Hard downshift transmission

[5tinger]

I just bought a '22, and the down shifts when coming to a stop are rougher than any car i've ever owned. It is not smooth at all for me.

Strange. Do you have videos demonstrating the issue?

 

[mikser100]

Strange. Do you have videos demonstrating the issue?

It's impossible to video. It's a feel kind of thing. When mine was doing it, it feels like the car is trying to do braking for you using the transmission, and not in a smooth or helpful way. More like downshifting a 1000 rpms too soon, so much so that the passengers jerk forward with each lurch. Mine did it from gear 4 to 3, and 3 to 2 when rolling to a stop, even without using the brake. My wife wouldn't drive my car till I got it fixed because of it lol.

Another note, is when using manual or paddle shift, it was smooth as ever, which is how I drove full time in city traffic after it got so bad, just to avoid the issue. That is what led me initially to look into learned gearbox shift settings and not something mechanical due to it shifting just fine out of automatic mode.

 

[5tinger]

It's impossible to video. It's a feel kind of thing. When mine was doing it, it feels like the car is trying to do braking for you using the transmission, and not in a smooth or helpful way. More like downshifting a 1000 rpms too soon, so much so that the passengers jerk forward with each lurch. Mine did it from gear 4 to 3, and 3 to 2 when rolling to a stop, even without using the brake. My wife wouldn't drive my car till I got it fixed because of it lol.

Another note, is when using manual or paddle shift, it was smooth as ever, which is how I drove full time in city traffic after it got so bad, just to avoid the issue. That is what led me initially to look into learned gearbox shift settings and not something mechanical due to it shifting just fine out of automatic mode.

A video showing both speed & rpm tachometers slowing down from say 50 km/h without braking would be pretty helpful.

As mentioned, my 2019 shifts to lower gears when coasting to a stop, it is noticeable, but definalty not harsh. The rpm would be between 1000 to 1500rpm

 

[mikser100]

A video showing both speed & rpm tachometers slowing down from say 50 km/h without braking would be pretty helpful.

As mentioned, my 2019 shifts to lower gears when coasting to a stop, it is noticeable, but definalty not harsh. The rpm would be between 1000 to 1500rpm

We're talking speeds of like 20 or 15 miles an hour without depressing the gas decelerating in comfort mode. The tachometer doesn't show you much really. Maybe it would, but mine is already resolved by resetting the learned values, so anyone else can feel free to try. still might not learn much from that exercise if we have a fix that works already.

 

[Thomby]

It's impossible to video. It's a feel kind of thing. When mine was doing it, it feels like the car is trying to do braking for you using the transmission, and not in a smooth or helpful way. More like downshifting a 1000 rpms too soon, so much so that the passengers jerk forward with each lurch. Mine did it from gear 4 to 3, and 3 to 2 when rolling to a stop, even without using the brake. My wife wouldn't drive my car till I got it fixed because of it lol.

Another note, is when using manual or paddle shift, it was smooth as ever, which is how I drove full time in city traffic after it got so bad, just to avoid the issue. That is what led me initially to look into learned gearbox shift settings and not something mechanical due to it shifting just fine out of automatic mode.

Sounds like my 2022. It wasn't every stop, but pulling up to red lights under steady braking there would be a noticeable lurch or two (4-3 and 3-2), significant enough that I thought the car was detecting stopped traffic and braking harder. I started easing off the brake as I slowed to compensate.

Don't think it was double downshifting because I never noticed significant rev jumps, so it was probably being too aggressive with the torque converter. Felt like if I downshifted a manual and let the clutch out with no rev match.

But running the Gearbox Match for a 2020 model on the Xtool A30D seems to have eliminated it. It's been several days and I've driven in multiple drive modes, with no jerky stops.

 

[Thomby]

A video showing both speed & rpm tachometers slowing down from say 50 km/h without braking would be pretty helpful.
As mentioned, my 2019 shifts to lower gears when coasting to a stop, it is noticeable, but definalty not harsh. The rpm would be between 1000 to 1500rpm

We're talking speeds of like 20 or 15 miles an hour without depressing the gas decelerating in comfort mode. The tachometer doesn't show you much really. Maybe it would, but mine is already resolved by resetting the learned values, so anyone else can feel free to try. still might not learn much from that exercise if we have a fix that works already.

Agree that video wouldn't help -- it'll just look like a single downshift. It's not the amount of rpm increase, it's the rate at which it's going back into gear (torque converter pressure, I assume). Imagine clutching out of 3rd gear around 1000 rpm, putting it into 2nd, and just backing straight off the clutch with no throttle. Your revs would jump to <2000 rpm, but you'd lurch forward in your seat.

 

[cycodrama]

Strange. Do you have videos demonstrating the issue?

Don't have a video, but best I could describe is it almost feels like if a front crash detection system kicked in for a second and forcefully tapped the brakes. Just coasting in for a stop and it does it. It is just a downshift, but literally feels like someone hit the brakes (and you weren't expecting it). I have owned performance cars before with more horsepower and never experienced such a lurch on a downshift. Now in my RC-F I would manually downshift into 2nd gear at like 40MPH to jump the RPMS to like 5k and that is the closest I can say the stinger feels like - but I was expecting it in the RC-F because I did it....the stinger catches you off guard so the lurch feels more pronounced.

