Duramax Sixth Generation: 2017-2019 (L5P)
My son has a 2017 L5P with 55K miles that he bought in June on 2017. He has no mods and is completely stock. His check engine light is on and he took it to a local auto parts store and the code was P133B. The guy at the parts store told him that code is for the #4 glow plug but after doing...