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2018 Terrain Denali 2.0T FWD
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Hello did you get this figured out ? I forgot to put mine in park and shut it off now it shows code P187E transmission valve stuck off
It looks like the OP is a one-and-done. They asked a question, but hasn't logged back in since the posting to look for any answers. So, unless anyone chimes in with a solution, I doubt that you'll be hearing about one from the OP.
 

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Well I had to take it to a dealer and ended up costing me 2500$ it ended up being so type of valve body inside the transmission. I guess it has some type of magnets that crack. It is a really stupid design to be honest
 
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