Its a 05 sierra denali with the 6.0
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2005 GMC Sierra Denali Question: where is the purge vent valve and hose located,I need to check it, code 0466.
Answer #1mastertech6371 January 03, 2012, 17:34Master
purge valve on on the front top of the motor.
the vent is back by the tank mounted on the frame.
you need a scan tool, smoke machine and voltmeter to verify if they are working. the code never identifies a bad part, just a failed system.
Replymaster-dlux, January 04, 2012, 14:57Rookie
Thank you .