Some 1999-2008 full-size pickups may be operated in dusty or muddy environments, such as farming, mining or off-road type applications. An owner may comment about the illumination of the SES light, with a DTC P0446 (Restricted/Blocked EVAP Vent Path) being set.
If bulletin 02-06-04-037B (Classic only) was completed for the Silverado/Sierra Classic, and on the new style Silverado/Sierra pickups, the vent solenoid prefilter intake is located at the rear of the transmission. Even in this location, the prefilter may become plugged with dust or mud.
If the prefilter intake is plugged with dust or mud, relocate the prefilter forward an additional 8 5/8 inches (220 mm) from its present location (fig. 17).
A Present location
B New forward location
- Thanks to Jim Will
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