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P0449

Evaporative emission system vent valve/solenoid circuit malfunction

The ECU has detected an electrical malfunction in the EVAP vent valve or solenoid circuit.

What this code means

The ECU has detected an electrical malfunction in the EVAP vent valve or solenoid circuit.

Possible causes

  • Vent solenoid failure
  • Open or short circuit wiring
  • Poor connector contact
  • Control-module driver fault

Common symptoms

  • Check engine light
  • Usually little driveability effect
  • EVAP monitor may not complete

Checks to make

  1. Inspect vent solenoid connector and wiring
  2. Check fuse if applicable
  3. Command the vent valve with a suitable scan tool where supported

Safety

  • Do not replace parts from the code alone. Confirm the fault with live data, wiring checks and manufacturer procedures. Keep clear of hot or moving engine components.

Model notes

The code definition is generic; exact diagnostic thresholds, component locations and repair procedures vary by vehicle.