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I have had two fail on Cornerstones, on a 19 the other a 21 both with less then 2,000 miles. There are many Cornerstones with failed DEF heads. Several posts on this page under the different DEF posts.
Chuck in SW FL
Digital 2021 Cornerstone "B"
A "Digital" 2019 Cornerstone "B" Traded
A "Classic" 2014 Anthem 42 RBQ---Sold