Q: where is the purge vent valve and hose located,I need to check it, code 0466. on 2005 GMC Sierra Denali

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Its a 05 sierra denali with the 6.0
(1) Answer
(1) Comments
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.