Just give me the bad news.
My Dad passed away in February 2021. Before we could get his affairs in order Mom got sick and that took priority until she passed last September. Dad's truck, a 2015 Silverado 2500HD with just shy...
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I'd try disconnecting the battery(s) for 10 minutes or so, then connect battery back up and start the car. See if that fixes it the display and error codes etc.
