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  1. Colorado Diesel General Discussions
    I am about to purchase a 2016 Z71 Duramax 4x4. This is a 1 owner truck in showroom condition, 134K on the odometer. I have never driven a diesel Colorado before but getting on the freeway it felt more like a 4 cylinder gas motor. There is no noticeable hesitation & tranny shifts smooth, 2...
  2. Colorado Diesel General Discussions
    Hello, I am looking to see if anyone else has had this problem or know what is going on -- I have a 2018 with 38000 miles on it. 2000 miles ago and about 30ish days, my check engine light came on while I was on a trip with my trailer. I also noticed neither my exhaust brake or downhill speed...
  3. 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...
  4. Colorado Diesel Mechanical
    I have had two Reduced power / Check engine episodes so far on this new truck. Both times were pulling 3000# travel trailer, in tow mode, on 6% grade, in cruse control at about 65 miles per hour. Limped into dealer. Three days of diagnostic only to say "Soft failure" I believe it is an issue...
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