P25AD — Piston Cooling Oil Control Circuit Stuck On

What Does P25AD Mean?

P25AD is a diagnostic trouble code indicating: Piston Cooling Oil Control Circuit Stuck On. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P25AD

⚠️ Check Engine Light (MIL) illuminated
⚠️ Piston Cooling Oil remains active when it should be off
⚠️ Related system running continuously
⚠️ Reduced engine performance

Common Causes

🔍 Piston Cooling Oil mechanically stuck in active position
🔍 Short circuit holding Piston Cooling Oil control on
🔍 Faulty Piston Cooling Oil driver circuit in ECM/PCM

Frequently Asked Questions

What does P25AD mean?

P25AD indicates: Piston Cooling Oil Control Circuit Stuck On. 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 P25AD?

Only short distances if absolutely necessary. P25AD affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix P25AD?

Repair costs for P25AD typically range from $50 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 Piston Cooling Oil for mechanical binding or debris
🔧 Replace stuck Piston Cooling Oil
🔧 Check Piston Cooling Oil control circuit for 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.

P25AD: Piston Cooling Oil Control Circuit Stuck On