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  1. Duramax Sixth Generation: 2017-2019 (L5P)
    New here long time lurker haha but recently my 2018 L5p been throwing P249D. Had read it could be the Def injector so I ran to dealer and bought one, put it in cleared code and did a forced Regen with my cts III. The code still comes up every single key cycle. It is not limiting my speed or...
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