"DEF low, but you know it's not" problem
We added DEF to our 2012 Chevy D/A before our last trip and off we went...Over 500 miles later we got notice that we had 300 miles until we added more...Didn't think that sounded right, but added anot...
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Not a Chevy, but similar on my 2012 F350. Warning came on within 500 miles of new. Took to dealer. He tried adding DEF but it took less than a gallon. He cleared the message and 29,000 miles later and never happened again.
