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Re: 2009 Chevrolet Duramax LMM trouble code P0101 - has delete
Posted to HD/Fleet Forum on 5/12/2018

This is from PIP4932D Scott

If the ALER reading (with EGR position at 0%) is less than 0.86:1 for a 2007-2010 LMM engine:

Inspect for anything which could result in an unexpected rise in measured airflow. This would include leaks in the boosted side of the... Login to read more.