Conditions for Setting the DTC: P0223
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects that the TP sensor 2 voltage is more than 4.7 volts for more than 0.4 second.