3.3T Jerky auto transmission (hard downshifts while braking)

[Bhavie]

Sounds like your dealer is taking care of you. Glad to hear it.

Yup! I've been very impressed with them so far.

 

[02EP3]

Update on this.

The downshifts seemed to have gotten worse (considering the cold temps right now). And the reset no longer seem to fix the issue.

Asked my dealer to look into it some more and they ordered a new tranny and just finished the replacement today.

I was surprised they went straight to a replacement and didn't decide to try and diagnose it further (ATF flush), but I'm obviously not complaining.

Now only time will tell if the problem comes back. I suspect it will.

Great info - my 6mo old G70 is mostly ok, the downshifts in comfort while cold were a little rough at times but not worse than braking at low speeds. But more recently maybe 1/10 times while changing drive modes, or shifting from P/N/R, there will be a loud bang and mild lurch. The first time I noticed it was turning on/off eco mode while coasting and using HDA - it was like someone slipped off the clutch from coasting to in gear - I wonder if doing that with very low (~4k) miles 'learned' the transmission some bad habits

 

[Bhavie]

Great info - my 6mo old G70 is mostly ok, the downshifts in comfort while cold were a little rough at times but not worse than braking at low speeds. But more recently maybe 1/10 times while changing drive modes, or shifting from P/N/R, there will be a loud bang and mild lurch. The first time I noticed it was turning on/off eco mode while coasting and using HDA - it was like someone slipped off the clutch from coasting to in gear - I wonder if doing that with very low (~4k) miles 'learned' the transmission some bad habits

First step would be to get the dealer to reset the adaptive and see if it fixes the issue. If it does, your tranny is most likely fine.

The thing I realized is with the whole adaptive learning thing if you play really close attention - all the lower gear shifts aren't as smooth as they could be. I'm talking both downshifts and upshifts. There's a certain roughness to them.

When you reset the adaptives the car feels smoother overall, it's a noticeable difference, atleast for me.

With the new transmission (which has been great so far), only time will tell if the bad shifting comes back.

 

[JCtx]

I really like how my car shifts. It's not the typical super smooth luxury car kind, but I like it that they're firm and positive. And also the paddles react almost instantly, unheard of a regular tranny. The only tranny that shifted quicker, and just by a hair, was my ex-PDK Porsche. I always drive in sport mode, and the downshifts it makes on its own when slowing down are a little abrupt, yes, but nothing to complain about... if you like sporty driving. I almost always drive with the paddles, so no such issues for me. In fact, I was thinking about selling the car for an LC500, and just couldn't justify getting 30 grand for it (it's immaculate, and with only 7K miles), and putting 60K+ more just for a V8 (plus 600 more lbs. Ha ha).

 

[kroom_360]

yesterday I turned back the tuned TCU to its owner and now I am back to my oem TCU.

God I forgot how awful the stock TCU is. It started downshifting harsh and with too much braking again.

I was loving the car for the past 7.5 months with the tuned TCU. It was so smooth and pleasant.


If you want the solution for the downshift issue: just get a tuned TCU!

I will be looking for a tuner that can flash my TCU online through a “SXTH element EK1 lite OBDll flashing tool”

Can I contact you? It is important.

 

[Madtowntom]

Been scanning this thread since I have had the same issue with my 2022 3.3T having harder downshifting from 3rd to 2nd and sometimes from 2nd to first as well. Sensation when coming to an easy stop makes it feel like the brakes are grabbing. Bhavie's (and others) response is right on the money. Get the dealership to run an adaptive transmission reset first to see if this fixes the problem. I had that procedure performed recently and it has significantly improved the jerky downshifting issue for me. Also, FYI, the dealer tech I worked with said I may need to drive 50-150 miles before changes are noticed, although I did notice improvement right away.

 

[Mr. Helper]

Been scanning this thread since I have had the same issue with my 2022 3.3T having harder downshifting from 3rd to 2nd and sometimes from 2nd to first as well. Sensation when coming to an easy stop makes it feel like the brakes are grabbing. Bhavie's (and others) response is right on the money. Get the dealership to run an adaptive transmission reset first to see if this fixes the problem. I had that procedure performed recently and it has significantly improved the jerky downshifting issue for me. Also, FYI, the dealer tech I worked with said I may need to drive 50-150 miles before changes are noticed, although I did notice improvement right away.

