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P0446 — EVAP Vent Control Circuit

Electrical or mechanical fault in EVAP vent valve circuit.

Severity: LowRepair: $50-$300Difficulty: Easy

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Common symptoms of P0446

Common causes of P0446

Repair cost & difficulty

Typical cost to fix P0446: $50-$300 · Difficulty: Easy

Pro tip: On GM trucks, check for spider webs in the vent hose — insects love nesting in there.

Vehicles commonly affected

All makes — common on Toyota, GM

Related trouble codes

P0440P0441

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ScanFixAI is a diagnostic aid, not a substitute for professional repair. Cost estimates are typical ranges and vary by vehicle and region.