DTC P1BBD-00: BMS Overcharge Protection Device Circuit Fault: General Description
WARNING: This page is about a different car, the 2024 Kia Sorento. However, it is still accessible from the selected car via links, so may be relevant.
The OPD (Overvoltage Protection Device) is installed in the high voltage battery pack and monitors the battery cell voltage in case of overcharging. It also protects the battery back even when the BMS control module is deactivated.