Performing a fast learn on an 8L90 / 6L80 GM truck to fix shifting problems using the Autel MS906.

[@christophermatthews2238]

Hello Sir, I am so grateful that you made this video. I purchased the scan tool and completed my fast learn procedure about 30 minutes ago. It worked just as you said it would, and now my 2015 Yukon Denali shifts like a dream. Thank you so much and may God bless you for your generosity. I almost traded the car last week, but glad i didn't. Much love Sir!!!!!!

[@jaybilawchuk2225]

This video is my exact issues!!! 17 Sierra with the 6.2 and an 8speed. Thank you!!!!! I don’t know where to start looking for this learn but at least I know it’s a common thing. Cheers from central Canada!!

[@TimHancock-h6e]

When I did my'n on my 3.0 Duramax, it was kinda violent. Shook the truck and heard a bunch of clunks and bangs. But it did straighten up shift problems from 10-8 and 9-10

[@737mechanic]

Yea, it was a little concerning but I guess that is normal.

[@kalani1987]

I changed the techm seals in my 6l80 and it improved the shifts but still hits hard from P to R or D. Did a relearn at the dealership and it seemed to resolve the problem

[@COFFEE-e3p]

SO MUCH FOR COMPUTERS MAKING LIFE EASIER, IT SURE IS MAKING THE SHOPS AND THE DEALERS RICHER $$$$$

[@rabgeorgia6560]

No it's not

[@mattress2331]

I have heard that Cleaning the Mass Air Flow helps too!

[@737mechanic]

That would only help if the shudder was engine-related.

[@bagger2013jm]

Great video. Thank you

[@John___Dough]

What happens to me is in traffic only it shifts hard in 1 and 2 up and down usually when the trans temp is 194 in heavy traffic just did fluid and filter change gonna check it out thx 😊

[@ma93256]

I did this learn procedure and I noticed a huge difference but after about a week it came back, it’s as if the ecm changes it back on its own after some time. Is there a way to enable this permanently? Have you had this happen?

[@JEE7600]

I have the 6 Speed MYC - 2017 Chevrolet Silverado. When I click on TCM there is only Transmission Pressure Line Reset not the transmission fast relearn?? So what would be the process?

[@737mechanic]

What scan tool do you have?

[@Griswald1968]

@737mechanic are you in Austin? I just swapped in a Precision Industries Vigilante converter after 2nd GM converter took a dump at 100k

[@737mechanic]

I am in Dallas.

[@thump16]

I was told you have to drive the truck atleast 250 miles for a full relearn after trans program. I had a new torque converter installed yesterday and when I left the dealership the mechanic failed to take it on a test drive so as soon as it shifted into second it grabbed the wheels and drug so the service manager came out and we took it for a drive and he stated that there had to be at least 250 miles driven on the vehicle to clear up any issues whenever there is a transmission adjustment or repair

[@737mechanic]

They are correct for it to learn the ideal shifting patterns for your driving style but there shouldn't be any very hard or really abnormal shifts.

[@1320str8liner]

How you you know which telematics communication module to select? You selected the number 10. Mine gives me 3 options 10, 9.6, 9.7 how can you be sure which is the right one to select?

[@737mechanic]

I made a video showing how to figure it out. kzbin.info/www/bejne/hYPJqJqKq7CJq5o

[@delirium5119]

It seems the shuddering occurs more when bouncing back and forth between v4 and v8 mode.

[@737mechanic]

I read some people had that experience. Before I deactivated my AFM/DOD I tried to see if that was the case with mine and I never felt a difference between the two.

[@johnelder1938]

I am very curious how this has held up, in the time since this video was made. GM Service Advisors say they stopped doing these "re-learns" because the hard shifting/clunking came back within 48-hours, but I have seen some feedback from owners that say these relearns have helped substantially. Months later, is the hard shifting/clunking/feeling like you've been rear ended still occuring? Did it come back, or require ANOTHER re-learn? I would love to know how it's working for you now (February 2022). :)

[@plumber3602]

0

[@IntelligentElephant]

I reset mine and yeah a few days to a week the reset is gone. I have a scan tool that can reset. After reset the truck drives really great, then a week later the shifts are lousy again.

[@leeezell6064]

I'd love to know how this has held up, too! Please give us an update @737mechanic I just had my transmission valve body replaced today at the dealer as an attempt to fix this lousy transmission. They also replaced the internal wiring harness with a newer model and fresh fluid. I'm hoping they did the fast learn but I'm not sure as it doesn't mention it on the receipt.

[@darianthompson5975]

Have you done the update to lower the transmission temperature?

[@737mechanic]

What update? My trans temp has always been good.

[@darianthompson5975]

@@737mechanic the new thermal bypass valve moves it from 190 to 150-160 for better health of the fluid and transmission. I would be interested to see your take on that.

