Have you replace the FTP (fuel tank pressure sensor) ? If the light still show about this code use this TSB. This would apply to you if you experience hard to fill fuel tank , who can fix it in Arizona, most of all the auto repair shop. If not you can take it to the Dealer,
Bulletin No.: 02-06-04-037J
Date: March 20, 2012
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 update the Parts Information. Please discard Corporate Bulletin Number 02-06-04-037I (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.
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