DTC P1451: Barometric Pressure Sensor Performance Problem: Condition

DTC is set when difference between barometric pressure reading and intake manifold absolute pressure reading is 7.7 in. Hg or higher. This circuit is monitored once per drive cycle. MIL is illuminated when Engine Control Module (ECM) detects malfunction during 2 consecutive drive cycles. Possible causes are:

• Manifold Absolute Pressure (MAP) sensor malfunction.
• ECM malfunction.