The input value of this sensor is compared to a reference voltage (usually 5V for most applications), and should a deviation from the expected value exist for a period of four consecutive seconds on most applications, the PCM will set code P2227, and illuminate a warning light.Īs its name suggests, the function of the Barometric Pressure Sensor is to provide input data to the PCM with regards to the current atmospheric pressure, which changes (decreases) relative to the atmospheric pressure at sea level as the vehicle gains altitude. OBD II fault code P2227 is a generic code that is defined as “Barometric pressure (BARO) sensor- range/performance problem”, and is set when the PCM (Powertrain Control Module) detects a reading from the Barometric Pressure Sensor that is incompatible or irreconcilable with the current engine load and throttle opening, or when its data does not correlate with that of the MAP (Manifold Absolute Pressure) sensor.
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