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    DEF range low

    With my 24 Denali I often tow a 3500 lb trailer with a race car. Usually 400 to 600 miles one way. It will always start telling me on the way home that I'm about to run out and go into limp mode. If you stop and add def it might take 2 gallons. If you ignore it and let tell it's go into Limp...

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