P004C - OBD II Trouble Code

Our automotive experts have put together the following information about the P004C 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 P004C code.

OBD II Fault Code

  • OBD II P004C

    Fault Code Definition

    • Turbocharger/Supercharger Boost Control "B" Circuit Low

    What does this mean? The engine control module (PCM) uses a Boost Control Solenoid to control the turbocharger and provide the requested amount of boost. When the PCM detects an incorrect signal from the Boost Control Solenoid, it will set code P004C.


    • Engine may enter limp home mode (reduced performance)
    • Lack of boost from the turbo/supercharger

    Common Problems That Trigger the P004C Code

    • Boost control solenoid failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

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