Circuit Description

The DTC P1451 Barometric Pressure (BARO) Sensor Performance diagnostic checks the accuracy of the BARO sensor signal. The BARO sensor and circuitry are located inside of the Powertrain Control Module (PCM). The PCM uses the barometric pressure information in order to compensate for altitude changes. The BARO sensor reading is displayed on a scan tool when the ignition switch is On and the engine is OFF.