Possible Causes

WARNING: This page is about a different car, the 2003 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

Possible causes are:

DTC P2111

Lock throttle control motor during control throttle control motor (stuck open).

DTC P2112

Lock throttle control motor during control throttle control motor (stuck closed).
Defective throttle control motor circuit.
Defective throttle control motor.
Defective throttle body.
Defective throttle valve.