 

[LOCKSTEP]

I have a 22 GT 2 and it’s doing the same thing. It’s driving me absolutely crazy. I brought it into Kia, they did the reset and it changed nothing. I had the tech drive the car with me and of course at that time the car did not shift hard at all, I’m losing my mind over this!

 

[Thomby]

Try the Gearbox Match function on the Xtool A30D. They emailed after I'd run the 2020 model and returned it, to say they'd updated and added 2022

 

[cycodrama]

I have a 22 GT 2 and it’s doing the same thing. It’s driving me absolutely crazy. I brought it into Kia, they did the reset and it changed nothing. I had the tech drive the car with me and of course at that time the car did not shift hard at all, I’m losing my mind over this!

I bought the code reader from amazon linked in this thread and followed the procedures to do it myself. I want to say it fixed it and is about 90% better. Worth it for the 100$ I spent.

 

[Daeric23]

I ordered the Xtool A30D as recommended in the other thread so that I’m able to reset it myself, hopefully tomorrow. I took it to the dealer awhile back to get them to do it but it returned later on.

I’m planning to do it again and see how long it lasts. I read that someone does it every oil change. What I’m hoping is that later on in the cars life, that the transmission doesn’t just CRAP out hope it’s just a TCU issue (I have 30k on my 2020)

Does this happen to the 2.0 Stingers as well? Wasn’t sure if it shares the same transmission.

Regardless, it seems like a good amount of people have this issue so I’m surprised KIA hasn’t come out with a fix??

 

[LOCKSTEP]

I bought the code reader from amazon linked in this thread and followed the procedures to do it myself. I want to say it fixed it and is about 90% better. Worth it for the 100$ I spent.

Awesome! I ordered it too yesterday and should have it today . It would be excellent if it solves it, Thanks.

 

[LOCKSTEP]

I tried following these steps and got a notice that it’s not supported. Any suggestions?

 

[Kodiack]

Go to manual selection and select 2020 Stinger and do it that way, I heard someone else say they had the same issue.
Its the same engine and transmission, the 2022 just hasnt updated yet to support it.

 

[Thomby]

Go to manual selection and select 2020 Stinger and do it that way, I heard someone else say they had the same issue.
Its the same engine and transmission, the 2022 just hasnt updated yet to support it.

That was me, a week or so into January. They came back and said 2022 had been added, and I'd assume 2021 as well (they're probably all identical), but I had returned the unit by then, so maybe someone else can confirm.

 

[idadoc]

Bought device this week for 22 Stinger GT. Updated all software. Can confirm still had to use 20 profile, not 22. Worked fine with 20 profile and shifting so much better on coasting to a stop.

 

[Audible Silence]

Maybe I should give this a shot. It's only when coming to stop signs and red lights. But that last downshift feels really aggressive.

 

[monro]

Just bought a 2020 GT2 and I'm noticing this issue pretty much every time I slow down to a stop. Seems worse in Sport mode, which is basically what I like to keep it in. Brought it back to Kia, who told me that: A. It's normal, because B. It's a dual-clutch transmission.

Regardless, they did the adaptive transmission reset.. I was told to drive it conservatively for a couple of days in Comfort mode. I did so for almost 2 weeks (in and still noticed the issue). And now, yeah - basically no change from before I brought it back to Kia. Still hard downshifts at around 25 mph and 15 mph.

Any suggestions or updates from those of you who've been dealing with this problem lately? Should I get an Xtool A30D as suggested above and try it myself? Or is not worth it, since the dealership supposedly already tried the reset??

Thanks for any advice!

 

[87and66]

Just bought a 2020 GT2 and I'm noticing this issue pretty much every time I slow down to a stop. Seems worse in Sport mode, which is basically what I like to keep it in. Brought it back to Kia, who told me that: A. It's normal, because B. It's a dual-clutch transmission.

Sad when a dealer doesn’t know anything about the cars they sell. It’s not a dual clutch. It’s a standard torque converter automatic

 

[mikser100]

Just bought a 2020 GT2 and I'm noticing this issue pretty much every time I slow down to a stop. Seems worse in Sport mode, which is basically what I like to keep it in. Brought it back to Kia, who told me that: A. It's normal, because B. It's a dual-clutch transmission.

Regardless, they did the adaptive transmission reset.. I was told to drive it conservatively for a couple of days in Comfort mode. I did so for almost 2 weeks (in and still noticed the issue). And now, yeah - basically no change from before I brought it back to Kia. Still hard downshifts at around 25 mph and 15 mph.

Any suggestions or updates from those of you who've been dealing with this problem lately? Should I get an Xtool A30D as suggested above and try it myself? Or is not worth it, since the dealership supposedly already tried the reset??

Thanks for any advice!

Read earlier posts including the one I posted. This thing is fixed by grabbing an aftermarket tool to reset the shift points and clear adaptive values yourself. Kia dealers either don't know how to do it properly, are resetting the wrong thing, or are doing nothing and just saying they did it. Have to take into your own hands unfortunately on this one. Good news is when you get the right tool for it (see my earlier post for that) you can do it anytime you want. Good luck