2024 GMC P0446: What It Means & Is It Safe to Drive?
P0446 on the 2024 GMC: 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 2024 GMC
- 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 2024 GMC, repairs for P0446 typically fall between $150 and $450, depending on the root cause and labor rates in your area.
Known issues on GMC
GMC P0446 vent solenoid fault follows the same pattern as Chevrolet trucks. On Sierra and Yukon, corrosion at the vent solenoid connector from road salt and underbody moisture is a common cause—clean or replace the connector before condemning the solenoid.
Most commonly affected models
Sierra 1999–2007Yukon 2000–2006Acadia 2007–2016