Conditions for Setting the DTC: P0404
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 difference between the EGR Position Sensor and the desired EGR Position is more than 9.5 percent for more than 120 seconds.