P2177 or P2179
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 Long Term Fuel Trim Cruise/Accel is greater than 23 percent for 4 seconds, or for a cumulative time of 30 seconds.