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P0AA4 Powertrain

Hybrid Battery Negative Contactor Circuit

BMS detects an electrical fault in the negative HV contactor coil circuit.

Affected components

  • Hv contactor negative
  • Bms

Common causes

  • High likelihood: Contactor coil open

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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