The Quick Answer above is the generic definition. What follows is the model-specific detail for the Honda models that log P0446.
DTC/P0446·Honda
P0446 on Honda: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Honda
P0446 on a Honda 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.
Typical repair cost, all makes€10 - €450
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Get Skanyx freeWhat does P0446 mean on a Honda?
Honda Civic
2006-2024Honda 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.
What causes P0446 on a Honda?
Beyond the generic causes listed on the main P0446 page, these are the patterns noted for Honda models:
Honda CivicVent valve access requires partial interior or underbody panel removal
Honda CivicSensitive EVAP testing on 1.5T triggers code from minor connector issues
How to diagnose P0446 on a Honda with OBD2
Follow these steps to pinpoint the root cause of P0446:
- Rule out the fuel cap quickly: tighten it and clear the code. A cap more often sets leak codes than P0446, so if the code returns, move on to the vent valve and its circuit
- Locate the EVAP vent valve (usually near the charcoal canister, rear of vehicle or near fuel tank)
- Command the vent valve closed with a diagnostic tool that supports actuator tests (on many cars this needs manufacturer-level software rather than a generic OBD2 reader) and listen for a click. No click means the solenoid has failed or has no power
- Check wiring and connector at the vent valve for corrosion, damage, or rodent chew marks
- Inspect the vent hose from canister to vent valve for kinks, cracks, or blockage
- Check the vent filter (if accessible) for debris or spider web blockage
How much does P0446 cost to fix on a Honda? (EUR)
Estimated repair costs for P0446 in EUR, compiled across makes. Honda parts and labour usually land towards the lower end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0446
These codes are often seen alongside P0446 or point to related issues, on any make:
Looking for the full P0446 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0446 guideSkanyx · Honda
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