Conditions for Setting the DTC
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
P2500
The ECM detects low voltage on the generator turn on control circuit for 2 s.
P2501
The ECM detects high voltage on the generator turn on control circuit for 2 s.