[@darianthompson5975]

@@737mechanic 21-NA-199 recall

[@737mechanic]

@@darianthompson5975 Thats a service bulletin. Interesting I will look into that.

[@sammymaciel3876]

I have a p0722 trans output shaft speed sensor no signal on a 2019 gmc savana with 8l90 trans. To replace the speed sensor harness i have to remove the valve body to get acsess to remove and replace. Hoping i dont have to do a fast learn after the repair due to me not having a scan tool of that caliber lol

[@MarkVarelaZ]

Do you hear whistling under your truck when accelerating?

[@737mechanic]

I have never noticed any.

[@cup_and_cone]

Still holding up? GM service centers are apparently no longer doing Service Fast Learn Procedures because they say the truck just goes back to its old habits within a few days of driving. I'm thinking of getting the Sonnax shift improvement kit for the valve body...

[@737mechanic]

It still on occasion has a harsher than normal shift. It is few and far between, so I am not to worried about it. My because concern was the shudder that the fluid change took care of.

[@daniellong958]

I have a fully updated Autel MS906BT and the only function I have available under Transmission Control Module is "Transmission adaptive pressure reset". Did they possibly remove the relearn feature?

[@FrostyBudz420]

I'm having same issue right now I got the exact tool he had MS906 TS and it missing the transmission fast learn function just like yours, and it's supposed have this feature for my 2016 silverado with 6l80e and the only special function that's showing for the TCM is transmission adaptive pressure reset and that's it nothing else.. I reached out to tech support, and they remotely diagnosed it, and even they're puzzled. They said it supposed to have the function and now have their engineers looking into it... Have you found any solutions to getting this special function back?

[@JEE7600]

@@FrostyBudz420 I believe we have the same issue. IF you have the 6 Speed it doesn't show this option for some reason.

[@AsTheWheelsTurn]

This is a long shot hoping someone will chime in with some advice. I just had my transmission rebuild on a 2015 gmc Sierra 5.3. - I feel like the mechanic has done something incorrect. he has had it for a month now. has retired it to me a few times and the truck is not shifting correct. once up to full operating temp it will slip badly going into 2nd. Instead of shifting it will go into neutral and the revs will go up fast until I let off the gas , then it will usually clunk into gear , it goes through all the other gears fairly normally. he is claiming that the truck has to go thru a "learn cycle" than can take multiple days of driving it with these symptoms. sometimes it will just stick in second until oi come to a complete stop then it will go back to normal for a little while. it is also leaking a considerable amount of fluid, took it back twice for just the fluid leak and he keeps saying its fixed but then I take it home and its leaking. he said "sometimes it will leak a little at first"....none of this seems correct. the truck only has 80,000 miles on it and I do not think it even needed a transmission , the whining noise it was making that brought me in the begin with has not been resolved with the rebuild. this shop is where my warranty required me to take it and has very good reviews so I felt like it was a reputable shop. Is it true that a 2015 gmc transmission requires a re-learn period like this and do these sound like normal symptoms of that? I paid a lot of money for this truck and feel like this guy may have destroyed it. the amount of time it is taking is also excessive seeming to me. there is no check engine light coming on so he says it is fine and it will just take a little while to sort itself out.

[@737mechanic]

The adaptive relearn should only take no more than a few days if driven normally every day. He is stalling hoping that you either get used to it or give up.

[@AsTheWheelsTurn]

@@737mechanic I picked it up again today for maybe the 4th time, still the same thing but this time I almost caused an accident on the freeway because it downshifted hard and stuck in whatever gear it was when it should have just gone into a normal overdrive, had to pull off the freeway and limp it home.there is no getting used to that!! it is literally undrivable. first thing he asked was if it gave me a light/code...so I think he genuinely can not figure out what is happening and was hoping id drive it enough to throw a code , it is so bad I can not safely drive it. I dont know what to do other than take it somewhere else and spend thousands of dollars then try to somehow get him to pay me back for the loss.so as of tomorrow I will be taking it back again and beginning month #2 I feel like even if he is struggling with idiot he spent the proper time figuring it out it would be done but it seems like they have way too much work and just letting my truck sit for days at a time then working on it maybe for one hour every few days. Not a good experience.

[@AsTheWheelsTurn]

@@737mechanic oh and thank you for your response. I am glad to know I am not crazy here to be questioning this.I have been super chill and patient thru the while thing until today I flipped out on him a little. it has just been too long and keeps giving it back all fucked up.

