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P0477 Powertrain

Exhaust Pressure Control Valve A Low

Exhaust pressure control valve A drive line stuck low — short to ground.

Affected components

  • Exhaust pressure regulator

Common causes

  • High likelihood: Short to ground

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • This code can affect emissions

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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