OBD II Fault Code

  • OBD II P0099

    OBD-II Code Decreased engine performance is defined as a Intake Air Temperature Sensor 2 Circuit Intermittent/Erratic

    Diesel engines uses an Intake Air Temperature Sensor to measure the temperature of the air going into the charge air cooler. If the engine computer (PCM) determines that the reading from the sensor is not plausible, code P0099 will set.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P0099 Code

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

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