Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

The PCM detects that the difference between the BARO sensor pressure and the MAP sensor pressure is more than 5 kPa when the ignition is ON before engine start-up.
OR
The difference between the BARO sensor pressure and the PCM predicted BARO is more than 60 kPa when the engine is running.
The above conditions are met for 1 second.