# P0446 — EVAP Vent Control Circuit

> ClearTheCode diagnostic code reference (not OEM service data).

Source: https://clearthecode.com/codes/P0446

**System:** Powertrain · EVAP

**Severity:** minor

## Description

Canister vent valve circuit problem. Common on Toyota — the canister vent solenoid corrodes. Replace the vent valve.

## Diagnostic snapshot

- **Difficulty:** 6/10 — Intermediate diagnostics
- **Est. repair cost:** $120 – $450

## Diagnostic workflow

1. Confirm P0446 with a live scan — note pending vs stored and freeze frame data.
2. Inspect wiring/connectors and related sensors before replacing modules.
3. Clear codes and road-test; re-scan after two drive cycles if the monitor must set.

## Related articles

- [2019 Toyota Land Cruiser Fuel Tank Hard to Fill, EVAP Vent Issue](https://clearthecode.com/articles/fuel-tank-hard-to-fill-toyota-land-cruiser-2019)
- [EVAP Vent Valve Stuck Closed Causes: 2020 Toyota Fchv-Adv](https://clearthecode.com/articles/evap-vent-valve-stuck-closed-3814-toyota-fchv-adv-2020)
- [EVAP Vent Valve Stuck Closed 2016 Toyota Camry: Fixes & Symptoms](https://clearthecode.com/articles/evap-vent-valve-stuck-closed-5528-toyota-camry-2016)
- [Symptoms of an EVAP Vent Valve Stuck Closed 1997 Toyota Previa](https://clearthecode.com/articles/evap-vent-valve-stuck-closed-symptoms-toyota-previa-1997)
- [EVAP Vent Valve Stuck Closed Causes 2000 Toyota Land Cruiser](https://clearthecode.com/articles/evap-vent-valve-stuck-closed-3814-toyota-land-cruiser-2000)
- [2002 Toyota Camry EVAP Canister Vent Solenoid Stuck Open/Closed](https://clearthecode.com/articles/evap-canister-vent-solenoid-stuck-toyota-camry-2002)
- [EVAP Vent Solenoid Stuck Closed Fueling Issues (1997 Ford A9513)](https://clearthecode.com/articles/vent-solenoid-stuck-closed-fueling-issues-ford-a9513-1997)
- [EVAP Vent Valve Stuck Closed 1996 Ford Ltls9000 Diagnosis](https://clearthecode.com/articles/evap-vent-valve-stuck-closed-ford-ltls9000-1996)
- [1997 Ford Contour EVAP Vent Valve Stuck Closed Causes](https://clearthecode.com/articles/evap-vent-valve-stuck-closed-3814-ford-contour-1997)
- [Check Engine Light P0446 EVAP Vent Control Circuit 2001 Camry](https://clearthecode.com/articles/check-engine-light-p0446-vent-control-circuit-toyota-camry-2001)
- [DIY Replacement of EVAP Vent Solenoid 1996 Ford Lt8501](https://clearthecode.com/articles/evap-vent-solenoid-replacement-diy-ford-lt8501-1996)
- [1999 Toyota Rav4 EVAP Vent Valve Stuck Closed Diagnosis](https://clearthecode.com/articles/evap-vent-valve-stuck-closed-toyota-rav4-1999)
- [EVAP Vent Solenoid Stuck Closed Fueling Issues 1998 Ford F-700](https://clearthecode.com/articles/vent-solenoid-stuck-closed-fueling-issues-ford-f-700-1998)