P0446 means the ECU has detected a problem with the EVAP vent control circuit. The vent valve controls airflow through the charcoal canister that captures fuel vapours. When the valve or its circuit fails, the EVAP system cannot properly purge or seal, triggering this code.
P0446 means the ECU has detected a problem with the EVAP vent control circuit. The vent valve controls airflow through the charcoal canister that captures fuel vapours. When the valve or its circuit fails, the EVAP system cannot properly purge or seal, triggering this code.
P0446 est un code defaut lie a systeme evap, classe en gravite low. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P0446 et allume le voyant moteur.
Si ton vehicule a declenche P0446, tu peux remarquer un ou plusieurs de ces symptomes :
Voici les causes les plus courantes de P0446, classees selon la probabilite qu'elles soient en cause :
En general oui, pour des trajets courts. Completely safe to drive. The EVAP system controls fuel vapour emissions and has no effect on engine performance or safety. The only consequence is a lit check engine light and emissions test failure.
Suis ces etapes pour identifier la cause profonde de P0446 :
Les couts de reparation de P0446 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
P0446 se comporte differemment selon ton vehicule. Selectionne ta voiture ci-dessous pour des causes propres au modele, les problemes connus et des estimations de couts ajustees :
2007-2024
Toyota Camry EVAP vent valves are located near the charcoal canister at the rear of the vehicle. The valve is a simple two-wire solenoid. Toyota's EVAP self-test runs during specific drive conditions, so the code may take several drive cycles to appear or clear. Common on high-mileage Camrys in humid climates where corrosion affects the valve connector.
2006-2024
Honda Civics have the EVAP vent valve integrated near the fuel tank. Access may require partial removal of rear interior trim or underbody panels. The 2016+ 1.5T models have a revised EVAP system. Honda's EVAP testing is sensitive, so even minor connector issues can trigger P0446.
Couts estimes pour les proprietaires de Honda Civicajuste a la baisse par rapport a la moyenne en raison du prix des pieces specifiques a Honda
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
2005-2024
VW EVAP systems use an N80 purge valve and a separate vent valve. P0446 on the Golf typically points to the vent valve near the charcoal canister. On some model years, the canister is mounted inside the rear bumper area, making access tight. The N80 purge valve is a separate component and triggers different codes (P0441, P0443).
Couts estimes pour les proprietaires de Volkswagen Golfajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a Volkswagen
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
2006-2024
BMW EVAP systems are more complex than most, with multiple valves and a fuel tank leak detection pump. P0446 on a BMW may also involve the leak detection pump or its associated wiring. The charcoal canister and vent valve are typically accessible from under the rear of the car. BMW-specific scan tools provide more detailed EVAP test results than generic OBD2 scanners.
Couts estimes pour les proprietaires de BMW 3 Seriesajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a BMW
Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.
Ces codes apparaissent souvent avec P0446 ou indiquent des problemes connexes :
Yes, completely safe. The EVAP system only controls fuel vapour emissions. No effect on engine performance or safety. You'll fail emissions testing though.
A solenoid-controlled valve that allows fresh air into the charcoal canister during purge cycles. When the ECU tests the EVAP system for leaks, it closes the vent valve to seal the system. If it can't close or the circuit fails, P0446 is set.
Rarely. A bad gas cap more commonly triggers P0440 or P0455 (large leak). P0446 specifically points to the vent control circuit, not a general leak. But checking the cap first is free and takes 10 seconds.
The vent valve itself costs 30-120 euros. Labour is 40-150 euros since the valve is usually accessible near the rear of the vehicle. Total: 70-270 euros for most vehicles.
Fixing P0446 costs 60-180 euros total to replace the EVAP vent solenoid. Check the connector for corrosion first, as wiring is the second most common cause.
Clearing a code before inspection resets the readiness monitors, and stations check those. Here are the OBD2 codes that fail, and why a fresh clear fails anyway.
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Branche un adaptateur OBD2 Bluetooth standard, scanne les codes et obtiens un diagnostic par IA avec niveaux de gravite et estimations des couts de reparation.
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