What does code P0446 mean on a Toyota and is it safe to drive?
P0446: Evaporative Emission System Vent Control Circuit. Here's what it means on your Toyota, what usually causes it, what repairs typically cost, and how safe it is to keep driving.
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What this code means
The PCM has detected a problem with the EVAP vent control circuit, often caused by a stuck or failed vent valve.
Common causes for your Toyota
- Failed EVAP vent solenoid
- Corroded wiring or connector at vent valve
- Blocked vent due to dust, rust, or spider webs
Symptoms
- Check Engine Light
- Possible difficulty filling fuel tank (nozzle keeps clicking off)
Typical fixes
- Replace EVAP vent valve/solenoid
- Clean or clear vent and charcoal canister area
- Repair wiring
Repair cost range
For a Toyota, repairs for P0446 often fall between $150 and $450, depending on the cause and whether you use OEM or aftermarket parts. Labor rates vary by location.
Known issues on Toyota
Toyota P0446 points to the EVAP vent valve (canister close valve/CCV) mounted on or near the charcoal canister. Check the valve with a scan tool command; if it doesn't respond, replace it—it's inexpensive and this resolves P0446 in most cases.
Most commonly affected models
Camry 2002–20064Runner 2003–2009Tacoma 2005–2015