What does code P0446 mean on a Acura and is it safe to drive?
P0446: Evaporative Emission System Vent Control Circuit. Here's what it means on your Acura, 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 Acura
- 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 Acura, 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 Acura
Acura P0446 EVAP vent valve fault follows Honda's canister vent valve diagnosis. Test the vent valve electrically before replacing. On MDX and Pilot, the vent valve is accessible from under the rear of the vehicle near the spare tire.
Most commonly affected models
TL 2004–2008MDX 2003–2006RDX 2007–2012