Conditions for Setting the DTC

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

The control module 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 startup.
OR
The difference between the BARO sensor pressure and the control module predicted BARO is more than 60 kPa when the engine is running.
The above conditions are met for 1 second.