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P0937 OBD-II Trouble Code: Hydraulic Oil Temperature Sensor Circuit

Check Engine Light

P0937 code definition

The P0937 indicates that the Powertrain Control Module (PCM) has detected a malfunction in the vehicle's hydraulic oil temperature sensor circuit.

What the P0937 code means

The hydraulic oil temperature sensor keeps tab of the hydraulic fluid temperature, and will report to the PCM if it detects a heat level outside of the manufacturer's set limits. In the case of a P0937 however, the PCM has reason to believe that the malfunction lies with the sensor itself.

What causes the P0937 code?

The temperature sensor's failure to report a voltage input signal back to the PCM is most often the result of faulty, loose, disconnected or corroded wiring. Wiring that has been damaged somehow will impede the sensor's ability to report accurately. In rare circumstances, the PCM itself may be at fault. PCM malfunction is rare, and the cost of replacing one is generally very high when compared to temperature sensor components or simple wiring concerns. Because of this, a problematic PCM should only be considered as a last-resort option once all other potential causes have been exhausted.

What are the symptoms of the P0937 code?

Symptoms may range from erratic warning indicator lamps to an overheating engine. In addition, the OBD-II trouble code will be logged on the computer, and the dashboard trouble indicator lamp will be illuminated. These symptoms are present for a purely diagnostic purpose in order for a technician to pinpoint the problem more easily.

How does a mechanic diagnose the P0937 code?

The first stage of verifying a P0937 trouble code is to read the code using an OBD-II code reader. First off, the temperature sensor itself should be looked over thoroughly for signs of visible damage, as well as tested with a voltmeter to gauge possible internal issues. Next, the wiring running from the oil temperature sensor to the PCM should be looked over thoroughly for signs of disconnection, corrosion, damage or abnormality. Any potentially problematic areas should be noted.

Common mistakes when diagnosing the P0937 code

The temperature sensor may be mistakenly replaced when shoddy wiring is actually to blame for the P0937 code.

How serious is the P0937 code?

If the temperature sensor is the only thing not working, it will result in a number of false warnings from the dashboard lamp. However, if there are real concerns with high hydraulic oil temperature, the resulting heat can damage a vehicle's engine system permanently. It should therefore be considered urgent to repair the P0937.

What repairs can fix the P0937 code?

  • If the oil temperature sensor has been found out as faulty, it should be replaced as needed.

  • Any wiring or connectors that have been cited as corroded, broken, disconnected or faulty should be replaced or repaired accordingly.

  • If other trouble codes related to the hydraulic system have been reported alongside the P0937, they should be addressed before moving onto the sensor concern.

  • If the PCM has been found out as faulty and all other possible options are exhausted, you will need to reprogram or replace the PCM. This is a costly and time consuming ordeal, and should be left in the hands of a trained technician in order to prevent further damage.

  • After completing your repairs in hopes of fixing the P0937, the vehicle should be test driven to see if the trouble code returns. If the code does return, it doesn't mean that your repairs didn't work, only that you may have missed something along the way.

Additional comments for consideration regarding the P0937 code

The model's manual guide should be referenced whenever attempting to repair the vehicle yourself. Each model and manufacturer adheres to different specifications.

Need help with a P0937 code?

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The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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