P0944 Code - Loss Of Hydraulic Pump Prime

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

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  1. fault code

    fault code Administrator Staff Member

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    What does P0944 Mean?

    OBD-II Code P0944 is defined as a Hydraulic Pressure Unit Loss of Pressure

    The transmission uses hydraulic pressure to shift gears. The Transmission uses its own oil pump to build and maintain pressure inside the transmission. If there is a loss of pressure, code P0944 is set.

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    What are the common causes of P0944 ?
    • A faulty oxygen sensor. This will set a code in itself, however, a faulty oxygen sensor does not automatically condemn the sensor. The code just means that the sensor signal was not within specifications. An air leak or any of the above will cause an erroneous signal. There is a multitude of O2 codes relating to O2 performance which gives a clue to the problematic area.
    • Some aftermarket accessories and performance modifications
    • An air leak forward of the DPF will change the sensor readings resulting in the code
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    How do you troubleshoot P0944 ?


    There are a number of possible repairs to fix the P0944 code, including the following:
    • Replacing a faulty pump
    • Replacing a damaged or clogged transmission filter
    • Replacing a damaged internal seal and topping off fluid

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