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Re: P2175 Sudden downshift to 1st gear 6L-80
Posted to Transmission Forum on 3/9/2021

I second confirm that it was programmed, although, I think they are stuck in second gear and won't shift at all if they aren't programmed. The TCM and solenoids are part of the valve body. I think you can service them separately, but I don't think it is recomm... Login to read more.