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Message: <blockquote data-quote="americanchadazz" data-source="post: 28063" data-attributes="member: 9470">my 19 equinox has 74,000 miles and the transmission slips when going into 3rd from 2nd and sometimes into 4th. It only really does this when the outside temp is 70° and above and only does it when it goes through the gears the first time. I let the idle come down when first starting before I take off I sometimes sit in my car for 5 or so minutes when leaving work while its running before I take off. I dont just take off fast right when I put it in drive I have about a half mile drive at 15mph.I take the highway daily and when I get off the highway the transmission slips worse shifts weird. I have taken it to a very reputable or so I thought transmission shop 2 times the first time they couldn't recreate it which it was winter and very cold and only did it to me 2 times in a 3 month time period. So I had them do a drain and fill which they did 2 times, they drove it for a few miles and did it again.The second time they found a code in the transmission and I guess the computer needed to be updated so they did that and said it was fixed. It slipped pulling out of their shop. I cant take it up there to really show them because it only does it the most noticeable on first shifting.Does anyone have any idea what could be causing it? I am thinking its the tcm or whatever they call it for this car.</blockquote>