P2227 Subaru Barometric Pressure Sensor Range/Performance Problem

Possible causes

– Engine Control Module (ECM) outdated or incorrect software
– Faulty Engine Control Module (ECM)

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Engine rough idle
– Engine hesitation

P2227 Subaru Description

The Barometric Pressure (BARO) sensor is inside the Engine Control Module (ECM). The BARO sensor converts the atmospheric pressure into voltage signal that the ECM uses to modify the basic duration of he fuel injection discharge