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P0449 Powertrain

Evaporative Emission System Vent Valve/Solenoid Circuit Malfunction

A general electrical fault was detected in the EVAP vent valve/solenoid control circuit. Without a working vent valve the EVAP leak test cannot complete and the system may remain not-ready.

Affected components

  • Evap vent valve
  • Vent valve wiring

Common causes

  • High likelihood: Vent valve electrically failed
  • Medium likelihood: Wiring or connector fault

Possible symptoms

  • Check engine light on
  • Possible smell of fuel near tank or engine bay
  • Failed emissions inspection
  • Loose-cap warning may appear

Diagnostic notes

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

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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