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  1. Colorado Diesel Mechanical
    Just purchased 2016 2.8 Duramax Z71 with 133,000 miles. First trip out of town yesterday, no load or trailer. Halfway up a steep grade, "reduced power" warning displayed along with check engine light. I pulled over within a mile & shut off truck for 5 minutes. Warning disappeared but check...
  2. Colorado Diesel General Discussions
    Hello, I have a 2018 with 38000 miles. 2000 miles ago, my check engine light came on while I was on a trip. I noticed that not only did I have the check engine light, but my exhaust brake and my downhill speed control did not work ( I had my trailer with me). I dropped my trailer off and was...
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