Conditions for Setting the DTC: P2119
WARNING: This page is about a different car, the 2008 Suzuki Swift +, 2008 Pontiac Wave, and 2008 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects that the throttle blade did not return to the default position, during power down, within a calibrated amount of time.