DT Codes . com
DTC - Diagnostic Trouble Codes information

P0446

Powertrain Codes

P0446 - CHEVROLET - Restricted/Blocked EVAP Vent Path

Symptoms

- Engine Light ON (or Service Engine Soon Warning Light) - Possible a noticeable fuel odor caused by the release of fuel vapors

Possible Causes

Dirt and dust intrusion into the EVAP canister vent hose assembly, resulting in restricted air flow, may cause this condition.

When Detected

The PCM has determined that a malfunction exists in the electrical circuit for the vent valve/solenoid in the evaporative emission control system.

Tech Notes

There is a bulletin for the following models: 1999-2007 Chevrolet Silverado (Classic) Models 2007-2008 Chevrolet Silverado Models P0446 Chevrolet Service Bulletin

Description

The PCM monitors the EVAP Vent Valve/Solenoid system wiring for opens or shorts.