Conditions for Setting the DTC: P2119
WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. 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 not powered-up, during power down for greater than 0.5 s.