WOMS
P code powertrain Medium severity

P0937 Hydraulic Oil Temperature Sensor Circuit

The OBD2 code P0937 indicates a problem with the hydraulic oil temperature sensor circuit, specifically that the sensor is reporting a temperature that is too low or outside the expected range

Definition

The OBD2 code P0937 indicates a problem with the hydraulic oil temperature sensor circuit, specifically that the sensor is reporting a temperature that is too low or outside the expected range

Common causes

  • Faulty hydraulic oil temperature sensor
  • Damaged wiring or connectors
  • Short circuit in the sensor circuit
  • Open circuit in the sensor circuit
  • Poor ground connection
  • Low hydraulic fluid level
  • Contaminated hydraulic fluid
  • Malfunctioning transmission control module (TCM)

Common misdiagnoses

  • Transmission fluid issues
  • Faulty transmission control module (TCM)
  • Wiring or connector problems
  • Faulty hydraulic oil temperature sensor
  • Transmission overheating
  • Low transmission fluid level
  • Faulty engine control module (ECM)
  • Incorrect transmission fluid type

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are multiple issues

  2. 2. Inspect the Wiring and Connectors

    Visually inspect the wiring and connectors associated with the hydraulic oil temperature sensor. Look for

  3. 3. Damaged, frayed, or corroded wires

  4. 4. Loose or corroded connectors

  5. 5. Repair or replace any damaged components as necessary

  6. 6. Test the Hydraulic Oil Temperature Sensor

    Use a multimeter to test the resistance of the hydraulic oil temperature sensor. Compare the readings to the specifications provided in the vehicle’s service manual

  7. 7. If the sensor is out of specification, it may need to be replaced

  8. 8. Check the Sensor Circuit

    With the multimeter, check the voltage supply to the sensor and the ground circuit. Ensure that the sensor is receiving the correct voltage and that the ground is solid

  9. 9. If there is no voltage or a poor ground, trace the circuit back to the power source or ground point

  10. 10. Inspect the Transmission Fluid

    Check the transmission fluid level and condition. Low or contaminated fluid can affect sensor readings and overall transmission performance

  11. 11. If the fluid is low, top it off with the correct type of fluid. If it is dirty or burnt, consider a fluid change

  12. 12. Check for Short Circuits

    Inspect the wiring harness for any signs of short circuits or grounding issues that could affect the sensor's operation

  13. 13. Clear the Codes and Test Drive

    After performing repairs or replacements, clear the trouble codes using the OBD-II scanner

  14. 14. Take the vehicle for a test drive to see if the code returns. Monitor the transmission performance and check for any abnormal behavior

  15. 15. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the hydraulic oil temperature sensor or transmission issues for your specific vehicle make and model. Manufacturers may have specific recommendations or known issues

  16. 16. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking help from a professional mechanic or technician who has experience with transmission systems and OBD-II diagnostics. By following these troubleshooting steps, you can systematically identify and resolve the issue related to the P0937 code