DTC P1450: Barometric Pressure Sensor Low/High Input Or DTC P1451: Barometric Pressure Sensor Performance Problem

Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Select DATA LIST mode on scan tool. Observe manifold absolute pressure. If reading is approximately 29.6 in. Hg at sea level, replace PCM. If reading is not approximately 29.6 in. Hg at sea level, check MAP sensor. See DTC P0106  : MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR PERFORMANCE.