P0034 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0034 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 P0034 code.

OBD II Fault Code

  • OBD II P0034

    Fault Code Definition

    • Turbocharger/Supercharger Bypass Valve Control Circuit Low

    What does this mean? The Turbo/Supercharger bypass valve diverts remaining boost out the exhaust when the driver lets off the accelerator pedal. When the vehicle's control module (PCM) detects an incorrect signal from the sensor, the PCM will set code P0034.This may send the vehicle into "limp home mode", limiting the amount of power out of the engine, to protect other components from being damaged.


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

    Common Problems That Trigger the P0034 Code

    • Powertrain Control Module (PCM) failure
    • Wastegate solenoid failure
    • Wiring issue

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