Jerky automatic transmission shifting

[Revvdmedia]

My further observations, after 4 drives every cold start exhibited the rough shift going from gear 3 to gear 4. There is a small spike in the revs before it smashes down. At any time, I can command the transmission with the paddles and when manually controlling the gear changes, it has not exhibited the rough shift, not even once so far. I also notice the problem either goes away or becomes unnoticeable once the transmission fluid has warmed up, it becomes progressively less rough after driving a while.

I'd like to theorize what is going on, but for the life of me, I'll just never fully understand automatic transmissions. Running on black magic and voodoo. But my current theory leads me to think it might be something to do with the torque converter, or transmission programming specific to automatic shifting. I don't be able to do any data logging for a bit since the car will be parked for a couple weeks, but I might revisit that thought when I'm back. If anyone is having problems and due for a service visit...feel free to bring it up and report back

 

[Ucinn]

My further observations, after 4 drives every cold start exhibited the rough shift going from gear 3 to gear 4. There is a small spike in the revs before it smashes down. At any time, I can command the transmission with the paddles and when manually controlling the gear changes, it has not exhibited the rough shift, not even once so far. I also notice the problem either goes away or becomes unnoticeable once the transmission fluid has warmed up, it becomes progressively less rough after driving a while.

I'd like to theorize what is going on, but for the life of me, I'll just never fully understand automatic transmissions. Running on black magic and voodoo. But my current theory leads me to think it might be something to do with the torque converter, or transmission programming specific to automatic shifting. I don't be able to do any data logging for a bit since the car will be parked for a couple weeks, but I might revisit that thought when I'm back. If anyone is having problems and due for a service visit...feel free to bring it up and report back

Sounds like the ECU logic needs to be adjusted. If everyone having this problem reports it to their dealer, maybe they will redo the shift logic and fix it. Mine has not exhibited any shifting problems thus far, but doesn't mean it won't in the future.

 

[RVance]

The last sports car I bought was an '06 stang gt.......I was just thinking about the ''bareness'' of the cabin...pretty much nothing compared to the stinger. Couple things irked me about that car, the paint job sucked and the spark plugs needed a miracle to keep them from breaking when removing......and when they broke you were screwed. and the live rear axle...another term for lack of cornering.

I've got 208K miles on my '89. If not for a take-home work vehicle the last 15 years before I retired (and then bought my Stinger), that would have been much more. Lots of oil changes, and replacement of accessories in the engine, but the heads were never off.

 

[Josh16162]

My further observations, after 4 drives every cold start exhibited the rough shift going from gear 3 to gear 4. There is a small spike in the revs before it smashes down. At any time, I can command the transmission with the paddles and when manually controlling the gear changes, it has not exhibited the rough shift, not even once so far. I also notice the problem either goes away or becomes unnoticeable once the transmission fluid has warmed up, it becomes progressively less rough after driving a while.

I'd like to theorize what is going on, but for the life of me, I'll just never fully understand automatic transmissions. Running on black magic and voodoo. But my current theory leads me to think it might be something to do with the torque converter, or transmission programming specific to automatic shifting. I don't be able to do any data logging for a bit since the car will be parked for a couple weeks, but I might revisit that thought when I'm back. If anyone is having problems and due for a service visit...feel free to bring it up and report back

Yup,

I experience the same thing, and only when the car is cold. I'll pay attention to the revs next time it happens as I haven't noticed that before.

 

[JJay03]

Ours does the same abrupt shift when cold. I think its the 3-4 shift but I would have to confirm as my wife is the one who drives it mostly. Once it warms up it is fine and it only does it once or twice. Other then that I love the way the car shift and how it downshifts when slowing down. Sometimes when in comfort mode in auto when you want to get on the gas quickly it downshifts a tad too hard but I cant complain about the shifting overall.

 

[RLittle]

My 2018 GT1 1600 miles just started doing the same thing. 1st to 2nd shift when the trans is cold is abrupt.
As a related matter my 2017 Chevy Trax does the same thing. Once the tranny heats up it is fine.

I suspect these trannys are programmed to "when in doubt, shift hard". I think hard shifts are better than slipping shifts.

 

[Callum]

I recently had mine in to repair a leak in my transmission lines and when I got it back every time I started from auto shut off, it felt like someone drive up the back of me...
The claimed to find nothing wrong when I returned the vehicle to Kia for inspection, but performed the Logic update... but whatever they did fixed it

Mine started doing this recently. If you turn off ISG at a stop light after the engine shuts off. When the engine restarts the car surged forward like somebody ran into the back of you. Damn near gave me whiplash (yes, it's that bad).

car is in service right now

 

[Goodbrand]

Mine started doing this recently. If you turn off ISG (Idle Stop and Go) at a stop light after the engine shuts off. When the engine restarts the car surged forward like somebody ran into the back of you. Damn near gave me whiplash (yes, it's that bad).

car is in service right now

Hopefully the logic update will help you as it did me!!

