P0446 (generic)
EVAP Vent Control Circuit
System: Powertrain · EVAP
Severity: minor · Inspection: often fails
Description
Canister vent valve circuit problem. Common on Toyota — the canister vent solenoid corrodes. Replace the vent valve.
Diagnostic snapshot P0446
- Difficulty
- 6/10 — Intermediate diagnostics
- Est. repair cost
- $120 – $450 (parts + typical shop labor)
Diagnostic workflow
- Confirm P0446 with a live scan — note pending vs stored and freeze frame data.
- Inspect wiring/connectors and related sensors before replacing modules.
- Clear codes and road-test; re-scan after two drive cycles if the monitor must set.
Topics
- OBD-II and scan tools (guide)
- Powertrain DTCs (P-prefix) (system)
Related symptoms
None linked yet.
Common fixes (curated)
None linked yet.
Related articles
- 2019 Toyota Land Cruiser Fuel Tank Hard to Fill, EVAP Vent Issue
- EVAP Vent Valve Stuck Closed Causes: 2020 Toyota Fchv-Adv
- EVAP Vent Valve Stuck Closed 2016 Toyota Camry: Fixes & Symptoms
- Symptoms of an EVAP Vent Valve Stuck Closed 1997 Toyota Previa
- EVAP Vent Valve Stuck Closed Causes 2000 Toyota Land Cruiser
- 2002 Toyota Camry EVAP Canister Vent Solenoid Stuck Open/Closed
- EVAP Vent Solenoid Stuck Closed Fueling Issues (1997 Ford A9513)
- EVAP Vent Valve Stuck Closed 1996 Ford Ltls9000 Diagnosis
- 1997 Ford Contour EVAP Vent Valve Stuck Closed Causes
- Check Engine Light P0446 EVAP Vent Control Circuit 2001 Camry
- DIY Replacement of EVAP Vent Solenoid 1996 Ford Lt8501
- 1999 Toyota Rav4 EVAP Vent Valve Stuck Closed Diagnosis
- EVAP Vent Solenoid Stuck Closed Fueling Issues 1998 Ford F-700
Diagnostic bundle (JSON)
Machine-readable graph: related codes, symptoms, fixes, topics, articles, and curated sources rows. Append &external=1 for optional YouTube / Google CSE hits when API keys are configured (see web/.env.example).