P0539 — A/C Evaporator Temperature Sensor Circuit Intermittent

What Does P0539 Mean?

P0539 is a diagnostic trouble code indicating: A/C Evaporator Temperature Sensor Circuit Intermittent. This code relates to the vehicle speed and idle control system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P0539

⚠️ Check Engine Light (MIL) illuminated
⚠️ A/C Evaporator Temperature Sensor signal cutting in and out
⚠️ Related system working sometimes but not consistently
⚠️ Erratic idle speed

Common Causes

🔍 Loose or intermittent connection at A/C Evaporator Temperature Sensor
🔍 Wire chafing causing intermittent contact
🔍 A/C Evaporator Temperature Sensor failing under heat or vibration
🔍 Corroded connector pins with partial contact

Frequently Asked Questions

What does P0539 mean?

P0539 indicates: A/C Evaporator Temperature Sensor Circuit Intermittent. The vehicle's computer has detected that the A/C Evaporator Temperature Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P0539?

Yes, P0539 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 P0539?

Repair costs for P0539 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 A/C Evaporator Temperature Sensor connectors
🔧 Repair chafed or damaged wiring in A/C Evaporator Temperature Sensor circuit
🔧 Replace A/C Evaporator Temperature Sensor 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.

P0539: A/C Evaporator Temperature Sensor Circuit Intermittent