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2015 Sierra 1500

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About 2015 Sierra 1500

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  1. At carwash washing 2015 Sierra, got back in the truck and the check engine light was on, now it's shifting hard, and when I slow down it downshifts hard, NEVER did this before, just bought it, only had it 3 days!!! 55,000 miles!! What's up?? Anyone have any ideas, must be covered, I'm kinda irritated. Bought it for my wife.
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