Conditions for Setting the DTC (w/TAC): P0122
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 TP sensor 1 voltage is less than 0.3 volt for less than 1 second.