Circuit/System Description
WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The BECM measures the internal hybrid battery resistance across the high voltage (HV) battery string and in pairs. If the internal resistance values are out of range at a given battery temperature, this DTC will set. Higher internal resistance will also increase battery temperature.