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.
DTC/P0446·Volkswagen
P0446 on Volkswagen: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Volkswagen
P0446 on a Volkswagen 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.
Repair cost on Volkswagen€12 - €518
What does P0446 mean on a Volkswagen?
Volkswagen Golf
2005-2024VW 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).
What causes P0446 on a Volkswagen?
Beyond the generic causes listed on the main P0446 page, these are the Volkswagen-specific patterns we see most often:
Volkswagen GolfVent valve failure near charcoal canister (rear bumper area)
Volkswagen GolfTight canister mounting location increases labour time on some model years
How to diagnose P0446 on a Volkswagen with OBD2
Follow these steps to pinpoint the root cause of P0446:
- Check gas cap for proper seal. Tighten and clear the code. If it returns, the cap is not the issue
- Locate the EVAP vent valve (usually near the charcoal canister, rear of vehicle or near fuel tank)
- Test vent valve with a scan tool: command it closed 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 Volkswagen? (EUR)
Estimated repair costs on a Volkswagen (Volkswagen parts and labour typically run 15% above the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0446 on Volkswagen
These codes commonly cluster with P0446 on Volkswagen vehicles:
FAQ: P0446 on Volkswagen
Can I drive with P0446?
Yes, completely safe. The EVAP system only controls fuel vapour emissions. No effect on engine performance or safety. You'll fail emissions testing though.
What is the EVAP vent valve?
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.
Can a bad gas cap cause P0446?
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.
How much does it cost to fix P0446?
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.
Looking for the full P0446 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0446 guideSkanyx · Volkswagen
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