Transmission Relearn
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
Unless you have the tools to do it yourself you will probably have to drop it off at the dealer for at least a day , if done correctly the Tech will need to get the trans temp up to 170. This can be done just by brake torquing against the converter for a period of time . Then the TCM is put in relearn mode which makes a bunch of scary noises 😳 as the TCM applies max pressure to each clutch pack
The last part is the drive cycle as the trans adapts were cleared so the trans will need to find out what is the optimal pressure and timing for each shift at each RPM , up and down. Some dealerships leave this to the customer telling them that the trans might shift funky for the next 100 miles as it relearns but there is a very specific drive cycle that needs to be done and it should be done by the dealership and not the customer
Either way, the relearn will make it feel like you are driving a new car.... but because the transmission is a adaptive learning transmisson, unless you occasionally drive it like you stole it you will be doing it again in 20,000 miles
Dave
The last part is the drive cycle as the trans adapts were cleared so the trans will need to find out what is the optimal pressure and timing for each shift at each RPM , up and down. Some dealerships leave this to the customer telling them that the trans might shift funky for the next 100 miles as it relearns but there is a very specific drive cycle that needs to be done and it should be done by the dealership and not the customer
Either way, the relearn will make it feel like you are driving a new car.... but because the transmission is a adaptive learning transmisson, unless you occasionally drive it like you stole it you will be doing it again in 20,000 miles
Dave
Last edited by Dcasole; Aug 14, 2021 at 08:01 AM.
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
Adaptive learning is good in most cases and has been around for a while in a lot of makes , on a normal car you would never know its working as they are all set to produce slush shifts
But after you put a lot of easy miles on a Corvette, like you drive your fathers Buick, every now and then under certain conditions it will hiccup and either do a sloppy
downshift, upshift or bang into gear
The A6 in my C6 would shift flair between 1st and 2nd upshift at just less that wide open throttle. I bought a knock off TECH II and did the relearn myself as this was less than the cost of the dealer doing it plus I had a tool that I could use to diagnose not only my car but all my buddies cars
There is a manual way of reseting the Trans adapts on an A8 but you have to do several acceleration and fast deceleration runs to put the car in relearn mode, you need a really long road with no traffic. (And no cops
)I did it once.... and then immediately bought a knockoff GM MDI device and GDS2 software which is what is needed for 2014 and later GM cars and trucks .
Dave
Last edited by Dcasole; Aug 14, 2021 at 02:48 PM.
Thread Starter
Pro
Joined: Oct 2016
Posts: 656
Likes: 247
From: Florida
Hey - thanks Dave. I am getting a shift flair from 1-2 sometimes. Any chance you could post the manual way of resetting the Trans adapts on an A8? And yes; I have a really long road w/no traffic not too far away.
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
Dave
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Le Mans Master
Joined: Oct 2014
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From: Atlanta GA
Melting Slicks
Joined: Feb 2018
Posts: 2,188
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From: North Texas
Dave where did you purchase your GDS2 and MDI? Any special version I need to look for? I'.m running a 17 A8. Have they gotten better at installing them on your computer? A lot more questions but this is a good start.
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
VXDIAG VCX Nano Diagnostic Programming System Compatible for GM/Opel
It works absolutely great and I have programed modules etc, with GDS2 you can do anything that a dealer can do but the software is a pain in the As##$ to setup , I have helped people and it loaded instantly and then there were cases that I just could not get it to load ( and I am in IT )
It was designed to run on old 32 bit machines, I have it loaded on an older Icore 5 machine running 32 bit windows 10 4 gig of ram and an SSD , an older Levino ICore 5 8 gig with windows 10 64 bit with an SSD . but can't get it to run on a new Dell Icore7
When helping folks I ask them to just save a lot of headaches and try to find a refurbished clone of one of my machines I bought both of my old heavy laptops for less that $200 refurbished , they are not the coolest laptops but they both are built like bricks so I don't have to worry about breaking them 😉
Dave
Le Mans Master
Joined: Oct 2014
Posts: 8,673
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From: Atlanta GA
In desperation I had a old Dell core duo machine layng around so I tried to load it on that machine . I was surprised as hell when it ran but it was real slow loading and performing tasks do so I took a gamble and bought the same machine that was refurbished but it had an old i core 5 and 4 gig of ram off of amazon , it works great , so good that I upgraded the ram to 8 gig and now it runs even better
My daughter had an old ICore 5 Levino that she had when in college , I loaded it on that alo with no problems at all
If you buy one email me thru these forums if u need help
Dave
Safety Car
Joined: Jan 2014
Posts: 4,496
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From: Walhalla South Carolina
Relearn
My 17 GS has a harsh 1 to 2 shift especially when cold. So can I do the relearn proc. Outlined In the attached document by driving it or do I have to take it to dealer to be connected to a computer device? Driving car like you stole it is mentioned as well, so can I just drive the car hard and will that satisfy the relearn. Thanks
Le Mans Master
Joined: Oct 2014
Posts: 8,673
Likes: 2,728
From: Atlanta GA
My 17 GS has a harsh 1 to 2 shift especially when cold. So can I do the relearn proc. Outlined In the attached document by driving it or do I have to take it to dealer to be connected to a computer device? Driving car like you stole it is mentioned as well, so can I just drive the car hard and will that satisfy the relearn. Thanks