Conditions for Setting the DTC

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

The control module detects vacuum during a non-purge condition.
The condition exists for greater than 4 seconds, or for a cumulative of 30 seconds.