P1903 — Pressure Control Solenoid "C" Short Circuit

What Does P1903 Mean?

P1903 is a manufacturer-specific diagnostic trouble code: Pressure Control Solenoid "C" Short Circuit. This code applies to OTHER, FORD, LINCOLN, MERCURY 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 P1903

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Pressure Control Solenoid "C" Short readings
⚠️ Related system operating intermittently
⚠️ Reduced engine performance

Common Causes

🔍 Wiring issue in Pressure Control Solenoid "C" Short circuit (damaged, chafed, or corroded)
🔍 Faulty Pressure Control Solenoid "C" Short connector or terminal
🔍 Failed Pressure Control Solenoid "C" Short
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does P1903 mean?

P1903 indicates: Pressure Control Solenoid "C" Short Circuit. The vehicle's computer has detected that the Pressure Control Solenoid "C" Short is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1903?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1903 for extended periods may cause additional problems.

How much does it cost to fix P1903?

Repair costs for P1903 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 Pressure Control Solenoid "C" Short wiring and connectors
🔧 Replace faulty Pressure Control Solenoid "C" Short

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.

P1903: Pressure Control Solenoid "C" Short Circuit