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 5-volt reference 2 voltage is more than 4.7 volts or less than 4.4 volts for longer than 10 seconds.
This diagnostic runs continuously.