P0447 low

Evaporative Emission Control System Vent Control Circuit Open

The P0447 code means the vehicle's onboard diagnostic system has detected: Evaporative Emission Control System Vent Control Circuit Open. This is a low severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $60 - $250 (parts and labor)

Try This First ($8 Fix)

Stant 10838 OE Fuel Cap

A cracked or loose gas cap causes 60%+ of EVAP codes. This $8 replacement clears P0442, P0455, and P0457 more often than any other repair.

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Find the Leak

THIKPO Automotive Smoke Machine

If a new gas cap does not clear it, the leak is somewhere in the EVAP plumbing. A smoke machine finds the exact leak -- a cracked hose, bad seal, or stuck vent valve -- in minutes instead of guessing at parts.

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Clear the Code

ANCEL AD310 OBD-II Scanner

Clear the code after the repair. If the light stays off after 50 miles, you just saved $200+ in shop fees.

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Common Symptoms

Check Engine Light illuminated
Difficulty refueling -- pump nozzle clicks off repeatedly
Fuel vapor odor
Failed emissions inspection

Probable Causes (Ranked by Likelihood)

Open circuit in vent valve wiring Very High
Failed vent control solenoid High
Corroded connector at the vent valve Moderate
Damaged ECM vent valve driver circuit Low

Step-by-Step Diagnostic Procedure

Locate the vent valve (usually near the charcoal canister at the rear of the vehicle) and inspect the connector
Check for continuity in the vent valve wiring from the ECM to the valve using a multimeter
Measure vent valve solenoid resistance -- typically 10-30 ohms
Apply 12V directly to the vent valve to confirm operation
Inspect wiring harness along the undercarriage for damage from road debris

Common Fixes by Vehicle

What techs usually find when diagnosing P0447 on specific vehicles — tap your vehicle for the fix and the exact part:

2005-2018 Nissan Altima/Sentra 2.5L QR25DE moderate DIY

P0447 indicates the EVAP vent control valve circuit is open. On Nissan vehicles, the vent valve is located near the charcoal canister by the fuel tank. Road debris and corrosion damage the wiring connector. Check the 2-pin connector for corrosion and repair as needed. If the vent valve coil reads open, replace with Dorman 911-502.

Labor: 30-45 min

Common fix part Dorman EVAP Canister Vent Valve View on Amazon→ Compare fitment at PartsGeek→

2007-2019 Toyota Camry/Corolla 2.5L/1.8L moderate DIY

The EVAP canister close valve (CCV) is mounted near the fuel tank. Inspect the connector and wiring for damage from road debris. On Corolla, the harness runs along the subframe where it is vulnerable to damage. Test the valve with 12V applied directly -- you should hear a click. If no click and open-circuit on the coil, replace the CCV.

Labor: 30 min - 1 hour

Common fix part Dorman EVAP Vent Valve View on Amazon→ Compare fitment at PartsGeek→

2010-2020 Subaru Outback/Forester 2.5L moderate DIY

Subaru mounts the EVAP vent valve near the charcoal canister under the rear of the vehicle. Salt and moisture corrode the connector pins. Disconnect, clean with contact cleaner, and apply dielectric grease. If the valve tests open, replace. Also check for a broken wire at the body-to-frame harness pass-through near the rear axle.

Labor: 30-45 min

Common fix part Dorman EVAP Canister Vent Valve View on Amazon→ Compare fitment at PartsGeek→

Frequently Asked Questions

Can I drive with code P0447?

Yes. The vent valve circuit issue does not affect engine performance. You may notice difficulty refueling if the tank cannot vent properly. Repair before your next emissions test.

Where is the EVAP vent valve located?

The vent valve is typically mounted on or near the charcoal canister, which is usually located under the vehicle near the fuel tank or in the rear wheel well area.

Is P0447 common on Nissan vehicles?

Yes. Nissan vehicles are known for vent valve failures, particularly the Altima and Rogue. The vent valve solenoid on these models tends to fail after 80,000-120,000 miles.