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P0939: Hydraulic Oil Temperature Sensor Circuit Low

Severity
High
System
Transmission

What Does P0939 Mean?

P0939 is a diagnostic trouble code indicating: Hydraulic Oil Temperature Sensor Circuit Low. This code relates to the transmission system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of P0939

Common Causes

Frequently Asked Questions

What does P0939 mean?
P0939 indicates: Hydraulic Oil Temperature Sensor Circuit Low. The vehicle's computer has detected that the Hydraulic Oil Temperature Sensor is not operating within its expected parameters and stored this diagnostic trouble code.
Can I drive with code P0939?
Only short distances if absolutely necessary. P0939 affects a critical system and should be diagnosed within a few days to avoid further damage.
How much does it cost to fix P0939?
Repair costs for P0939 typically range from $20 to $500, 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

  • 🔧 Repair broken wire or restore ground in Hydraulic Oil Temperature Sensor circuit
  • 🔧 Clean and secure Hydraulic Oil Temperature Sensor connector and ground points
  • 🔧 Replace failed Hydraulic Oil Temperature Sensor
  1. 1
    Find your vehicle above

    Click your make and model for real owner reports and common causes specific to your vehicle.

  2. 2
    Check for recalls

    Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.

  3. 3
    Get a professional diagnosis

    A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

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