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Your problem can occur gas or diesel. They both are wrapped by the same exact truck electronically. -
One week old 2026 High Country 3.0 Duramax with 220 miles. Issue started with a failure to "auto start" Sunday morning. Started from within the cab via the push button and all appeared well. Then later in the afternoon and again the "auto start" failure and the push button start in the cab but this time I had two big completely black screens staring back at me. The vehicle is awaiting a GM roadside assistance tow to the dealer for diagnostics. I bought the diesel due to zero faith in the gas engines, but it would appear that does not make one immune to failures. My life long love of GM is failing and I have began to think other brands might be a better option.
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By sigmonster · Posted
My guess is valve body in the transmission went bad. Mine did the same thing, but I was stuck in a mid gear and could go 65 mph at 3800 rpm. My transmission temp got up to 205. Dealer fixed the bad valve body and serviced the transmission in 3 hours--all under warranty. Good luck -
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