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Our automotive experts have put together the following information about the P009A 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 P009A code.

OBD II Fault Code

  • OBD II P009A

    OBD-II Code Decreased engine performance is defined as a Intake Air Temperature/Ambient Air Temperature Correlation

    The Intake Air Temperature Sensor measures the air temperature going into the engine. The engine control module (PCM) uses this information to determine how much fuel to use to keep the engine running properly. When the PCM detects a problem with this sensor or the circuit for the sensor, it will set code P009A.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P009A Code

    • Intake Air Temperature (IAC) sensor failure
    • Powertrain Control Module (PCM) failure
    • Wiring issue
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