Circuit/System Description
WARNING: This page is about a different car, the 2017 GMC Sierra 1500 and 2017 Chevrolet Silverado 1500. However, it is still accessible from the selected car via links, so may be relevant.
The generator control module also called the starter/generator control module is comprised of the following three control modules; the hybrid/EV powertrain control module 1, 14V power module and the drive motor control module. These three control modules are non serviceable and are part of the generator control module.
This is an internal fault detection of the hybrid/EV powertrain control module 1 and no external circuits are involved.