Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
P1516
The indicated throttle position does not match the predicted throttle position for more than 0.2 second.
P2101
The indicated throttle position does not match the predicted throttle position for more than 0.1 second.
P2119
The ECM determines that the throttle blade did not return to the rest position within 720 milliseconds.
P2176
The difference between the predicted and the actual throttle position is more than a calibrated amount for more than 1.8 seconds.