OBD
P0B31
Hybrid/EV Battery D Voltage Low
What it means
P0B31 means Hybrid/EV Battery D Voltage Low.
Check these first
- An aged battery D that is not holding charge
- A failed battery D cell
- Corroded battery D connections
- High mileage wearing battery D
What to do next
- Read hybrid battery D voltage on a scan tool
- Check the battery D state of charge
- Test the battery D cells for a failed cell
- Inspect the battery D connections for corrosion
- Replace battery D if the cells test good but voltage stays low
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.