Conditions for Setting the DTC: P2119
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. 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 when the TAC motor is de-energized for greater than 0.5 s.