Silverado 1500 2WD V8-4.8L VIN V (2006)
Evaporative Canister Filter: Customer Interest
Emissions - MIL ON/DTC P0446 Stored In ECM
TECHNICAL
Bulletin No.: 02-06-04-037I
Date: September 16, 2010
Subject: Check Engine Light On, Fuel Tank Hard to Fill, DTCs P0442, P0446, P0455 or P0449 Set (Replace Evaporative Emission (EVAP) Vent
Valve Solenoid Assembly and Add/Relocate Filter Box Using Service Kit)
Models:
1999-2007 Chevrolet Silverado (Classic) Models
1999-2007 GMC Sierra (Classic) Models
2007-2010 Chevrolet Silverado Models (Including Hybrid)
2007-2010 GMC Sierra Models (Including Hybrid)
Supercede:
This bulletin is being revised to add the 2010 model year and to include the Hybrid models. Please discard Corporate Bulletin Number 02-06-04-037H
(Section 06 - Engine/Propulsion System).
Condition
Some customers may comment about the check engine light being illuminated. They may also comment that their vehicle is difficult to fill with fuel or
when filling, the pump continuously shuts off before the tank is full.
When checking the vehicle for DTCs, the ECM may report one or more of the following DTCs set as current or in history: P0442, P0446, P0449 or
P0455.
Cause
The EVAP canister vent solenoid (CVS) valve draws fresh air into the system through a vent.
Under certain operating conditions, dirt and dust intrusion into the EVAP CVS fresh air intake/venting system, may result in restricted air flow.
Under certain operating conditions, water, if ingested into the EVAP CVS fresh air intake/venting system, may reach the CVS valve causing corrosion in
the CVS valve, and may cause restrictions in the fresh air intake path, when the valve is in the closed position.
Correction (1999-2007 Classic/Old Style Models)
After following the published SI diagnostics and determining that the EVAP canister vent valve is the cause of the MIL light, replace the existing EVAP
canister vent valve assembly with a new assembly. This new assembly is a sealed unit that is designed to be vented through a remote filter box. To ensure
correct installation, follow the procedures below.
Important
DO NOT replace the EVAP canister assembly for this concern unless it fails the leak test.
1999-2003 Model Year (Use Service Kit P/N 19207762)
1. Raise the vehicle. Suitably support the vehicle.
2. Disconnect the EVAP canister vent valve electrical connector, if equipped.
3. Disengage the two vent valve pipe clips securing the pipe to the underbody. Remove the clips from the underbody and discard.
4. Disconnect the vent valve pipe at the EVAP canister.
5. Remove and retain the EVAP canister vent valve bracket mounting bolt.
6. Remove the complete EVAP canister vent valve assembly with bracket attached and discard.
