P0939

2017-10-10

Description:

  • The fault code P0939 indicates a low input signal detected in the hydraulic oil temperature sensor circuit. The hydraulic oil temperature sensor is responsible for monitoring the temperature of the hydraulic oil in the transmission. A low input signal suggests that the sensor circuit is not detecting the expected voltage or resistance, indicating a potential problem.

Possible Symptoms:

  • Illuminated check engine light

  • Inaccurate or inconsistent hydraulic oil temperature readings

  • Abnormal transmission behavior or shifting issues

  • Transmission overheating or fluid degradation

Possible Causes:

  • Faulty hydraulic oil temperature sensor

  • Short circuit or open circuit in the hydraulic oil temperature sensor circuit

  • Wiring or connector issues in the sensor circuit

  • Malfunctioning transmission control module (TCM)

Related Parts:

  • Hydraulic Oil Temperature Sensor: Hydraulic oil is needed for the gear lubrication system. Hydraulic oil temperature sensor measures the temperature of the oil. This car's sensor has a problem which may cause difficulty in shifting gears

Possible Solutions:

  • Inspect the hydraulic oil temperature sensor for any signs of damage or malfunction, and replace if necessary.

  • Check the wiring and connections in the hydraulic oil temperature sensor circuit, and repair or replace as needed.

  • Ensure the sensor is properly calibrated and positioned for accurate temperature readings.

  • Verify the functionality of the transmission control module (TCM) and replace if necessary.

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