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TCM calibration update, service fast learn.
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Question
Crobinson16
I just got my 2018 Silverado LTZ 6.2 with the 8l90 8spd back from the dealer where I had a TCM calibration update done, it was for improved shifting. They called and told me it was ready for pickup. I read over the work order and noticed that there was nothing listed that said performed service fast learn after installing update. So I asked the service manager and he said he would ask the tech if he did it or not. Service manager said it was not done. They said I can bring it back in to have it done if I wanted no problem.
I have read over many service bultions pertaining to the transmissions, and they all state that when a TCM calibration update is done that the service fast learn is to be done as well to reset the parameters and shift adaptation. I've been driving it around for a few days and it feels as though the truck shifts better the more I drive it. When I first drove it home it felt like the tq converter was locked all the time and it didn't want to down shift till the peddle was wide open. The motor would kinda bog for awhile or stay in a higher gear longer before it would shift.
My question is should I still go back and have the service fast learn procedure done. My truck only had 1, 800 miles. If I keep driving it without having the fast learn done, will it eventually learn it's self where it needs to be or should I just take it in and let them do it. Also what exactly is the service fast learn actually doing. If I take it back I wanted to take it in and wait on it so it doesn't sit over night and cool down, as I believe the service fast learn is done in the service stall and has to be at a certain trans temp . I didn't want them brake stalling the trans to get it up to the required temp. The service fast learn is different from the individual clutch learning process. Thanks in advance.
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