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P0B31 Powertrain

Hybrid/EV Battery D Voltage Low

The voltage of HV battery D is below the expected window. Cell-group depleted, deeply aged, or sense fault.

Affected components

  • Hv battery d
  • Bms

Common causes

  • High likelihood: Cells in group aged - capacity reduced
  • Medium likelihood: Deep discharge event
  • Low likelihood: Pack cell imbalance approaching service threshold

Possible symptoms

  • EV/hybrid system warning light on
  • Reduced power output or limp mode
  • Charging may fail or be slowed
  • Reduced electric range

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • Reduced-power or limp mode may occur

Related codes

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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