Conditions for Setting the DTC: P0223
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 ECM detects the TP sensor 2 signal voltage is greater than 4.9 volts, then a 5 second delay for MIL ON.