[@garettstahl]

@@AsTheWheelsTurn Im having the same issues with my 2015 Silverado you described. Has anyone figured out how to fix yours yet? Id love to know what it took to fix it as I have to do my repair myself. I cant afford a shop. Thanks

[@tomw21]

@@garettstahl Describe your symptoms

[@cohuynh1555]

thank you , what kind the scan you used , ? my truck and your truck exactly model and years and exactly problems like you just said .i did exactly you did the first part , except , i add 1 more quart blue lable after one week and run the temp 149 and drain back out ,run couple days now took care the shudder ,but one a while i can fell the blunk in the low gears when i get ready to stop , but only sometime , anyway thank you so much ,i will try do the tran fast learn soon ,

[@737mechanic]

My scan tool is an MS906TS but this one is the same without the TPMS feature, it will do a fast learn and everything mine does. amzn.to/3lMzw6u

[@DTR0454]

Bypass that trans thermostat too.

[@jacobricard9989]

Mine does it every single time I stop they relearned it and nothing changed

[@randywoodall7555]

Will all of the scan tools (Autel & Xtool) that you've included in your list of Amazon links work for the GM Service Fast Learn Adapts procedure? I've been trying to look up features on them and they seem to be sort of vague on what they can/can't do in relation to TCM functions. I'm looking to get the Re-Learn procedure done after replacing my 2012 6L80 with an reman'd one but didn't want to spend another $700-$1000 just to do it, so if there are less expensive options for a DYI'er that work, any recommendations would be appreciated. I've already got the reflashing requirement figured out ....

[@737mechanic]

The D7, D8, and autel should do it.

[@tomw21]

Have you done this on 6l80e Chevrolet Silverado 1500 2015 and up. I don't think you are able to do it on 6l80e.

[@737mechanic]

Yes the 6L80E also does this.

[@tomw21]

​@@737mechanic won't do it on 6l80e 2015 Silverado 1500. Looks like will only do it on 8speed transmissions.

[@cohuynh1555]

fast learn on GM only dealership can do it or the other mechanic shop can do it too ???? .

[@737mechanic]

You have to have a machine that will allow you to do it.

[@delirium5119]

Having shift shudder on a 2015, 4x4, 5.3, 6 speed with 140k miles. Are these issues common or are these fixes for just an 8 speed?

[@737mechanic]

I have read that people with the 6 speed have fixed their shudder by changing the fluid but I think the 6 speed takes the regular dexron VI.

[@gregadkins7883]

Can this be done if you replace the valve body with a new one? I replaced mine on a 2015 Yukon Denali and now it won't start.

[@737mechanic]

That should not prevent it from starting. When replacing the valve body you need to do the adaption program.

[@bhhhhedge]

i have a chevy 2012 1500 (6l80 trans) and an autel ms909 but i dont see the fast learn procedure, am I missing something?

[@737mechanic]

Have you looked under special functions?

[@bhhhhedge]

@@737mechanic sorry just saw this (just replaced TCM) under TCM , special functions i had Reset transmission life and reset transmission adaptations

[@737mechanic]

@@bhhhhedge Some transmissions do not have fast learn.

[@westhomp1721]

@@bhhhhedgeI have a 2010 silverado with the same transmission. What did u end up doing about the fast learn adapts?

[@nyrican0015]

I tried 4 scanners and none of them have the transmission learn function and the Amazon description says it has transmission relearn and they don’t, I called a couple local shops they say 200 dollars with the license to access the function

[@737mechanic]

What make and model vehicle? All three of my scanners have the trans relearn function. But you also need to realize not all vehicles support that function.

[@remynyc23]

@@737mechanic I have a 6l90 will the scanner work ?

[@737mechanic]

@@remynyc23 As long as GM has that option for the 6L90 then any scanner like the Autel MS906 will be able to do a relearn.

[@FrostyBudz420]

I'm having same issue right now I got the exact tool he had MS906 TS and it missing the transmission fast learn function just like yours, and it's supposed have this feature for my 2016 silverado with 6l80e and the only special function that's showing for the TCM is transmission adaptive pressure reset and that's it nothing else.. I reached out to tech support, and they remotely diagnosed it, and even they're puzzled. They said it supposed to have the function and now have their engineers looking into it... Have you found any solutions to getting this special function back?

[@wildhawgs2875]

Hello sir. Did the trans fluid flush with blue label Mobil 1 yesterday at 50k miles. I bought the 2019 Silverado 5.3L with the 8 speed transmission a month ago and after some research decided to do the flush. I had no shudder or harsh shifting. Now, unfortunately, after the flush, I'm getting a hard downshift from 2 to 1 when coming to a rapid stop. When that happens it also jumps from 1 to 2 upon acceleration. If it comes to a gradual stop it doesn't shift hard. Seems all other gears are shifting smoothly. How's your truck shifting today after this relearn and do you think mine may need a relearn from new fluid and filter?

[@737mechanic]

My truck shifts good. I relearn might do the trick.

[@jewllake]

Ha! Your post sounds exactly like the one I did on his video of transmission fluid change. My 2018 6.2 Sierra with the 8 speed was flawless. I had the dealer change the fluid to the new blue label to avoid and upcoming issues and now I have, on occasion, a slightly firm 2-1 downshift and 1-2 upshift. IDK???? it still drives way better than the numerous complaints that have been reported on this trans.

