Duramax Diesels Forum Truck of the Week
Old 06-05-2019, 10:39 PM
Dennison digges's Avatar
Dennison digges Dennison digges is offline
Join Date: Jun 2019
Location: Cali :/
Posts: 10


I seem to be having a similar problem my 08 lmm throw code po401 and p1448 along with the clean exhaust filter on the dash. Iíve Manuel Regen with my Cts2 and have gone through about 3 tanks of fuel with out the clean exhaust filter light on the dash turning off. Iíve also started to notice if sitting at a idle for a while I will get a white haze of smoke at witch times Iíll check my injector balance rates and they are high. And once I start driving they will drop a little I am really close to deleting it and going efi live but still scared I wonít be able to find a smog guy anything I can do to try and fix this
08 lmm
Stock for now.
Hoping to delete ASAP
Can I use anyoneís out of state address haha
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