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P0AA1 Powertrain

Hybrid Battery Positive Contactor Circuit

BMS detects an electrical fault in the positive HV contactor coil circuit. The contactor connects the battery positive terminal to the high-voltage bus.

Affected components

  • Hv contactor positive
  • Bms
  • Wiring harness

Common causes

  • High likelihood: Contactor coil open
  • Medium likelihood: Wiring fault

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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