P25AF — Coolant Temperature Control Module Requested MIL Illumination

What Does P25AF Mean?

P25AF is a diagnostic trouble code indicating: Coolant Temperature Control Module Requested MIL Illumination. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P25AF

⚠️ Check Engine Light (MIL) illuminated
⚠️ Coolant Temperature Control Module Requested MIL Illumination not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty Coolant Temperature Control Module Requested MIL Illumination
🔍 Wiring or connector issue in Coolant Temperature Control Module Requested MIL Illumination circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P25AF mean?

P25AF indicates: Coolant Temperature Control Module Requested MIL Illumination. The vehicle's computer has detected that the Coolant Temperature Control Module Requested MIL Illumination is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P25AF?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P25AF for extended periods may cause additional problems.

How much does it cost to fix P25AF?

Repair costs for P25AF 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 Coolant Temperature Control Module Requested MIL Illumination and related wiring
🔧 Replace faulty Coolant Temperature Control Module Requested MIL Illumination

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.

P25AF: Coolant Temperature Control Module Requested MIL Illumination