Conditions for Setting the DTC: P2119
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects that the throttle is unable to return to the default position after it is de-energized for more than 0.5 second.