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  1. Duramax Fifth Generation: 2011-2016 (LML)
    I have a 2014 LML 2500HD. On July 5th towing our 5th wheel back from Hershey I got a poor quality DEF reading. Since that time I have spent $2500 on parts and labor. Finally I get a call saying I need a diesel particulate filter. I agreed to go ahead with the service and was told that the part...
  2. Duramax Sixth Generation: 2017-2019 (L5P)
    My truck is a 2018 GMC Sierra 2500 6.6 turbo-diesel with an Allison transmission. I believe that makes it an L5P. It has 104K miles on it. Received warning light that I needed to add DEF or my speed would be limited to 65 MPH. The next chance I had, I bought some DEF and tried to add it...
  3. Duramax Fifth Generation: 2011-2016 (LML)
    I am new to this forum and am hoping someone on here will be able to point me in the right direction. I have read a hundred threads on this issue without finding one that is the same as what I have going on. So I figured it's time to post. My 2015 LML (159k) had a code for the Bank 2 NOX sensor...
  4. 3.0L Duramax
    Hi to all. Recently purchased a 2021 Silverado with the 3.0 liter Duramax. We are a light duty user. Seldom carry more than luggage. We live in Northern Indiana. We do a lot of traveling. We are getting ready take a trip out west. Lots of time in Montana. Travel out will be Interstate and 80...
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