DTC P1109: Barometric Pressure (BARO) Sensor Circuit Out of Range-High: General Description

The barometric pressure (BARO) sensor is built into the engine control module (ECM) and monitors atmospheric pressure. The ECM estimates appropriate intake airflow from the manifold absolute pressure (MAP) sensor output voltage and BARO sensor output voltage. When BARO sensor output voltage is outside of the normal specified range, a malfunction is detected and a DTC is stored.