2018 Nissan P0446: What It Means & Is It Safe to Drive?
P0446 on the 2018 Nissan: 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 2018 Nissan
- 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 2018 Nissan, repairs for P0446 typically fall between $150 and $450, depending on the root cause and labor rates in your area.
Known issues on Nissan
Nissan P0446 canister vent valves on trucks and SUVs are exposed to road splash and can fail from moisture intrusion. Test the valve electrically before replacing—sometimes cleaning the connector resolves the fault.
Most commonly affected models
Altima 2002–2006Pathfinder 2001–2004Xterra 2000–2004