 

[Revvdmedia]

Hopefully the logic update will help you as it did me!!

I recall a fast shift logic update for the non-shift by wire (GT1 and base)? There is a logic update for GT2 now?

 

[JJay03]

There is a logic update for the base GT? You have any info on this? Maybe I can have it performed when I get the wiring recall done.

 

[Kazz]

Mine started doing this recently. If you turn off ISG (Idle Stop and Go) at a stop light after the engine shuts off. When the engine restarts the car surged forward like somebody ran into the back of you. Damn near gave me whiplash (yes, it's that bad).

car is in service right now

I had that happen once. I laid blame on not having enough foot on the brake pedal at the time. Hate ISG...

 

[Goodbrand]

I recall a fast shift logic update for the non-shift by wire (GT1 and base)? There is a logic update for GT2 now?

This is what was written on my notes from the dealer...

 

[Goodbrand]

There is a logic update for the base GT? You have any info on this? Maybe I can have it performed when I get the wiring recall done.

Issue Number SA341 - Fast Static Gear Shift Logic Improvement (2.0 and 3.3GT)

 

[Revvdmedia]

Issue Number SA341 - Fast Static Gear Shift Logic Improvement (2.0 and 3.3GT)

Yeah the first post and picture showed "shift by cable models" but I'm guessing that's been revised since.

 

[JJay03]

Hopefully the logic update will help you as it did me!!

The TSB looked like it only helped when shifting from park and going into sport mode quickly. You say it also helped with shifting in comfort mode?

 

[Goodbrand]

The TSB looked like it only helped when shifting from part and going into sport mode quickly. You say it also helped with shifting in comfort mode?

Yeah, it’s less jerky

 

[Revvdmedia]

My first to second gear banging issue (V-6) is getting alarming. It went from an occasional misstep to a regular feature in a few hundred miles. NOT tolerable for a $50K car- or any car, for that matter. I will be calling my dealer to set up an appointment after the holidays. There are no issues with other gear changes, and it is not a matter of smoothness. It is a positive slap that bodes ill for the longevity of the trans, IMO.

Hey, I'm digging up an older post. Did you seek resolution for this problem from your dealer? I have the same concerning shift from 3rd to 4th gear. Normally it goes away when the trans warms up but sometimes it lingers on occasion when still warm. Sometimes the shifts are abrupt enough to quite literally feel like you got rear ended, no joke.

Today, my wife, who knows NOTHING about cars even noticed the rough shift. That's bad.

I noted this on my service visit a couple weeks ago, but we were in the middle of a cold snap (still are) and they blamed all of my complaints on "normal due to the cold" even though I told them everything was pre-existing. I will likely push harder on a near future visit, but need it to warm up first because I want the sunroof to start making it's symphony of pops to get as many things addressed in a single visit.

 

[RVance]

Hey, I'm digging up an older post. Did you seek resolution for this problem from your dealer? I have the same concerning shift from 3rd to 4th gear. Normally it goes away when the trans warms up but sometimes it lingers on occasion when still warm. Sometimes the shifts are abrupt enough to quite literally feel like you got rear ended, no joke.

Today, my wife, who knows NOTHING about cars even noticed the rough shift. That's bad.

I noted this on my service visit a couple weeks ago, but we were in the middle of a cold snap (still are) and they blamed all of my complaints on "normal due to the cold" even though I told them everything was pre-existing. I will likely push harder on a near future visit, but need it to warm up first because I want the sunroof to start making it's symphony of pops to get as many things addressed in a single visit.

I only have 8K miles on the Stinger. I will visit dealer at 10K with this issue (and for complimentary oil change) and the wire harness problem. They are 80 miles away. In the meantime, the jerky shifts have become less frequent and mostly when cold. But I still am concerned

 

[Goodbrand]

Hey, I'm digging up an older post. Did you seek resolution for this problem from your dealer? I have the same concerning shift from 3rd to 4th gear. Normally it goes away when the trans warms up but sometimes it lingers on occasion when still warm. Sometimes the shifts are abrupt enough to quite literally feel like you got rear ended, no joke.
Today, my wife, who knows NOTHING about cars even noticed the rough shift. That's bad.

I noted this on my service visit a couple weeks ago, but we were in the middle of a cold snap (still are) and they blamed all of my complaints on "normal due to the cold" even though I told them everything was pre-existing. I will likely push harder on a near future visit, but need it to warm up first because I want the sunroof to start making it's symphony of pops to get as many things addressed in a single visit.

My dealership did the shift logic update, that helped with the really bad start from still that felt like I'd been rear ended, but the rough shift is still there going up the gears

 

[RVance]

My dealership did the shift logic update, that helped with the really bad start from still that felt like I'd been rear ended, but the rough shift is still there going up the gears

Maybe it's "normal." I don't know. I put a shift kit in a Ford C4 back in the 1970s. It hit gears like a race car at all speeds. But there were only 2 shifts, lol. Perhaps this programming is Kia's 8 speed's performance set up.