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Our automotive experts have put together the following information about the P029A 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 P029A code.

OBD II Fault Code

  • OBD II P029A

    OBD-II Code Decreased engine performance is defined as a Cylinder 1 - Fuel Trim at Max Limit

    The engine control module (PCM) uses multiple sensors to determine the required amount of fuel needed to keep the engine running efficiently. If the PCM cannot achieve the desired balance between fuel and air, it will set code P029A.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P029A Code

    • Damaged or contaminated spark plug
    • Engine sensor failure
    • Exhaust leak
    • Fuel injector failure
    • Fuel pump failure
    • Internal engine failure
    • Powertrain Control Module (PCM) software needs to be updated
    • The fuel does not meet the manufacturer's requirements

    Common Repairs Needed for the P029A Code

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