3.3T Jerky auto transmission (hard downshifts while braking)

[Bhavie]

Glad...so glad I'm not the only one. Did you ever figure out the problem?

This is similar to the downshifts everyone else in this thread is experiencing.

Only fix, that we know of so far, is to reset the adaptive values for the TCU. The only scanners that can do this are the gscan and Hyundai's GDS.

Take it to the dealer and ask them to reset the adaptives. It'll fix the issue but it will come back eventually.

 

[Rocksteady]

This is similar to the downshifts everyone else in this thread is experiencing.

Only fix, that we know of so far, is to reset the adaptive values for the TCU. The only scanners that can do this are the gscan and Hyundai's GDS.

Take it to the dealer and ask them to reset the adaptives. It'll fix the issue but it will come back eventually.

Gotcha. Thanks, man!

 

[jzulli]

I’m having an issue with my transmission, started to notice it since the car had about 20000 km on the clock (car now has 52000 km)

the car doesn’t smoothly downshifts during normal soft braking or in stop and go traffic or at a traffic light
The downshifts are very noticeable and that makes the braking experience unpleasant. Especially when I’m braking very softly, the car brakes very soft (brakes) then it suddenly brakes harder (transmission) then brakes softly again (brakes) then harder again (transmission).
this isn’t something that I’ve experienced in any other car.
the closest other car that does that is my 2018 G80 3.8L but it’s much smoother.

recently I’m experiencing jerky downshifts more often (the downshifts are harder and with a slight noise, sometimes louder) .. I’m not having fun with the car anymore

car modifications: Ark GT-F springs, spacers, wider tyres front and rear (20mm) on stock sport rims (245/40/19 front .. 275/35/19 rear)

the shift points are a little bit different (says other G70 and stinger owners who test drove my car) but this could be due to the fact that I’m running fatter tyres >> bit taller side wall
But this one doesn’t really bother me and it’s still very smooth

could someone suggest a fix for these hard downshifts?
the dealer claims he checked it and it’s normal and he also claims he did a software upgrade to the transmission control module .. but that obviously didn’t help
I know if I keep going to the dealer about it he would blame it on the Tyre size

I had this problem even with stock tyres (tyres changed at 40000 km) .. did try to run the stock tyre size now and that didn’t help also >> so maybe the tyres aren’t the problem here (only transmission effect tyre diameter have is on the final drive ratio)

I’m still hopeful this could be solved through software.. any help or advice?

thank you

My brand new 2021 G80 doing the same thing

 

[Jetaway Dave]

I have a post under Odd AT Behavior also,

I'm familiar with the hard downshifting while braking phenomena. It came from new in my G70, behaves itself as the engine warms up, and has not progressed one way or the other in 30,000 miles.

 

[Bhavie]

It doesn’t happen in all G70s and there’s a good fix for it (reset) if yours happen to have it
I’m pretty sure we’ll see a permanent solution (update) soon

don’t let that scare off from owning this awesome car

Any update on this? You're kind of at the forefront of this problem and trying to fix it.

I went and purchased a diagnostic tool so that I can do the reset myself at home. I can't be bothered with dealer visits for a 2 minute fix. It's ridiculous, especially when the dealers act like you're stupid and have no clue what you're talking about. Easy to have it done each service, but the problem seems to come back sooner than this.

The tool in question is an Autel MP808. Their website and customer support has confirmed that it can complete the reset. Now that I have this tool, and the luxury of a 30 day return, I'm planning on playing around with it as much as I can.

If there is anything that you (or others) want me to check out with the tool please share. Not sure of all the functions, but I'll do whatever I can.

On a side note, the Car Scanner Pro app and a cheap $20 dollar Amazon ODB scanner can reset adaptive values on pretty much all cars besides Hyundai/Kia. Reason being HMG introduced a 'security key request' when sending the special function of a reset to the car, and only specific tools have that function. Pretty annoying stuff.

 

[rmod]

If there is anything that you (or others) want me to check out with the tool please share.

Bhavie, if possible can you please check if you can read the body control module, transmission control unit? Would also like to see if the tool supports break bleeding, electronic parking brake control and any bi-directional controls like fan, fuel pump, lights etc. Thanks in advance.

 

[Bhavie]

Bhavie, if possible can you please check if you can read the body control module, transmission control unit? Would also like to see if the tool supports break bleeding, electronic parking brake control and any bi-directional controls like fan, fuel pump, lights etc. Thanks in advance.

I realize I'm highjacking this thread...so I'll pm you personally. If anyone else wants information feel free to PM me. If there's enough I might make a separate thread.

I was able to reset the adaptive values of the trans using the tool. I've also heard that you're 'required' to go through a learning procedure once the reset is done. Turns out this tool said the same thing. The procedure, called "AT Adaptation Mode", says the following:



This procedure seems much more important to do after resetting the adaptive values than I originally thought. It also seemed extremely difficult to know if you completed it accurately. But, according to the method, it will beep if you were not in parameters. That should make it much easier.

Will give this a try this weekend and report back.

 

[LoLaWy]

I realize I'm highjacking this thread...so I'll pm you personally. If anyone else wants information feel free to PM me. If there's enough I might make a separate thread.

