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  1. L5P TSB (service bulletins, recalls, updates)
    So, I've had my 2018 in and out of the dealer for the last 2 months. First, it was DEF Heater 2 failing. Then it was DEF heater 1 failing. After that, it was the NOX sensor. Now, it's throwing another code P20B9 (reductant heater 1 control circuit). Which has been replaced TWICE now. I feel...
  2. Alternative Fuels Diesel Additives Lubricants
    It has come up quite often, especially with the rumors of a DEF shortage now lurking. Figured I would explain this to cover the 30k repetitive questions that have come up First and foremost, regardless of the pretty packaging and nice font that the companies use, GM applications DO NOT work...
  3. Looking For/ Wanting To Buy
    Apparently the jackwagon that owned this truck before me cut the cat off. Does anyone have one laying around? (Doesn't need to be functional BTW, just pass a visual check.)
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