Circuit/System Description
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
The battery energy control module measures the internal hybrid battery voltage across the high voltage battery string and in total. If the internal voltage values are out of range at a given battery temperature, this DTC will set.