What does code P0446 mean on a Pontiac and is it safe to drive?
P0446: Evaporative Emission System Vent Control Circuit. Here's what it means on your Pontiac, 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 Pontiac
- 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 Pontiac, 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 Pontiac
Pontiac P0446 EVAP vent solenoid fault follows the GM pattern—check for corrosion at the canister vent solenoid connector. On Montana minivans with rear HVAC, the canister is in an exposed rear underbody location that sees more road debris and moisture.
Most commonly affected models
G6 2005–2010Torrent 2006–2009Montana 2005–2008