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·Toyota
P0446 on Toyota: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Toyota
P0446 on a Toyota 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 Toyota€10 - €450
What does P0446 mean on a Toyota?
Toyota Camry
2007-2024Toyota 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.
What causes P0446 on a Toyota?
Beyond the generic causes listed on the main P0446 page, these are the Toyota-specific patterns we see most often:
Toyota CamryVent valve connector corrosion in humid climates
Toyota CamryStandard solenoid wear at 120,000+ km
How to diagnose P0446 on a Toyota 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 Toyota? (EUR)
Estimated repair costs on a Toyota (Toyota costs align with the average for this code across makes).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0446 on Toyota
These codes commonly cluster with P0446 on Toyota vehicles:
FAQ: P0446 on Toyota
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 · Toyota
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