P003B - OBD II Trouble Code

Our automotive experts have put together the following information about the P003B 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 P003B code.

OBD II Fault Code

  • OBD II P003B

    Fault Code Definition

    • Turbocharger/Supercharger Boost Control "B" Position Exceeded

    What does this mean? The engine control module (PCM) uses sensors to determine if the Turbocharger/Supercharger is providing the requested amount of boost. If the PCM determines that the requested amount of boost is not being provided, the PCM will set code P003B.


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

    Common Problems That Trigger the P003B Code

    • Brake booster pressure sensor failure
    • Powertrain Control Module (PCM) failure
    • Turbo/supercharger control solenoid failure
    • Wiring issue

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