I was able to reset the adaptive values of the trans using the tool. I've also heard that you're 'required' to go through a learning procedure once the reset is done. Turns out this tool said the same thing. The procedure, called "AT Adaptation Mode", says the following:

View attachment 40000

This procedure seems much more important to do after resetting the adaptive values than I originally thought. It also seemed extremely difficult to know if you completed it accurately. But, according to the method, it will beep if you were not in parameters. That should make it much easier.

Will give this a try this weekend and report back.

I don’t think that the learning process is necessary in this case
A simple adaptive reset should be enough to get rid of the downshift problem

As far as i know: learning is only necessary if you rebuild the transmission or change an internal part

 

[Bhavie]

I don’t think that the learning process is necessary in this case
A simple adaptive reset should be enough to get rid of the downshift problem

As far as i know: learning is only necessary if you rebuild the transmission or change an internal part

So when choosing AT Adaptation Mode, it says 'perform this only if transmission has been replaced, or adaptive values have been reset'. Something to that effect.

Just trying to find a way to stop the tranny from learning 'bad behaviour'.

 

[Aquineas]

<snip>

Just trying to find a way to stop the tranny from learning 'bad behaviour'.

Just don't give it a biscuit. "Bad tranny!! No biscuit!!"

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Help support this site so it can continue supporting you!

 

[LoLaWy]

So when choosing AT Adaptation Mode, it says 'perform this only if transmission has been replaced, or adaptive values have been reset'. Something to that effect.

Just trying to find a way to stop the tranny from learning 'bad behaviour'.

The trans is constantly adapting.. on day 0 you will have no issues in both cases so there’s no benefit in doing the learning process

I know 2 persons who have done the learning process at the dealer with similar results as the reset alone>> perfect shifting for several thousand kilometers, after that it slowly starts to be harsher in rare cases then it starts to do it more often until it’s unbearable at some point

I would love to have my own scan tool and just do resets every 5-10k km

 

[Bhavie]

The trans is constantly adapting.. on day 0 you will have no issues in both cases so there’s no benefit in doing the learning process

I know 2 persons who have done the learning process at the dealer with similar results as the reset alone>> perfect shifting for several thousand kilometers, after that it slowly starts to be harsher in rare cases then it starts to do it more often until it’s unbearable at some point

I would love to have my own scan tool and just do resets every 5-10k km

Okay, I'm glad you mentioned this.

Will save myself the hassle of doing it.

Yea, me too. Just sucks that these tools cost so much. It does make sense considering they have to pay all the big manufacturers for a license to use their diagnostic software.

Just wish there was an easier way.

 

[Mikey91]

I just wanna chime in, I have purchased a new 22 G70 3.3T a couple of months ago and I'm having the same problem, it only happens during the warm up though.

 

[G70silver]

I just wanna chime in, I have purchased a new 22 G70 3.3T a couple of months ago and I'm having the same problem, it only happens during the warm up though.

Same with me. Purchased 22 g70 3.3T 2 days ago and noticing rough downshifts. Hope this goes away once I put some miles on it.

 

[LoLaWy]

What do you think of a tuned TCU?
LAP3 , Lozic and Tork are tuning TCU
You think there will be a difference regarding the downshifts?

 

[badfrogg]

So. I am just a lowly Kia Stinger GT owner. Feel free to kick me but, I have the same problems and a lot more with jerky transmission. I came here to see if Genesis was any better. Do you guys have the jerky up shift, where it slams into gear at low speed? Mine also comes out of gear all together sometimes. If all you guys have is the hard downshifts that make you carsick then sign me up! But really. Imagine going to a Kia dealership with these problems. You really are trash at the Kia disco bar, believe me.

 

[Bhavie]

So. I am just a lowly Kia Stinger GT owner. Feel free to kick me but, I have the same problems and a lot more with jerky transmission. I came here to see if Genesis was any better. Do you guys have the jerky up shift, where it slams into gear at low speed? Mine also comes out of gear all together sometimes. If all you guys have is the hard downshifts that make you carsick then sign me up! But really. Imagine going to a Kia dealership with these problems. You really are trash at the Kia disco bar, believe me.

First off, same platform so don't worry, you're more than welcome here.

I think I know what you're talking about. Maybe not as drastic but yes, the upshifts are not as smooth as they should (and used to) be. It's not jerky but feels like it's slipping trying to grab the next gear.

The tranny reset fixes this, but it eventually comes back.

 

[badfrogg]

Dang it. I though maybe trading for a G70 would be easier then getting Kia to fix it. By the way, I test drove another Kia Stinger today. same as mine. It drove and sifted like sweet, sweet butter. For 30 minutes I got to experience what it would be like to have a proper car.

 

[Bhavie]

Dang it. I though maybe trading for a G70 would be easier then getting Kia to fix it. By the way, I test drove another Kia Stinger today. same as mine. It drove and sifted like sweet, sweet butter. For 30 minutes I got to experience what it would be like to have a proper car.

Ask your dealer, or an independent shop with a gscan, to reset the adaptive values for the transmission.

If it's bothering you that much buy a tool that can do it for you anytime! Autel has a few in the 800-1000 range that'll work.

 

[Mikey91]

So. I am just a lowly Kia Stinger GT owner. Feel free to kick me but,

Dude don't think that lowly of yourself