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International Automotive Technicians Network
Re: 4T65E won't upshift
Posted to Technical Discussion Forum on 1/18/2018

I agree with Andrew here. If the shift is being commanded, then the issue is hydraulic. A way to check this, is to also look at transmission shift adapts in the TAP cells. You can basically think of them as sort of like fuel trim: the additive ones are the TCM... Login to read more.