[@wildhawgs2875]

@@jewllake I'm hopeful it's just the technology in the transmission and it trying to relearn the shift points with mostly new fluid. I drove it again yesterday(2nd day after flush) and it seemed a little better. I'm adding the Pulsar Lt later this week and from what I've been reading I'm optimistic about deleting DFM will also help the transmission figure things out a little easier. If not, I'll be doing the relearn as well

[@jewllake]

@@wildhawgs2875 keep us posted. I've had the range afm disabler since the first week I've had the truck. Mine has settled down after the flush (1K miles) but the fact is it was driving smother with the old fluid.

[@wildhawgs2875]

@@jewllake Will do. Have you tried the relearn? I'm no mechanic but makes sense that it could help with the shift points

[@laxbeach2381]

Would you recommend one of these trucks? Or would you just get the 6 Speed or one of the new 10 speeds? I’ve heard aftermarket tunes really help this issue, as well as disabling AFM. Both of those kind of make sense, but I wanted to see your opinion.

[@737mechanic]

Disabling AFM won't help with any shifting problems, In fact, I have tried very hard to see if I can tell when the AFM switches from v8 to v4 and I can't feel anything when it does. The only reason to disable AFM in my opinion is to possibly prolong the lifter life and prevent the oil consumption problem even though they claim to have fixed both those problems on this generation engine. The six-speed may be a better transmission but I think they have their own issues also. I did a video on changing the fluid using the blue label Mobil 1 and it fixed everything except a harsh shift that I was getting every now and then. That's why I did the fast learn. I now have just over 100,000 miles on the engine and trans and both seem fine. That video is here if you are interested. kzbin.info/www/bejne/l2LTf2l-ntiXpNE

[@jewllake]

I guess I'm the lucky one. I bought a 2018 6.2 with the 8 speed brand new. I've had zero issues and I just recently change the filter and the fluid with the new blue label as preventative measure. This weekend I'm installing the SHIFT technology trans thermostat delete.

[@hobohot]

@@jewllake What are your normal driving around temps before? I also have an 18' 6.2 and the temps reach maybe 160 on highway going 80 for 2 hours..

[@isaiasbaez8879]

Can I do this using maxlite

[@737mechanic]

I am not sure what maxlite is?

[@edforthewin8574]

Hey sir, should I run my truck for transmission to reach that temperature or should I let it idle?

[@737mechanic]

Driving it will get the temp up quicker.

[@edforthewin8574]

@@737mechanic thank you so much for your fast reply, I have done the Transmission Fluid Flush and at the end I changed the filter and cleaned the magnet, I have a 2015 GMC YUKON DENALI XL 4X4 6.2L and the book says to add 7.4 quarts after taking out fluid and filter but it doesn’t have the plug to drain the rest out like your video, should I go ahead and add those 7.4 quarts anyway?

[@737mechanic]

@@edforthewin8574 So the 7.4 is if you drain all of it out and even then you need to pull the plug while it is level and running and let the remaining fluid drain out, there shouldn't be much and after it starts to trickle put the plug back in and you will be at the perfect level.

[@edforthewin8574]

@@737mechanic but mine does not have that plug😭

[@737mechanic]

@@edforthewin8574 Is yours the 6 speed?

[@cprflorida]

How do you get to this 8L90 fast learn application, where is this on the application

[@737mechanic]

I show the steps in the video, it is under transmission control module and then special functions.

[@NORCALPYRO_]

Follow up

[@737mechanic]

Still doing good so far.

[@NORCALPYRO_]

​@@737mechanic slipping or shudder or what was your issue

[@737mechanic]

@@NORCALPYRO_ I had both shuddering and harsh shifting. I changed the fluid in this video kzbin.info/www/bejne/l2LTf2l-ntiXpNE and that fixed the shuddering and about 90 percent of the harsh shifts so after about a year after that I did the relearn to see if that would help with the harsh shifts and it took care of almost all of that. Every now and then it will have a harsh shift if everything is just right but I can live with that.

[@LeandroJSilva-fj5fv]

Hey 737 thank you for the video, I have a 2019 8-speed with the same similar problems, been to the dealer 4 times can't fix the problem. How's yours doing ? Thank you

[@737mechanic]

Mine is doing better than ever.

[@LeandroJSilva-fj5fv]

Good thank you I might take mine to a shop tomorrow and get it done

[@421Stroker]

@@LeandroJSilva-fj5fv Did you go get this done? My 2017 Denali with 6.2 is doing the same thing. A few times a week it will shift hard from 1-2, slam when downshifting 2-1 with my foot on the brake, and clunks shifting between R-D and D-R.