2008 Saturn Vue OBD2 Code P0B28 Hybrid Battery B Voltage Unstable

OBD II Fault Code

• OBD II P0B28

OBD-II Code High voltage system may not operate is defined as a Hybrid Battery "B" Voltage Unstable

The high voltage battery is composed of many individual battery cells. The Battery Energy Control Module (BECM) monitors all the cells in the high voltage battery pack to make sure they are all contributing equally to the high voltage system. If one cell is determined to be unequally contributing, code P0B28 will be set.

High voltage system may not operate Symptoms

• High voltage system may not operate

Common Problems That Trigger the P0B28 Code

• Battery Energy Control Module (BECM) failure
• High voltage battery assembly failure
• Wiring issue