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Re: 2009 Chevrolet Duramax LMM trouble code P0101 - has delete
Posted to HD/Fleet Forum on 5/15/2018

If I remember ALER was in the menu when controlling the egr. a leak on the boost side will give a low ALER. I personally haven't run into leaks at the Y seals. Not to say it can't. Login to read more.