Conditions for Setting the DTC
WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
The TP sensor 2 voltage is less than 0.282 volts or more than 4.6 volts.
OR
The PCM learns a minimum throttle position of more than 0.813 volts.
OR
The TP sensor reference voltage is less than 0.5 volts.