2011 Chevrolet P0446: What It Means & Is It Safe to Drive?
P0446 on the 2011 Chevrolet: Evaporative Emission System Vent Control Circuit. Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe 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 on the 2011 Chevrolet
- 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 2011 Chevrolet, repairs for P0446 typically fall between $150 and $450, depending on the root cause and labor rates in your area.
Known issues on Chevrolet
GM P0446 indicates a vent solenoid fault on the EVAP canister. Check for corrosion at the connector first—trucks in salt belt states frequently corrode the vent solenoid wiring. Clean the connector before replacing the solenoid.
Most commonly affected models
Silverado 1999–2007Tahoe 2000–2006TrailBlazer 2002–2009