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  #25  
Old 06-22-2015, 10:20 AM
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Re: 2015 JGC 8-Speed Transmission Issues

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Originally Posted by jeepster23 View Post
How would you know what others are expieriencing?
Deductive reasoning. Several post's on here of folks bitching about how the transmission operates and the "issues" they describe are how the transmission was designed to function.

To many preconceived notions.

Perfect example

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Originally Posted by Eugene The Jeep View Post
I don't think my sport mode even functions properly. All that it seems to do is hold the gear for an unusually long period of time. So RPMs will be high, but there isn't an upshift where and when you'd expect it. Just love that my $42k car drives like its being operated by someone learning stick shift for the first time.

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  #26  
Old 06-22-2015, 10:51 AM
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Re: 2015 JGC 8-Speed Transmission Issues

I have two identical Jeeps, purchased two weeks apart. One drives flawlessly, the other does not. Now, as of yesterday, it lurches as it downshifts. The first time it happened, I thought someone tapped me from behind. Preconceived notions?


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  #27  
Old 06-22-2015, 12:30 PM
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Re: 2015 JGC 8-Speed Transmission Issues

I'm sure....
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  #28  
Old 06-22-2015, 03:00 PM
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Re: 2015 JGC 8-Speed Transmission Issues

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Originally Posted by Benn0 View Post
Well that is what Sport mode does, so it sounds like its working. By holding higher revs it is accessing more power. It also reduces traction control, and pushes more power to the rear wheels.

The torque converter introduces a bit of lag, particularly at take off, and particularly when its cold. It just takes a while to bind up when its cold.

I haven't met a perfect auto trans that shifts when I would expect it to shift. Its always more noticable at low speeds when you are trying to build momentum, more so than at higher speeds when momentum is already there. My old landcruiser would always pick the wrong gear at a certain speed on a certain corner just down from my house. Drove me nuts.

Interesting that your wifes car doesn't have the same characteristics as your car. I guess it could be the learning, you could ask the dealer to reset it to relearn.

There's a bit of info in this TSB:
http://www.wk2jeeps.com/tsb/tsb_wk2_2101214b.pdf
My MY15 shifts when I expect it would. So did the Jeep (MY14) Prior and the Jeep (MY02) Before that. Very predictable, very smooth.

However, when I first got the MY14 it was mess for 5 months or so until they resolved it with a flash. It was immediately right the moment I pulled out of the shop. No relearning needed.
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  #29  
Old 06-23-2015, 12:31 AM
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Re: 2015 JGC 8-Speed Transmission Issues

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Originally Posted by mswlogo View Post
My MY15 shifts when I expect it would. So did the Jeep (MY14) Prior and the Jeep (MY02) Before that. Very predictable, very smooth.

However, when I first got the MY14 it was mess for 5 months or so until they resolved it with a flash. It was immediately right the moment I pulled out of the shop. No relearning needed.
Yeah, I wasn't talking about smoothness, I was talking about upshift and downshift points. They aren't always where you would like them, they may be predictable and smooth, but that's another story. The OP was saying the upshift is late in sport mode, that is normal. The Op also seems to be more concerned about shiftpoints than smoothness in ECO mode. So I'm not sure he is experiencing your typical trans roughness issue.

How do you know the mechanic didn't perform a re-learn on your trans when it was flashed? If the memory cells were cleared and the relearn procedure not followed correctly you can experience rough changes until the cells are cleared again and the relearn performed correctly. The process is detailed here:
http://www.wk2jeeps.com/tsb/tsb_wk2_2101214b.pdf
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Old 06-23-2015, 01:06 AM
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Re: 2015 JGC 8-Speed Transmission Issues

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Originally Posted by Benn0 View Post
Yeah, I wasn't talking about smoothness, I was talking about upshift and downshift points. They aren't always where you would like them, they may be predictable and smooth, but that's another story. The OP was saying the upshift is late in sport mode, that is normal. The Op also seems to be more concerned about shiftpoints than smoothness in ECO mode. So I'm not sure he is experiencing your typical trans roughness issue.

How do you know the mechanic didn't perform a re-learn on your trans when it was flashed? If the memory cells were cleared and the relearn procedure not followed correctly you can experience rough changes until the cells are cleared again and the relearn performed correctly. The process is detailed here:
http://www.wk2jeeps.com/tsb/tsb_wk2_2101214b.pdf
Because it takes time to learn and it felt perfect the day I drove out of the dealer and the last TSB I had done said explicitly not to reset it.

