3.3T Jerky auto transmission (hard downshifts while braking)

[pereps1]

Hi Everyone, I just bought a used 2019 G30 3.3T with 19k miles. The first time I drove it, I noticed this transmission jerkiness when slowing to a stop or slowing down to turn slowly. I though I had to get used to driving a powerful car, but ow I realize this is wrong. Using the ECO mode seems to be less noticeable. I'll try turning off the "coasting" switch.
I imagine this could be solve by a Software update. Anybody knows how to request a SW update for this issue?
Also, do dealers charge you for resetting the "adaptive" as people mention in this thread? How much?

 

[cguti084]

2020 G70 3.3t here, bought it new in July 2020, I have 21,300 miles and the jerky 3rd to 2nd has been happening for past couple weeks. I should’ve bought a manual car! It’s really annoying and making me want to get rid of this car. It only happens for about 7 miles when cold , but my drive to work is 9 miles. I get the issue again going home. I have a Jb4 with intakes running Map2. Haven’t gone to the dealer because I know they suck. I already had the brake pad juddering issue and they acted clueless ans
Couldn’t replicate the issue. Yes car shaking when braking is not normal
Idiots (dealership). Took it to independent shop and changed my pads, problem has been fixed. I thought of changing the tranny oil with Motul and hoping that would fix it then I came across this thread.

I guess it’s a known issue, I hate the current car market, can’t get rid of this thing. I’m getting a Manual next !

 

[Mikey91]

2020 G70 3.3t here, bought it new in July 2020, I have 21,300 miles and the jerky 3rd to 2nd has been happening for past couple weeks. I should’ve bought a manual car! It’s really annoying and making me want to get rid of this car. It only happens for about 7 miles when cold , but my drive to work is 9 miles. I get the issue again going home. I have a Jb4 with intakes running Map2. Haven’t gone to the dealer because I know they suck. I already had the brake pad juddering issue and they acted clueless ans
Couldn’t replicate the issue. Yes car shaking when braking is not normal
Idiots (dealership). Took it to independent shop and changed my pads, problem has been fixed. I thought of changing the tranny oil with Motul and hoping that would fix it then I came across this thread.

I guess it’s a known issue, I hate the current car market, can’t get rid of this thing. I’m getting a Manual next !

Around 13,000 miles on my 22 3.3T, still having this problem, I suspect it has gotten worse, I also usually have short trips since I work from home, most of my rides I have to deal with this, I have not gotten used to it, it just feels so unnatural and frustrating.

My tires (Michelin summer maximum performance) almost need to be replaced and my ride lately has been pretty rough, I don't know if this is also related to the tires but I feel like I've been having way too much body roll no matter how slow I try to turn, overall the vehicle has been very uncomfortable to drive, combine that with the transmission problem and it becomes very annoying.

I love the car overall but I wish those issues were fixed.

 

[Bhavie]

Just take it to the dealer and have the adaptives reset. Minor inconvenience but if you have a good dealer it's something you can have done every few months.

It sucks, I agree, but it's nice knowing there is a fix, even if it's temporary.

Also, @Mikey91, are you getting body roll or does the back end feel like it's skipping/hopping during turns? I get the latter and my tires are almost shot. It disappeared when I swapped to winters so I know it's a tire thing. Something to think about if it's similar for you.

 

[Mikey91]

Just take it to the dealer and have the adaptives reset. Minor inconvenience but if you have a good dealer it's something you can have done every few months.

It sucks, I agree, but it's nice knowing there is a fix, even if it's temporary.

Also, @Mikey91, are you getting body roll or does the back end feel like it's skipping/hopping during turns? I get the latter and my tires are almost shot. It disappeared when I swapped to winters so I know it's a tire thing. Something to think about if it's similar for you.

My rear tires are about in the early 'yellow' category on my tread depth tool, I think around 5-6 32nd, the front are better. But the rear tires will almost always spin if I try to push the car hard, even in Sport when traction control is off, I know the tires are one of the best but holy cow I barely used them for less than a year and I don't drive roughly either.

Right now I barely use Sport mode as I always get tire spin unless I wait a few seconds to let the tires get a good grip, but that really takes the fun out of it haha

 

[Mr. Helper]

Been dealing with the jerky transmission when slowing down .. only 500 miles on the car. I have my guage set on oil/torque/turbo and noticed it gets better when the oil heats up to the half way point... Wondering now if this is oil getting to temp. It would explain why the jerkiness is still there on warm/hot days cold starts.

