P25AC — Piston Cooling Oil Control Circuit Performance/Stuck Off

What Does P25AC Mean?

P25AC is a diagnostic trouble code indicating: Piston Cooling Oil Control Circuit Performance/Stuck Off. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P25AC

⚠️ Check Engine Light (MIL) illuminated
⚠️ Piston Cooling Oil not meeting expected output
⚠️ Degraded performance of related system
⚠️ Reduced engine performance

Common Causes

🔍 Piston Cooling Oil degraded from age or contamination
🔍 Mechanical wear in Piston Cooling Oil or related parts
🔍 Restriction or blockage affecting Piston Cooling Oil
🔍 Calibration drift in Piston Cooling Oil

Frequently Asked Questions

What does P25AC mean?

P25AC indicates: Piston Cooling Oil Control Circuit Performance/Stuck Off. The vehicle's computer has detected that the Piston Cooling Oil is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P25AC?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P25AC for extended periods may cause additional problems.

How much does it cost to fix P25AC?

Repair costs for P25AC typically range from $50 to $400, 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 Piston Cooling Oil for contamination or wear
🔧 Replace Piston Cooling Oil
🔧 Address any related mechanical faults

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.

P25AC: Piston Cooling Oil Control Circuit Performance/Stuck Off