P0939 Code - Hydraulic Oil Temperature Sensor Circuit Low

Discussion in 'P - Powetrain Codes' started by fault code, Mar 31, 2018.

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    fault code Administrator Staff Member

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    What does P0939 Mean?

    The Transmission Control Module (TCM) monitors the Hydraulic Oil Temperature Sensor. The TCM sets the OBDII code when the Hydraulic Oil Temperature Sensor is not to factory specifications.

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    What are the common causes of P0939 ?
    • An air leak forward of the DPF will change the sensor readings resulting in the code
    • Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
    • Dirty air cleaner element Damaged DPF
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    How do you troubleshoot P0939 ?

    The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0939 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

    Searches related to P0939 Code - Hydraulic Oil Temperature Sensor Circuit Low
    • P0939
    • P0938
     

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