Hybrid/EV Battery A Voltage Unstable

Check these first

• Cell voltages inside battery A drift apart under load
• A weak or failed cell within battery A
• A loose or corroded voltage tap on battery A
• Charging system faults letting battery A overcharge or sag
• A failing battery management circuit on battery A

What to do next

1. Scan the hybrid module and read battery A voltage
2. Compare each cell group voltage inside battery A
3. Inspect the battery A voltage taps and connectors for corrosion
4. Load test battery A and check the charging system output
5. Balance the battery A cells or replace the failed cell
6. Clear the code and retest

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