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Our automotive experts have put together the following information about the P0408 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 P0408 code.

OBD II Fault Code

  • OBD II P0408

    OBD-II Code Decreased engine performance is defined as a Exhaust Gas Recirculation Sensor "B" Circuit High

    EGR (Exhaust Gas Recirculation) systems are used to reduce the combustion temperature, thus reducing emissions. If the engine control module (PCM) does not detect the amount of flow requested from the EGR, it will set code P0408.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P0408 Code

    • EGR valve failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue

    Common Repairs Needed for the P0408 Code

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