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Re: 2004 Yukon Denali EVAP.What Code is This?
Posted to Technical Discussion Forum on 9/2/2007 3 Replies

Hi Bob,

Logic says the purge solenoid is stuck open based on fuel trims. So I would have to say it set a P0455 Large Leak code. I believe this vehicle uses Engine Off Natural Vacuum to check for a small leak and FF/FR say this code set while the engine was r... Login to read more.

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