P0449 - EVAP Vent Valve Circuit

EVAP vent valve/solenoid circuit fault detected.

Code Overview

EVAP vent valve/solenoid circuit fault detected.

Common Causes

• Failed EVAP vent valve or solenoid
• Wiring or connector fault in the vent control circuit
• Poor power or ground supply to the vent valve
• Vent-circuit fault causing the valve not to respond

Symptoms

• Check-engine light with no major drivability complaint
• Fuel tank may be slow or difficult to fill
• Failed emissions readiness or inspection

Diagnostic Steps

1. Inspect the vent-valve connector and nearby wiring for damage or corrosion
2. Verify power, ground, and control signal at the vent valve
3. Command the vent valve with the scan tool and verify response if supported
4. Check valve resistance and confirm the circuit fault before replacing parts

Repair Difficulty

Moderate

General difficulty estimate for the most common repair path.

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.