 

[Mr. Helper]

Been dealing with the jerky transmission when slowing down .. only 500 miles on the car. I have my guage set on oil/torque/turbo and noticed it gets better when the oil heats up to the half way point... Wondering now if this is oil getting to temp. It would explain why the jerkiness is still there on warm/hot days cold starts.

 

[jetrep]

My 2019 has about 34k miles now. It does have some minor downshift harshness. I mentioned it to the dealer and they did the computer reset. It changed nothing. It's not bad enough to be a real issue right now but I'll be mentioning it next time I bring it in. I suspect it's not bad enough to be obvious so they'll brush it off as no problem found.

 

[chillburgh]

I recently bought a Certified Pre-Owned 2019 3.3T AWD. It has 19k miles on it. I experience the downshift braking in all drive modes, even Eco. It is quite strong and very noticeable by all in the vehicle. It does this until ... something ... seems to get warmed up enough that it goes away. Then it runs smoothly. This usually takes about 15-20 min of driving.

 

[JCtx]

Been dealing with the jerky transmission when slowing down .. only 500 miles on the car.

Is this in full auto (no paddles)? And in which driving mode? But something doesn't sound right, especially on a Genesis. My 2021 Palisade Calligraphy is super smooth, and the tranny is made in house. Just looked at the window sticker of my G70 3.3T SP, and both engine and tranny are Korean, so maybe an older design? But sounds disappointing. Hope it shifts better in sport mode, which is what I almost always use in most of my cars. By the way, also bought a Santa Fe Calligraphy with this car, and the tranny was AWESOME. Told my wife this thing shifts like my freaking ex-Porsche with a PDK (dual-clutch), and it IS a dual-clutch 8-sp. No wonder. That's what this car should have, and not on an SUV. Ha ha. Oh well. Probably after the new design. But at least it smooths out after it gets hot. Hopefully it'll improve after breaking in some. We'll see.

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[jetrep]

Is this in full auto (no paddles)? And in which driving mode? But something doesn't sound right, especially on a Genesis. My 2021 Palisade Calligraphy is super smooth, and the tranny is made in house. Just looked at the window sticker of my G70 3.3T SP, and both engine and tranny are Korean, so maybe an older design? But sounds disappointing. Hope it shifts better in sport mode, which is what I almost always use in most of my cars. By the way, also bought a Santa Fe Calligraphy with this car, and the tranny was AWESOME. Told my wife this thing shifts like my freaking ex-Porsche with a PDK (dual-clutch), and it IS a dual-clutch 8-sp. No wonder. That's what this car should have, and not on an SUV. Ha ha. Oh well. Probably after the new design. But at least it smooths out after it gets hot. Hopefully it'll improve after breaking in some. We'll see.

We also have a 2021 Santa Fe. The transmission works quite well. Sadly though ours is on the second transmission. At about 15k the transmission started to not always want to upshift. It started off as an occasional problem but then became very frequent. New transmission has been great for about 12k miles.

 

[JCtx]

We also have a 2021 Santa Fe. The transmission works quite well. Sadly though ours is on the second transmission.

Oh man; sorry to hear that. But hope that issue is ironed out by now. Crossing fingers. Replacing a tranny is a major job on a FWD chassis; the front of the car has to be disassembled. But glad it's doing good now. And it didn't want to shift up even with the paddles? At any rate, I wouldn't be happy about that. Ha ha. I was surprised to learn it's a dual-clutch tranny, especially on an SUV, and with a 3,500-lb tow rating. Did you tow with it before the failure? And hey, do you know of a Santa Fe forum? I need to find one, to look for other potential issues, and be informed about that. And any potential issues that could be present when new, like the A/C issue on the G70. The G70 should arrive next week, and the SF 5 days later. Thank you.

 

[nchisler]

My 2019 G70 3.3T AWD has the same issue of hard downshifting around 12 mph when the car is cool that many of you have described above. I got the car in Dec '20 and didn't have the issue until the Fall/Winter of '21. I've had the dealership look at it twice and was told that they couldn't replicate the issue...which blows my mind because on the second visit, the car was left overnight. I asked for the shop foreman to be the first to drive it in the morning. It ALWAYS does it when first driven...so not sure how they couldn't replicate it. Anyway, I recently called the corporate office and now have a case opened up on my issue. Will see what happens and will keep you updated.

