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My 2023 2500 Rebel does the same thing.
I was on a long drive & had no option but to continue, hitting the OK button every 2 minutes.
The def got down even lower and another warning popper up & I think it stayed on, stating something along the lines of the truck will be limited to 5mph until...
I noticed it once while driving at night only a few days after I got the truck but it hasn’t happened again. Thought I was imagining it until you guys started this thread ! Will keep an eye out for it again.