TrailBlazer 2WD L6-4.2L VIN S (2003)
Fuel Filler Neck: All Technical Service Bulletins
Emissions - DTC P0440/P0455/P0442 (EVAP) Diagnostics
Bulletin No.: 05-06-04-014A
Date: March 21, 2005
INFORMATION
Subject:
Diagnostic Aids for Diagnostic Trouble Codes P0440, P0455 and/or P0442 - Evaporative Emission (EVAP) System Leak
Models:
2004 Buick Rainier
2002-2004 Chevrolet TrailBlazer Models
2002-2004 GMC Envoy Models
2002-2004 Oldsmobile Bravada
with 83 Liter (22 Gallon) or 96 Liter (25 Gallon) Fuel Tanks
Supercede:
This bulletin is being revised to remove the 2005 model year. Please discard Corporate Bulletin Number 05-06-04-014 (Section 06 - Engine/Propulsion
System).
This bulletin is being published to aid technicians in the diagnosis of DTCs P0440, P0455 and/or P0442.
It is possible that a fracture as small as 0.508 mm (0.020 in) may be found in the fuel tank filler neck, causing a DTC P0440, P0455 and/or P0442 to set.
Due to the location above the liquid fuel level, this small fracture will not cause a visible fluid leak.
The technician should pay particular attention to the fuel tank filler neck area while performing the smoke test outlined in SI. Refer to the appropriate
diagnostic information for P0440, P0455 and/or P0442 in SI.
When performing the smoke test outlined in SI, it may be necessary for the technician to manipulate the fuel tank filler neck in order to see smoke
escaping from this minute fracture.
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