Faulty Barometric Pressure (BARO) sensor
Faulty Manifold Absolute Pressure (MAP) sensor
Manifold Absolute Pressure sensor harness open or shorted to ground
Manifold Absolute Pressure sensor circuit poor electrical connection
Engine mechanical problems
Engine Light ON (or Service Engine Soon Warning Light)
The barometric pressure (BARO) sensor measures the pressure of the atmosphere. This pressure is affected by altitude and weather conditions. A diaphragm within the BARO sensor is displaced by the pressure changes that occur from varying altitudes and weather conditions. The sensor translates this diaphragm action into the voltage signal input that is used by the Powertrain Control Module (PCM) for diagnostics and emissions control. At power-up the Powertrain Control Module performs the following rationality test, the manifold pressure is compared with barometric pressure. If the two do not correlate and it cannot be determined which sensor is faulty, then this Diagnostic Trouble Code (DTC) is set.