P0B20 - OBD II Trouble Code

Our automotive experts have put together the following information about the P0B20 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0B20 code.

OBD II Fault Code

  • OBD II P0B20

    OBD-II Code Diagonostic Trouble Code is defined as a Hybrid Battery Pack Voltage Sense "D" Circuit Low

    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 P0B20 is set.

    Common Problems That Trigger the P0B20 Code

    • Battery contactor assembly failure
    • Battery Energy Control Module (BECM) failure

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