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2017 GMC Sierra duramax 2500 Def fluid

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    • February 15, 2024 at 8:40 am #800377
      Tiny Mess
      Participant

      I Have a 2017 denali duramax 2500. A few months ago I received this warning lightthat said in three hundred miles my truck would Drop down to 65 mile in our speed. And then it read that my def fluid was empty. Took it to the dealer and they had it for 3 days and said that it was fixed. And I’ve been 300 miles running. Popped up again telling me the same thing. I had 300 miles before my car went to max speed of 65 miles an hour. has anybody else had this problem?

    • February 15, 2024 at 6:46 pm #800546
      Parts Man1
      Participant

      probably used a non GM def fluid and has contaminate your system. Should never let your def fluid drop below 25%

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