3.3T Jerky auto transmission (hard downshifts while braking)

[ominousone]

Mine, on my 2019 3.3T, was replaced with around 40k miles las summer.

 

[AndersC]

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

Has there been an official fix from Genesis yet? or is it still just to reset adaptive values

 

[chillburgh]

Mine, on my 2019 3.3T, was replaced with around 40k miles las summer.

They replaced my transmission at almost the same time - 2019 3.3T with 38k miles. I haven't gone more than 4k miles since the replacement so I can't yet say if it fixed the problem. Historically, my problem would return about 10k miles after I got the TCU adaptive values cleared. I'm planning on selling the car soon so I won't find out.

 

[ominousone]

I've got over 101k miles on the replaced tranny and so far so good.

 

[Riley]

This car company doesn't seem to care. I have a 2019 3.3 with a roaring 29K on the odometer and I had my adaptives reset at I am guessing 18000 miles. O f course I am having the same problems again. I took it back to the same dealer which took two times to convince the 1st time. And, I am not sure if this is a problem everywhere but they are reall short handed on techs.They said there is no problem. I raised bloody hell and the service manager said the same thing unable to duplicate. I asked them to just reset the Adaptives and sent them screen shots from the forum of bills showing the repair.They just disregarded that. I not sure they ever drove the car as when I picked it up after 1 month it did the same crap the minute I pulled onto the street. I also got Genesis of America involved. They want you to feel like they are helping, but seem to be of little help. They said, take it to another dealer. I looked at the 2 closest dealers and they get 2.7 stars on YELP and the reviews are bad. Now What?

 

[Riley]

Mine, on my 2019 3.3T, was replaced with around 40k miles las summer.

How did you get that to happen?

 

[ominousone]

How did you get that to happen?

I was having the hard downshifts. I made the appt and brought it in. They tried to re-program and that wasn't working. They got Genesis involved and replaced the tranny. They had the car for about 2 weeks. It was easier than what I often see, to get that taken care of, under warranty obviously.. Luckily it was summer and I "had" to drive my Vette..or my ZX14R Ninja.

 

[Riley]

Can anybody recommend a dealer in the Los Angeles area for the tranny problem?

 

[AceRimmer]

This car company doesn't seem to care. I have a 2019 3.3 with a roaring 29K on the odometer and I had my adaptives reset at I am guessing 18000 miles. O f course I am having the same problems again. I took it back to the same dealer which took two times to convince the 1st time. And, I am not sure if this is a problem everywhere but they are reall short handed on techs.They said there is no problem. I raised bloody hell and the service manager said the same thing unable to duplicate. I asked them to just reset the Adaptives and sent them screen shots from the forum of bills showing the repair.They just disregarded that. I not sure they ever drove the car as when I picked it up after 1 month it did the same crap the minute I pulled onto the street. I also got Genesis of America involved. They want you to feel like they are helping, but seem to be of little help. They said, take it to another dealer. I looked at the 2 closest dealers and they get 2.7 stars on YELP and the reviews are bad. Now What?

Damn, that sucks and I don't like the sound of it. Like you, I'm low mileage. My 2019 3.3 had the same problem at 18k, was reset and has been just fine since. But I just passed 28k so now you got me worried.

In regards to tech shortages, this is absolutely true. I live in UT and have had the same problems w/ dealership issues and slooooowwwww turnaround times. I've been there over 12 times the past 20 months! I left a long diatribe about that in another post (and Google review). Talking w/ others in the repair business there is major tech shortages nationwide. The problem is w/ everyone being told to go to college for decades, meaning blue-collar jobs are getting thinned out. Took them 4.5 hours to 'diagnose' a loose sunroof trim piece! It would take literally 2 seconds. I finally bitched to the service manager. She was actually understanding and tried to make it better.

BUT they screwed up- again (long story)! After more bitching and telling them I'm ready to dump the car (and Genesis brand), she asked what will it take to make it better. My infotainment delaminated a second time in 1 year and 2 weeks; just after warranty expired, of course! Told her a free repair, full tank of gas and loaner, plus pick-up and delivery of vehicle (my dealer is 30 miles away). She said, "Done!" But it's been 2 weeks now, I've contacted her directly (she gave me her personal number) and she's said she's waiting on the parts manager to get it ordered.

It's a great car when working right but I've certainly been soured by the poor quality control and terrible dealer experience. We'll see if it ever actually gets done. Wish I had any help to give you but sadly we're in similar boats, ready to throw the captain overboard. Hope you get yours solved.

 

[Slip_Angle]

The hard 3-2 downshift is a common thing. It’s partially due to the TCU learning how the driver drives the car. You can get an OBD reader that can do the reset and do it from home. Another alternative is getting a tuned TCU.

The transmissions themselves are not failing and very very stout.

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[Riley]

So my car was at Santa Monica Genesis for a month. This dealer is incompetent and useless. Couldn't duplicate the transmission problem which is in you face when cold and also asked them to listen to a rear suspension noise, sounds like brake springs to me. They said this is the sunroof which has never been opened and the sound is clearly not coming from there. Not sure how they are still in business. Went to Westlake Genesis today completely different experience, Nice people, professional and they have heard of this problem,Imagine that? My advisor has heard of resetting the adaptives. That's probably what they will do { I hope} although I know it is only a temporary solution. Amazing that Genesis has not solved this problem.

 

[Riley]

So the dealers says that all is normal. ??? And well, no it's not. They say, Everything is within normal parameters. Additionally on the G70 model it is not uncommon for drivers to feel a pronounced downshift especially during colder starts.This is attributed to the vehicles sport tuned dynamics and the way the throttle body manages airflow. Genesis says this is normal. Gee, it didn't have this problem when I purchased the car and at about 17000 miles the 1st time the car had this problem resetting the adaptives miraculously made the problem disappear. Anybody have any suggestions?

 

[Daba11]

Can anybody confirm if a TCU tune fixed JDS in their car? Currently own a 2020 G70 3.3T SP and the JDS is driving me insane to the point where I'm considering selling the car for the M340i I was originally looking at. However, if a TCU tune can solve this problem, I'm all for it.

 

[ejguillot]

Can anybody confirm if a TCU tune fixed JDS in their car? Currently own a 2020 G70 3.3T SP and the JDS is driving me insane to the point where I'm considering selling the car for the M340i I was originally looking at. However, if a TCU tune can solve this problem, I'm all for it.

I have a 2019 3.3T RWD with the BMS bolt on catalog thrown at it, and that includes the TCS tune.

With the TCS tune in place, the jerky downshifts pretty much went away. In exchange the 1-2 and 2-3 upshifts on light to medium throttle are sometimes a little too snappy, but I find that a tradeoff worth making.

Other features of the tune:
WOT shift points lowered to keep the engine at peak power when bolt on upgrades are added (with stock turbos)
Launch control mode reconfigured to let you leave at the RPM of choice (and with a JB4, at the boost pressure of your choice)
Shift times and delays minimized, to maximize acceleration and power handling.

 

[Riley]

Can anybody confirm if a TCU tune fixed JDS in their car? Currently own a 2020 G70 3.3T SP and the JDS is driving me insane to the point where I'm considering selling the car for the M340i I was originally looking at. However, if a TCU tune can solve this problem, I'm all for it.

So the this dealer reset my adaptives and all is finally pretty good. Of course, how long this will last is up in the air.