P003A - OBD II Trouble Code

Our automotive experts have put together the following information about the P003A 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 P003A code.

OBD II Fault Code

  • OBD II P003A

    Fault Code Definition

    • Turbocharger/Supercharger Boost Control "A" Position Exceeded

    What does this mean? The Turbocharger Vane Control Solenoid controls the amount of boost produced by the turbocharger. Every time the key is cycled, the engine computer (PCM) runs a self-check to verify the Turbocharger Vane Control Solenoid and related sensors are working properly. The PCM will command the solenoid to fully open and close. If the PCM does not see the Turbocharger Vane Control Solenoid open and close as requested, the PCM assumes that the calibration has been lost or there is another fault with the turbocharger. Code P003A will set.A relearn procedure must be performed any time the Turbocharger or related components are repaired or replaced.


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

    Common Problems That Trigger the P003A Code

    • Manual turbocharger vane position relearn procedure
    • Powertrain Control Module (PCM) failure
    • Turbocharger vane control solenoid failure
    • Turbocharger vane position sensor failure

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