The P0939 trouble code indicates a low voltage condition in the hydraulic oil temperature sensor circuit. This sensor is responsible for monitoring the temperature of the hydraulic oil in the transmission system. A low voltage condition in this circuit can lead to inaccurate temperature readings, potentially causing transmission issues.
P0939 Hydraulic Oil Temperature Sensor Circuit Low
Code symptoms P0939.
1. Fluctuating transmission temperature gauge readings.
2. Transmission overheating.
3. Erratic shifting.
4. Reduced transmission performance.
5. Check Engine Light illuminated.
Causes of the code P0939.
1. Faulty hydraulic oil temperature sensor.
2. Wiring or connector issues in the hydraulic oil temperature sensor circuit.
3. Low transmission fluid level.
4. Hydraulic system leaks.
5. Internal transmission problems.
Code Solutions P0939.
1. Inspect the hydraulic oil temperature sensor for any signs of damage or malfunction and replace if necessary.
2. Check the wiring and connectors in the hydraulic oil temperature sensor circuit for damage or corrosion. Repair or replace any damaged wiring or connectors.
3. Ensure the transmission fluid level is correct and top up if necessary.
4. Inspect the hydraulic system for leaks and repair as needed.
5. If other transmission issues are suspected, perform a thorough diagnosis or seek professional assistance.