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

Scott,

Ideally, You would remove the block off plate and return the truck to as built status.

Check the RPO for which STYLE of air filter it is supposed to have, See if it matches.

GM has offered both round and square air filters in the past. Login to read more.