 

[[NOBODY]]

Corporate has ignored my issue with that, and other issues. I have several outstanding issues with my car that no one will repair. Caveat Emptor

 

[JCtx]

That eliminates a module (software) issue, right? Sounds like a solenoid/valve is starting to malfunction, for the sounds of it. What I'd do if I had the issue is to wait until it gets bad enough that it cannot be ignored, especially with a lot of warranty left. With stupid dealers nowadays, I have learned it's a waste of time to try to get a mild and not easy to replicate issue resolved. Once it gets bad enough, ECU should throw a code, or at least make it more easily repeatable (hot or cold), where it couldn't be ignored anymore. But as the 'OCD type', I wouldn't be happy with that either. Ha ha. Good luck, and please keep us posted.

 

[LoLaWy]

Does getting a tuned TCU resolve this issue?

 

[nchisler]

Does getting a tuned TCU resolve this issue?

Earlier in this thread, people have stated that resetting the TCM and ECU resolved the issue, but only temporarily. I finally got contacted from corporate regarding my case that was opened on this issue. I have another (3rd) appointment with the local dealership. I'm gonna leave the car overnight and then return in the morning for a test drive with the shop foreman. Fingers crossed that it happens because recently the temps have been pretty high (90's high/70ish low) and the issue hasn't gone away, but has become much less noticeable. I'm sure that after going through this effort, the car will run smooth as butter when I'm with the tech. Still not sure what corporate will do...the dealership is supposed to report back following the appointment.

More to come...

 

[Bhavie]

Earlier in this thread, people have stated that resetting the TCM and ECU resolved the issue, but only temporarily. I finally got contacted from corporate regarding my case that was opened on this issue. I have another (3rd) appointment with the local dealership. I'm gonna leave the car overnight and then return in the morning for a test drive with the shop foreman. Fingers crossed that it happens because recently the temps have been pretty high (90's high/70ish low) and the issue hasn't gone away, but has become much less noticeable. I'm sure that after going through this effort, the car will run smooth as butter when I'm with the tech. Still not sure what corporate will do...the dealership is supposed to report back following the appointment.

More to come...

Please keep us updated!

 

[LoLaWy]

Does getting a tuned TCU resolve this issue?

I finally installed a lozic TCU (shift pressure 2/ auto upshift/ torque limiter on/ -5% shift pattern/ E shifter)
I borrowed it from a buddy to test the downshift behavior

This is insane: on eco and comfort mode I can’t even tell that the car is downshifting from 3rd to 2nd and from 2nd to first
It was so shocking that I had to monitor the gearbox via OBDll (JB4) to see in which gear the car is.
I monitored the shifts and it went from 6th to 1st so smooth that i was speechless.
Way smoother than the stock TCU in its best day (even after a reset)

On the stock TCU (freshly reset) you could feel the downshifts like a hard braking but with no downshift shock. a couple thousand kilometers after the reset the downshift shock appears.

With Lozic TCU I can’t even tell if the car is downshifting. No brake feeling while downshifting.

On sport mode you can notice that the car is downshifting (just like stock), you feel a medium braking with every downshift .. but after the tune you could also feel it downshifting to 1st gear just before the car stops at around 7-10 km/h (never felt the 2nd to 1st downshift on the stock TCU) .. but no downshift shocks.

On sport mode when you give it medium to full throttle then let off the gas, the car holds the current gear for some time and doesn’t upshift like the stock tune .. I like that!

After installing the Lozic TCU the car upshifts automatically on full throttle 1st to 2nd on 5500rpm .. 2nd to third on 5700rpm .. 3rd to 4th on 5900rpm and so on …
That’s very clever and keeps the car pulling forward with maximum torque.

I did lose the “eco coasting feature”, but that’s not a very big deal for now. Did talk to Lozic about it before and he was shocked that a person who orders a performance tuned TCU asks for a fuel saving feature. He said he didn’t pay attention about it because nobody has ever mentioned it to him. Maybe he can add it for you if you specifically ask him to do it. But I remember him saying that it can’t work with the new tuning for some reason.
Not a deal breaker for me.

Another thing that I didn’t like about it: you can either choose auto upshift or manual upshift on manual mode. The stock TCU does automatic upshift for you to prevent you from staying on redline if you leave stability control on. And it allows you to stay on redline if you disable stability control.
For someone like me who likes to drift from time to time the tuned TCU will always upshift automatically when it reaches redline even if I turned stability control off, which will ruin the drift.
And if I would choose to order a TCU with manual upshift and did forget to upshift while accelerating hard it will stay on redline and lose momentum.
The stock TCU solution is the best middle ground for my case. But maybe he can reprogram the TCU to do that like the stock upshift logic.

This tuned TCU made me very happy today but it’s obviously still learning and I won’t give it my final judgment just yet. Will report back to you in a couple thousand kilometers.

 

[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.