OBD-II Code Diagonostic Trouble Code is defined as a Hybrid Battery Pack Voltage Sense "D" Circuit Intermittent/Erratic
The hybrid battery pack is composed of many individual battery cells (sometimes over 300 cells). Those cells are then grouped together. each group has a voltage monitor attached to it that tells the battery control module (or hybrid powertrain control module) the available voltage for each cell group. If a cell group's voltage is implausible, code P0B22 is set.