P2CF1 — Auxiliary Thermostat B Stuck Open

What Does P2CF1 Mean?

P2CF1 is a diagnostic trouble code indicating: Auxiliary Thermostat B Stuck Open. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P2CF1

⚠️ Check Engine Light (MIL) illuminated
⚠️ Auxiliary Thermostat B Stuck Open not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ System warning light illuminated

Common Causes

🔍 Faulty Auxiliary Thermostat B Stuck Open
🔍 Wiring or connector issue in Auxiliary Thermostat B Stuck Open circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P2CF1 mean?

P2CF1 indicates: Auxiliary Thermostat B Stuck Open. The vehicle's computer has detected that the Auxiliary Thermostat B Stuck Open is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P2CF1?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P2CF1 for extended periods may cause additional problems.

How much does it cost to fix P2CF1?

Repair costs for P2CF1 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 Auxiliary Thermostat B Stuck Open and related wiring
🔧 Replace faulty Auxiliary Thermostat B Stuck 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.

P2CF1: Auxiliary Thermostat B Stuck Open