P CODES (POWERTRAIN) P0100 - P0199 P0110


    The P0110 error code is a diagnostic trouble code that indicates a malfunction in the Intake Air Temperature (IAT) circuit. This circuit is responsible for measuring the temperature of the air entering the engine. When this circuit fails, it can cause a variety of issues, including decreased performance, reduced fuel efficiency, and increased emissions. In this guide, we'll provide step-by-step instructions on how to diagnose and fix the P0110 error code.

    Step 1: Check the IAT Sensor

    The first step in diagnosing the P0110 error code is to check the IAT sensor. The sensor is typically located near the air filter housing or the mass airflow sensor. Using a multimeter, check the resistance of the IAT sensor. The resistance should decrease as the temperature of the sensor increases. If the resistance does not change, or if it is out of the manufacturer's specified range, the IAT sensor needs to be replaced.

    Step 2: Check the Wiring and Connector

    If the IAT sensor is functioning properly, the next step is to check the wiring and connector. Inspect the wiring for any signs of damage or corrosion. Check the connector for any signs of corrosion or loose connections. If the wiring or connector is damaged, it will need to be repaired or replaced.

    Step 3: Check the PCM

    If the IAT sensor and wiring are functioning properly, the next step is to check the Powertrain Control Module (PCM). The PCM is responsible for reading the IAT sensor data and controlling the engine's performance. Using a diagnostic scanner, check the PCM for any stored trouble codes. If the PCM is not receiving the proper signal from the IAT sensor, it may need to be reprogrammed or replaced.

    Step 4: Clear the Error Code

    After repairing or replacing any faulty components, clear the error code using a diagnostic scanner. This will reset the PCM and allow it to relearn the correct IAT sensor data. Start the engine and check for any reoccurrence of the P0110 error code.

    Step 5: Test Drive the Vehicle

    Take the vehicle for a test drive to ensure that the issue has been resolved. Monitor the engine performance and check for any abnormal symptoms, such as decreased performance or increased emissions. If the issue persists, further diagnosis may be required.


    The P0110 error code can be a challenging issue to diagnose and repair. By following these step-by-step instructions, you can identify and fix the root cause of the problem. Always ensure that the vehicle is safe to operate and use caution when working around the engine components.
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