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What Does P2040 Code Mean?

    OBD-II Code P2040 is defined as a Reductant Injection Air Pressure Sensor "A" Circuit High

    Code P2040 is set when an issue is detected with the Reductant Injection Air Pressure Sensor. This sensor is part of the Reductant (DEF) System.

    Common Problems That Trigger the P2040 Code

    • Powertrain Control Module (PCM) failure
    • Reductant air pressure sensor
    • Wiring issue
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