I bought a scanner and reset it myself yesterday. I also noticed an improvement right away, not smooth like my old Lexus but a lot better . The scanner also has a section where you can do the re-learn right away. Going to drive a bit with just a reset and see how it goes. If it comes back, im going to try the reset again and do the instant re-learn

 

[XamnosiddA]

I bought a scanner and reset it myself yesterday. I also noticed an improvement right away, not smooth like my old Lexus but a lot better . The scanner also has a section where you can do the re-learn right away. Going to drive a bit with just a reset and see how it goes. If it comes back, im going to try the reset again and do the instant re-learn

What scanner are you using? Can you provide a link? I purchased a Thinkdiag and think it's an awful user experience.

 

[Mr. Helper]

What scanner are you using? Can you provide a link? I purchased a Thinkdiag and think it's an awful user experience.

Not sure i can put links on this site .. But this is the Amazon title:

Autel Scanner MaxiCheck MX808S, 2024 Android 11 US Ver. of MaxiCOM MK808S/ MK808Z, Newer Model of MK808/ MX808, Full Bidirectional as MK808K-BT MK808Z-BT, 28+ Service, OE All System Scan, FCA Autoauth​

Got it on a lighterning deal for $380.
To anyone getting these Autel scanners, make sure run an update before using it. My update took a few hours because I grabbed everything (all cars).

 

[smooth_operator]

Wow, that’s pricy. I’ll be at the dealer if (when?) this happens to my ‘23. No way I’m spending that much to fix their fault.

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[fourthirteen]

I’ll be at the dealer if (when?) this happens to my ‘23.

Let us know how that goes.

 

[chillburgh]

I just picked up my 2019 G70 3.3T w/20k miles from the dealership's service center. I had asked them to "reset the TCU adaptive values using the scan tool." They drove it, reset the TCU values, drove it again, and called me to say that the procedure resolved the behavior. They also told me that the TCU already had the "latest software" and that they didn't change anything else other than the reset.

I can confirm that I drove the car home with all downshifts smooth as butter. I understand that it will likely return eventually, but for now it's great.

Edit: The car was shifting smoothly the following morning after a cool night. The improvement is incredible.

Insist that the dealership reset your TCU adaptive values.

I'm quoting myself here from 1.5 years ago because my car just started having the firm downshifts again at about 31k miles. So I got about 11k miles out of my last TCU adaptive values reset by the dealer. I have an appt on Monday to have it done again, when I will ask the service advisor what the plan is after my warranty expires next year.

 

[chillburgh]

Hello, friends..
I have a lot of information that has not been discussed in this topic and may be new to most of you.

I am a Genesis G80 owner and I am experiencing the same issues that you are facing in your G70 cars. From what I understand, this issue is present in all Genesis and Kia (Stinger) cars that use a transmission called (A8LR1/A8TR1).

I see that the members in this topic are performing a reset of the adaptive values inside the TCM, and this step may fix the issue, but not always, as it depends on fluid pressures and other factors.

After extensive research, I almost reached a solution and found a new technical bulletin dated 2023 for all Genesis cars (G70, G80, G90, GV70, GV80) regarding transmission solenoids. It contains many details, including:

1- Replacing the old solenoids
2- Resetting the automatic transmission adaptive values (Required)
3- Oil pressure characteristics input procedure (Required)
4- TCM adaptive values learning procedure (Required)

Most likely, these procedures will solve the problem.

An important point to note is that this transmission heavily relies on learning the driving style, especially after adaptive values are reset.

In other words, when the adaptive values reset process is performed, you must instruct the transmission to learn the correct driving style, as illustrated below.


I have attached the technical bulletin with all the information, and I hope this benefits everyone.


TSB: 23-AT-001G Genesis Technical Service Bulletin

Sources:

https://www.kstinger.com/automatic_transmission_control_system-495.html

View attachment 57475

I just got back from the dealership to have my TCU adaptives cleared for the 2nd time. They did clear them (and it shifts smoothly now), but they also said that they are going to replace the solenoid(s). They have to order the parts so I'll have to go back there later this week to have that done. I did not mention the solenoids to them - they brought it up themselves. I was just expecting them to clear the adaptives and send me out the door.

 

[Bhavie]

Update on this.

As of Friday, I started experiencing a hesitation/skip when accelerating with more than 50% throttle.

Only happens with more than half throttle, anything less and the acceleration is smooth.

At first I was thinking maybe plugs, but now I am slowly suspecting transmission slip.

There's no noise when it happens, just feels like the car is struggling to accelerate. It'll jerk a few times then go.

RPMs go up smoothly when this happens (part of the reason I don't think its plugs).

Anyone have any thoughts on this? Possibly messed up something during the tranny replacement? Not enough fluid?

 

[Mr. Helper]

Update on this.

As of Friday, I started experiencing a hesitation/skip when accelerating with more than 50% throttle.

