs for P05FA 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 Stop-Start Status Signal circuit
🔧 Clean and secure Stop-Start Status Signal connector and ground points
🔧 Replace failed Stop-Start Status Signal

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.

P05FA: Stop-Start Status Signal Circuit Low