P0129 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0129 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 P0129 code.

OBD II Fault Code

  • OBD II P0129

    Fault Code Definition

    • Barometric Pressure Too Low

    What does this mean? The engine control module (PCM) uses a Pressure sensor in the intake to determine airflow through the engine. If the PCM detects the signal is too low, it will set code P0129.


    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P0129 Code

    • Internal engine failure
    • Mass Air Flow (MAF) sensor failure
    • The engine is not timing correctly
    • Vacuum leak
    • Wiring issue

    Common Repairs Needed for the P0129 Code

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