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P0A27 Powertrain

Hybrid/EV Battery Power Off Circuit

The hybrid battery power-off control circuit reports a generic fault. Safe disconnection of the HV system cannot be commanded reliably.

Affected components

  • Hybrid battery power off circuit
  • Main contactors
  • Bms

Common causes

  • High likelihood: Power-off wiring fault
  • Medium likelihood: Main contactor fault
  • 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

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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