OBD-II Trouble Code Description for P0109 GMC

Manifold Absolute Pressure/Barometric Pressure Circuit Intermittent

What does this mean?

OBD2 Code P0109 GM definition:
The Manifold Absolute Pressure (MAP) sensor provides instantaneous manifold pressure information to the engine’s Engine Control Module (ECM). The data is used to calculate air density and determine the engine’s air mass flow rate, which in turn determines the required fuel metering for optimum combustion. A fuel-injected engine may alternately use a Mass Air Flow (MAF) sensor to detect the intake airflow. A typical configuration employs one or the other, but seldom both.

Symptoms

Possible sumptoms of OBD code P0109 GM
Engine Light ON (or Service Engine Soon Warning Light) Engine rough idle Engine hesitation

Causes

Possible causes of OBD code P0109 GM
– Manifold Absolute Pressure harness is open or shorted – Manifold Absolute Pressure sensor poor electrical circuit connector – Faulty Manifold Absolute Pressure sensor – Faulty Powertrain Control Module (PCM) or Engine Control Module (ECM)

Possible Solutions

Replace and Check any of the Causes listed above