P2186 — Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic

What Does P2186 Mean?

P2186 is a diagnostic trouble code indicating: Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic. This code relates to the powertrain system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P2186

⚠️ Check Engine Light (MIL) illuminated
⚠️ Engine Coolant Temperature Sensor 2 signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Reduced engine performance

Common Causes

🔍 Loose or intermittent connection at Engine Coolant Temperature Sensor 2
🔍 Wire chafing causing intermittent contact
🔍 Engine Coolant Temperature Sensor 2 failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P2186 mean?

P2186 indicates: Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic. The vehicle's computer has detected that the Engine Coolant Temperature Sensor 2 is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P2186?

Yes, P2186 is generally safe to drive with in the short term. However, it should still be addressed to pass emissions testing and prevent potential secondary issues.

How much does it cost to fix P2186?

Repair costs for P2186 typically range from $30 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 reseat all Engine Coolant Temperature Sensor 2 connectors
🔧 Repair chafed or damaged wiring in Engine Coolant Temperature Sensor 2 circuit
🔧 Replace Engine Coolant Temperature Sensor 2 if failing intermittently

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.

P2186: Engine Coolant Temperature Sensor 2 Circuit Intermittent/Erratic