P0948 Code - Hydraulic Pump Relay Circuit High

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 P0948 Mean?

    OBD-II Code Transmission may not shift properly is defined as a Hydraulic Pump Relay Circuit Low

    The clutch uses hydraulic pressure to engage and disengage the clutch as well as shift gears. The Transmission Control Module uses a relay to control hydraulic pump that produces the pressure in the system. If the relay does not function as requested, code P0947 is stored.

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    What are the common causes of P0948 ?
    • A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
    • Faulty IMRC actuator relay (if equipped)
    • A large vacuum leak would cause a massive amount of un-metered air to enter the intake manifold resulting in an overly lean mixture.
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    How do you troubleshoot P0948 ?

    The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0948 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 P0948 Code - Hydraulic Pump Relay Circuit High
    • P0948
    • P0949
     

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