P0004 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0004 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0004 code.

OBD II Fault Code

  • OBD II P0004

    Fault Code Definition

    • Fuel Volume Regulator Control Circuit High

    What does this mean? The Fuel Volume Regulator allows the fuel system to release excessive fuel from the engine back to the fuel tank. When the engine control module (PCM) determines that the Fuel Volume Regulator is not sending back the proper voltage signal, the PCM will set code P0004.


    • Decreased engine performance
    • Engine may stall
    • Increased fuel consumption

    Common Problems That Trigger the P0004 Code

    • Fuel volume regulator failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

    Common Repairs Needed for the P0004 Code

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