Smooth is where I would "expect it". Not to late, not to early. If I step on it, it goes later. Just where I would expect it to be. I don't want it sooner or later, because it wouldn't be as smooth.

If you have a good one, it's about as close to perfection there is.
I'm a big fan of Manual Transmissions. But after having this I don't care as much as having a Manual around any more.
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  #31  
Old 06-23-2015, 02:30 AM
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Re: 2015 JGC 8-Speed Transmission Issues

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Originally Posted by mswlogo View Post
Because it takes time to learn and it felt perfect the day I drove out of the dealer and the last TSB I had done said explicitly not to reset it.

Smooth is where I would "expect it". Not to late, not to early. If I step on it, it goes later. Just where I would expect it to be. I don't want it sooner or later, because it wouldn't be as smooth.

If you have a good one, it's about as close to perfection there is.
I'm a big fan of Manual Transmissions. But after having this I don't care as much as having a Manual around any more.
Ok, we are talking about different things then, rough gear changes are when there is a jerking feeling on the change, not when it changes at a lower or higher shift point.

Read the TSB I linked, the relearn procedure is done in 1.4 hours.
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  #32  
Old 06-23-2015, 12:30 PM
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Re: 2015 JGC 8-Speed Transmission Issues

I know this is a controversial topic on this forum, so I'm really sorry if I drew anyone's ire. My Jeep is at the shop now. Let's see what happens.

My chief complaint was delayed upshift, 1-2 and 2-3, most noticeable after car has been parked and most severe in am.

The secondary problem is a very noticeable "drag down" feeling when the car downshifts in deceleration. There is a "pull" from 5-4, 4-3, etc.

As I told the service manager, if this is the way it is, then this is the way it is. I just want to make sure there isn't something more at play here.

Again, I am spoiled by my wife's 2015. He car literally "glides" through the shifting, both up and down. And there is no dragging, lagging, etc.

According to the service manager, my disconnecting the battery did delete the transmission data, but what is does not do is reprogram the "relearn" routine. I guess that means it defaults to factory parameters.
Who knows? However, when I did have it flashed with the relearn five weeks ago, the great results were short lived.

I'm resigned to change the way I think about my car. Perhaps I need to stop expecting to "enjoy the ride" and just expect it to get me from A to B and back again.




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  #33  
Old 06-23-2015, 07:21 PM
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Re: 2015 JGC 8-Speed Transmission Issues

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Originally Posted by Eugene The Jeep View Post
Again, I am spoiled by my wife's 2015. He car literally "glides" through the shifting, both up and down. And there is no dragging, lagging, etc.

According to the service manager, my disconnecting the battery did delete the transmission data, but what is does not do is reprogram the "relearn" routine. I guess that means it defaults to factory parameters.
Who knows? However, when I did have it flashed with the relearn five weeks ago, the great results were short lived.
Well you have the benefit there of being able to compare 2 cars (I'm guessing they are similar build dates too?). So your experience is somewhat objective. It's a bit difficult for the service guys to argue 'that's just how it is' when you have another car that is behaving differently. Keep on their case, as I said before, the re-learn procedure is a bit complicated, if they don't do it right it won't store the correct change parameters. Perhaps they need to do it again. Either way, I'd keep on them about it, it sounds like there is a problem somewhere.

I get lag in the morning, when the car is relatively cold. But its mainly from stop into 1st. The torque conveter seems to take longer to engage. Once its warm its all smooth. Rest of my shifts are smooth. But I have a diesel, so the trans is a different version to yours.
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  #34  
Old 06-23-2015, 08:35 PM
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Re: 2015 JGC 8-Speed Transmission Issues

Heard back from service. They were able to duplicate the problem, so I have that going for me. As for a fix? They opened up a case with Chrysler Engineering and are waiting to hear back. The saga continues...


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  #35  
Old 06-24-2015, 12:59 AM
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Re: 2015 JGC 8-Speed Transmission Issues

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Originally Posted by Eugene The Jeep View Post
Heard back from service. They were able to duplicate the problem, so I have that going for me. As for a fix? They opened up a case with Chrysler Engineering and are waiting to hear back. The saga continues...


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That's half the battle good luck.

Keep in mind that the transmission does some downshift braking.

As soon as you touch the brake it may downshift and use the engine to help slow the vehicle.
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  #36  
Old 06-24-2015, 03:21 AM
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Re: 2015 JGC 8-Speed Transmission Issues

Hey, maybe get them to erase the learnt (bad) habits and get your wife to teach it some manners !!!

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