The hard downshifts in sport mode

[livingSmoke]

For me the dealer said the problem (or more specifically my build date car) did not require that TSB, and so they only reset the adaptives, presumably by disconnecting the battery for 10 minutes. I think that resets ALL the adaptives from what I've read. But yes, going on over a month now since the reset and all stops remain smooth in comfort mode. The engine breaking when coming to a full stop feels barely noticeable now. Let us know if that works for you too!

Thanks, I will try this and report back.

 

[livingSmoke]

Thanks, I will try this and report back.

It didn't work. After disconnecting the battery and leaving it be 20 minutes, Ive tested it aboit a week. No noticeable difference. I should note that these hard downshifts seem more prominent when the car is cold. Afterward it is still there but not as strong.

 

[G70 Owner]

It didn't work. After disconnecting the battery and leaving it be 20 minutes, Ive tested it aboit a week. No noticeable difference. I should note that these hard downshifts seem more prominent when the car is cold. Afterward it is still there but not as strong.

thanks for testing! they must be doing something else to 'reset the adaptives'

 

[OnTheRoad]

thanks for testing! they must be doing something else to 'reset the adaptives'

I think you have to short the terminals or disconnect the ECU as well for a full factory reset.

 

[Ezpotato]

It didn't work. After disconnecting the battery and leaving it be 20 minutes, Ive tested it aboit a week. No noticeable difference. I should note that these hard downshifts seem more prominent when the car is cold. Afterward it is still there but not as strong.

I just bought a 2018 gt. Did not notice this the first couple days i had it, then I noticed it was doing it at any stop in any mode. I thought I was just a fluke but the next day did it again but I did notice that it goes away when the car has been driven for a little bit. now whenever the car is cold probably for the first 15 to 20 minutes of driving I feel the jerkiness. And then it goes away. Just like you're describing. I'm going to the dealer I bought it from to pick up a trim piece this week and I'm going to ask them to reset the TCU however that is done. Even my wife had noticed and asked if that's how it's supposed to slow down

 

[livingSmoke]

I just bought a 2018 gt. Did not notice this the first couple days i had it, then I noticed it was doing it at any stop in any mode. I thought I was just a fluke but the next day did it again but I did notice that it goes away when the car has been driven for a little bit. now whenever the car is cold probably for the first 15 to 20 minutes of driving I feel the jerkiness. And then it goes away. Just like you're describing. I'm going to the dealer I bought it from to pick up a trim piece this week and I'm going to ask them to reset the TCU however that is done. Even my wife had noticed and asked if that's how it's supposed to slow down

Please let me know how it goes. Im just dealing with the issue because it goes away after about 20 mins of driving. If it's an easy fix i may go to the dealer myself

 

[Ezpotato]

Please let me know how it goes. Im just dealing with the issue because it goes away after about 20 mins of driving. If it's an easy fix i may go to the dealer myself

I will. Problem will be trying to replicate it to the dealer by the time I get there.

 

[livingSmoke]

I will. Problem will be trying to replicate it to the dealer by the time I get there.

Any update on how it went?

 

[Ezpotato]

Any update on how it went?

The service advisor was already familiar with the problem. They reset the TCM I believe and it's quite a bit better now. It's not perfect but it's definitely not embarrassing and I don't feel the jerk as much at all. I would highly recommend that they do that real quick.

 

[Snowwhite]

I think you have to short the terminals or disconnect the ECU as well for a full factory reset.

it's more complicated than that, but doable.
turn on the car, warm it a bit. trans fluid temp has to be between 95 and 200 degrees F. So it can't be from a completely cold start, but it won't have to be on very long to get to 95 degrees.

start this procedure from a standstill, car in Drive. Car must not move during the procedure and throttle position must be 0 (ie no throttle input.)

shift to N for 3 seconds. shift to D for 3 seconds. shift to N for 3 seconds. shift to R for 3 seconds. shift back to N.
wait 5 secs, shift to D, then repeat the line above 4 more times. so you do this little N-D-N-R-N dance a total of 5 times.

I did this to mine this morning, and left the car parked all day. the downshifts as I coasted down were much smoother than before I did the procedure. Cold downshifts were the worst for me.

there is another way to do it while driving, but that requires steady throttle pressure as you shift up and down through all 8 gears. who has the road to do that 5 times without everyone around you thinking you're nuts?

 

[livingSmoke]

it's more complicated than that, but doable.
turn on the car, warm it a bit. trans fluid temp has to be between 95 and 200 degrees F. So it can't be from a completely cold start, but it won't have to be on very long to get to 95 degrees.

start this procedure from a standstill, car in Drive. Car must not move during the procedure and throttle position must be 0 (ie no throttle input.)

shift to N for 3 seconds. shift to D for 3 seconds. shift to N for 3 seconds. shift to R for 3 seconds. shift back to N.
wait 5 secs, shift to D, then repeat the line above 4 more times. so you do this little N-D-N-R-N dance a total of 5 times.

