Conditions for Setting DTC: P2125
WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The ECM detects that the APP sensor 2 voltage is less than 0.33 volt or more than 4.5 volts for more than or equal to 12.5 milliseconds.