Only happens with more than half throttle, anything less and the acceleration is smooth.

At first I was thinking maybe plugs, but now I am slowly suspecting transmission slip.

There's no noise when it happens, just feels like the car is struggling to accelerate. It'll jerk a few times then go.

RPMs go up smoothly when this happens (part of the reason I don't think its plugs).

Anyone have any thoughts on this? Possibly messed up something during the tranny replacement? Not enough fluid?

They put a new transmission in your car right ?

Is the jerkyness gone 100% (does it shift like a normal car .. ie Accord)

 

[Bhavie]

They put a new transmission in your car right ?

Is the jerkyness gone 100% (does it shift like a normal car .. ie Accord)

After the replacement it is much better, however, the shifts are not as smooth as they were in the first few years.

It's not as bad, but you can definitely still feel the downshifts (which wasn't the case after the adaptive reset previously).

I have an appt coming to look at the issue I noted above and will ask them about the replacement. I suspect there may be an issue with the ATF level.

 

[AceRimmer]

I just got back from the dealership to have my TCU adaptives cleared for the 2nd time. They did clear them (and it shifts smoothly now), but they also said that they are going to replace the solenoid(s). They have to order the parts so I'll have to go back there later this week to have that done. I did not mention the solenoids to them - they brought it up themselves. I was just expecting them to clear the adaptives and send me out the door.

Thanks for this. Did you find out anything out about post-warranty? Bought mine used so the warranty expires later this year. Sounds like you deal w/ a cool service manager. Would love to hear what they have to say.

 

[Tonester]

Hello, friends..
I have a lot of information that has not been discussed in this topic and may be new to most of you.

I am a Genesis G80 owner and I am experiencing the same issues that you are facing in your G70 cars. From what I understand, this issue is present in all Genesis and Kia (Stinger) cars that use a transmission called (A8LR1/A8TR1).

I see that the members in this topic are performing a reset of the adaptive values inside the TCM, and this step may fix the issue, but not always, as it depends on fluid pressures and other factors.

After extensive research, I almost reached a solution and found a new technical bulletin dated 2023 for all Genesis cars (G70, G80, G90, GV70, GV80) regarding transmission solenoids. It contains many details, including:

1- Replacing the old solenoids
2- Resetting the automatic transmission adaptive values (Required)
3- Oil pressure characteristics input procedure (Required)
4- TCM adaptive values learning procedure (Required)

Most likely, these procedures will solve the problem.

An important point to note is that this transmission heavily relies on learning the driving style, especially after adaptive values are reset.

In other words, when the adaptive values reset process is performed, you must instruct the transmission to learn the correct driving style, as illustrated below.


I have attached the technical bulletin with all the information, and I hope this benefits everyone.


TSB: 23-AT-001G Genesis Technical Service Bulletin

Sources:

https://www.kstinger.com/automatic_transmission_control_system-495.html

View attachment 57475

It seems that this TSB will only be applicable if the "Check Engine Light" is lit. Assuming this is the solution, what is the trick to get the dealer to apply this TSB if the light is not on? Any other suggestions as to what I should tell the service manager? I have a 2019 G70 3.3T and for several months now I've been experiencing the jerky downshifting. It got so annying, I finally googled it and found a ream of complaints like in this thread.

It sure seems like TCU re-learning would be a temp fix at best, so what is the more permanent fix? Getting a code scanner and re-learning every few months? I guess we have a 10-year powertrain warranty, so I hate to drop the cash on a scanner...

 

[kratos1017]

Is there a confirmed fix for this? I just bought a 2020 G70 3.3T with 50k miles and I am having this issue. I have a date with a dealership next month.

 

[chillburgh]

Is there a confirmed fix for this? I just bought a 2020 G70 3.3T with 50k miles and I am having this issue. I have a date with a dealership next month.

I'm not sure if there's a permanent fix yet, but I can confirm that having the dealership use the scan tool to reset the TCU adaptive values works for about 10,000 mi for me. Twice so far.

C

3.3T Post in thread 'Jerky auto transmission (hard downshifts while braking)'

Aug 24, 2022

I just picked up my 2019 G70 3.3T w/20k miles from the dealership's service center. I had asked them to "reset the TCU adaptive values using the scan tool." They drove it, reset the TCU values, drove it again, and called me to say that the procedure resolved the behavior. They also told me that the TCU already had the "latest software" and that they didn't change anything else other than the reset.

I can confirm that I drove the car home with all downshifts smooth as butter. I understand that it will likely return eventually, but for now it's great.

Edit: The car was shifting...

• chillburgh

•