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P0A09 Powertrain

DC/DC Converter Status Circuit

The hybrid control module detects an electrical fault on the DC/DC converter status feedback line. This converter steps high-voltage battery output down to 12 V for the auxiliary system.

Affected components

  • Dc dc converter
  • High voltage battery
  • Wiring harness

Common causes

  • High likelihood: DC/DC converter internal fault
  • Medium likelihood: Communication loss with converter

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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