I did this to mine this morning, and left the car parked all day. the downshifts as I coasted down were much smoother than before I did the procedure. Cold downshifts were the worst for me.

there is another way to do it while driving, but that requires steady throttle pressure as you shift up and down through all 8 gears. who has the road to do that 5 times without everyone around you thinking you're nuts?

Is this legit? Is there any confirmation on the dash that lets you know that it was done successfully?

 

[livingSmoke]

it's more complicated than that, but doable.
turn on the car, warm it a bit. trans fluid temp has to be between 95 and 200 degrees F. So it can't be from a completely cold start, but it won't have to be on very long to get to 95 degrees.

start this procedure from a standstill, car in Drive. Car must not move during the procedure and throttle position must be 0 (ie no throttle input.)

shift to N for 3 seconds. shift to D for 3 seconds. shift to N for 3 seconds. shift to R for 3 seconds. shift back to N.
wait 5 secs, shift to D, then repeat the line above 4 more times. so you do this little N-D-N-R-N dance a total of 5 times.

I did this to mine this morning, and left the car parked all day. the downshifts as I coasted down were much smoother than before I did the procedure. Cold downshifts were the worst for me.

there is another way to do it while driving, but that requires steady throttle pressure as you shift up and down through all 8 gears. who has the road to do that 5 times without everyone around you thinking you're nuts?

Thanks for the follow-up. Have you noticed any performance degradation in gear timings in sport mode? I remember someone somwhere saying that this was an unfortunate side effect of getting that TSB done. Thank you for sharing your experience.

 

[Ezpotato]

Thanks for the follow-up. Have you noticed any performance degradation in gear timings in sport mode? I remember someone somwhere saying that this was an unfortunate side effect of getting that TSB done. Thank you for sharing your experience.

I don't think they really did a TSB. They just reset the module to start learning driving habits again. I'm not sure how much it actually learns but all I know is the car shifts just as fast and doesn't have the hard downshifting so I'm happy

 

[Snowwhite]

Thanks for the follow-up. Have you noticed any performance degradation in gear timings in sport mode? I remember someone somwhere saying that this was an unfortunate side effect of getting that TSB done. Thank you for sharing your experience.

this isn't a TSB, this is the instructions for the reset from the service manual. the TSB involves uploading new firmware to the module, which can't be done other than at a dealer. my car is newer than that TSB, so I probably already have the newer firmware in my control module.

 

[Snowwhite]

start this procedure from a standstill, car in Drive. Car must not move during the procedure and throttle position must be 0 (ie no throttle input.)

shift to N for 3 seconds. shift to D for 3 seconds. shift to N for 3 seconds. shift to R for 3 seconds. shift back to N.
wait 5 secs, shift to D, then repeat the line above 4 more times. so you do this little N-D-N-R-N dance a total of 5 times.

Edit to this- the first time i did this the results were short-lived. I did it again, but without the extra shift to D, and with the trans a good bit warmer. That was a week ago, and it hasn't come back. the translations in the service manual leave a little bit to be desired.

so start in D (once.) then do the N-D-N-R-N and repeat, so
N-D-N-R-N-D-N-R-N-D-N-R-N-D-N-R-N-D-N-R-N with 3 seconds at each position.

 

[nhcowboy28]

↑↑↓↓←→←→BA select start

 

[Snowwhite]

↑↑↓↓←→←→BA select start

if you're old enough, the scene from Galaxy Quest with the chompers would be fitting here...

 

[BlaydeX15]

Is there any feedback when you successfully complete the process? Like a beep or something?

 

[Snowwhite]

Is there any feedback when you successfully complete the process? Like a beep or something?

nope. I just felt smoother shifts after that.

 

[G-337417]

I've noticed this becoming increasingly more lately, if I'm slowing down slowly and applying moderate pressure to the break sometimes the downshifts in sport mode just feel pretty hard and jerky at times, slowing the car down themselves.

If I stop alot faster then there is no issue as the downshifts don't slow the car down as much due to the quicker stopping. I understand the downshifts are going down quicker to give the car more functionality for starting and stopping much faster, but I like cruising around in sport mode and I'm just worried the downshifts feel so forcefull it's hard on the transmission, over time may become a problem??

Anyone else concerned over this.

The lower the gear, the slower you should be going. The engine will hold you back if you are not at the proper speed for that particular gear...

If you are on the highway going 65 mph, you should be in 6th gear. If you must make an immediate stop, these are the proper procedures...

Brake to slow your speed. Get the RPM's down, then down shift to 5th gear, which should be around 55 mph.

You must pay attention to the rpms and speed of the vehicle before downshifting. If you shift from 5th to 1st gear without slowing down, you will ruin your engine! It'll bog down and give you that grinding noise.

Its all about getting the right gear with the right speed/rpms.