The P0109 trouble code indicates an intermittent issue within the manifold absolute pressure (MAP) or barometric pressure sensor circuit. This code typically points to sporadic problems with the sensor responsible for measuring the pressure within the intake manifold or the atmospheric pressure, affecting the engine’s performance.
Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent
Code symptoms P0109.
1. Intermittent engine performance issues.
2. Occasional rough idling or stalling.
3. Fluctuating fuel efficiency.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0109.
1. Faulty manifold absolute pressure (MAP) or barometric pressure sensor.
2. Intermittent wiring or connector issues within the sensor circuit.
3. Intermittent problems with the Engine Control Module (ECM).
Code Solutions P0109.
1. Inspect and replace the manifold absolute pressure (MAP) or barometric pressure sensor if it is faulty.
2. Check for any intermittent wiring or connector issues in the sensor circuit and repair as needed.
3. If intermittent ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.