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P004A - OBD II Trouble Code

Our automotive experts have put together the following information about the P004A 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 P004A code.

OBD II Fault Code

  • OBD II P004A

    OBD-II Code Powertrain Control Module (PCM) failure is defined as a Turbocharger/Supercharger Boost Control "B" Circuit/Open

    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 P004A.

    Powertrain Control Module (PCM) failure Symptoms

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

    Common Problems That Trigger the P004A Code

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

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