P1504 — Idle Speed Control Valve Closing Solenoid Control Open Circuit

What Does P1504 Mean?

P1504 is a manufacturer-specific diagnostic trouble code: Idle Speed Control Valve Closing Solenoid Control Open Circuit. This code applies to BMW, FORD, LINCOLN, MERCURY, VOLKSWAGEN vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1504

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Idle Speed Control Valve Closing Solenoid Control Open readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Idle Speed Control Valve Closing Solenoid Control Open circuit (damaged, chafed, or corroded)
🔍 Faulty Idle Speed Control Valve Closing Solenoid Control Open connector or terminal
🔍 Failed Idle Speed Control Valve Closing Solenoid Control Open
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P1504 mean?

P1504 indicates: Idle Speed Control Valve Closing Solenoid Control Open Circuit. The vehicle's computer has detected that the Idle Speed Control Valve Closing Solenoid Control Open is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1504?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1504 for extended periods may cause additional problems.

How much does it cost to fix P1504?

Repair costs for P1504 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 Idle Speed Control Valve Closing Solenoid Control Open wiring and connectors
🔧 Replace faulty Idle Speed Control Valve Closing Solenoid Control Open

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.

P1504: Idle Speed Control Valve Closing Solenoid Control Open Circuit