DTC Code P1106 – What does this code mean?

<ul> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The illumination of the engine light indicates a detected issue with the barometric pressure sensor. This sensor is crucial for optimal engine performance and fuel efficiency.</li> <li><b>Engine rough idle</b>: A rough idle can occur due to incorrect barometric pressure readings, leading to improper air-fuel mixture adjustments by the engine control unit (ECU).</li> <li><b>Engine hesitation</b>: Engine hesitation during acceleration can be caused by inaccurate barometric pressure data, affecting the ECU's ability to manage engine timing and fuel delivery effectively.</li> </ul>

<ul><li>The Engine Control Module (ECM) may have outdated or incorrect software, leading to improper sensor readings.</li><li>A faulty Engine Control Module (ECM) can cause inaccurate barometric pressure sensor data.</li><li>Wiring issues or poor connections can disrupt the signal from the barometric pressure sensor to the ECM.</li><li>A malfunctioning barometric pressure sensor can provide incorrect data to the ECM.</li><li>Vacuum leaks or intake system issues can affect the barometric pressure readings.</li></ul>

<ul> <li><b>Initial Code Clearing</b>: Clear the P1106 code from the ECM using an OBD-II scanner.</li> <li><b>Engine Warm-Up</b>: Start the engine and hold it at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.</li> <li><b>Test Drive</b>: Test-drive the vehicle with the A/T in 2nd position or M/T in 4th gear. Press the accelerator pedal over halfway down for five seconds.</li> <li><b>Recheck for Codes</b>: After the test drive, use the OBD-II scanner to check for the P1106 code again.</li> <li><b>BARO Sensor Circuit Inspection</b>: If the code returns, inspect the BARO sensor circuit for any loose connections, damaged wires, or corrosion.</li> <li><b>BARO Sensor Testing</b>: Test the BARO sensor using a multimeter to ensure it is within the manufacturer's specified range.</li> <li><b>ECM Reset Procedure</b>: Perform the ECM reset procedure as described: clear the code, start the engine, hold at 3,000 rpm until the radiator fan comes on, let it idle, test-drive, and recheck for codes.</li> <li><b>ECM Replacement</b>: If the P1106 code persists after all tests and procedures, consider replacing the ECM as a last resort.</li></ul>

<p>The DTC code P1106 indicates a Barometric Pressure Sensor Range/Performance Problem. This issue can affect the engine's air-fuel mixture, leading to poor performance and reduced fuel efficiency. Immediate actions should include:</p><ul><li>Inspecting the barometric pressure sensor and its wiring for damage or disconnections.</li><li>Testing the sensor's output to ensure it is within the manufacturer's specifications.</li><li>Replacing the sensor if it is found to be faulty.</li></ul><p>Delaying repair can result in further engine performance issues and potential damage to other components.</p>