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  #1  
Old 01-28-2016, 06:41 PM
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Shifts still stuttering after tranny update

I had the tranny update for the shifting applied a while back, and it helped immensely. However, I have given it a couple of months and I am still feeling the jerk whenever it is shifting down from 3-2-1.

It is definitely not as harsh as it used to be. And maybe only happens half the time, whereas before I almost traded the jeep in because it was happening at every stop.

Any ideas? Could it be related to the heads? Doubtful though...

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Old 01-28-2016, 07:11 PM
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Re: Shifts still stuttering after tranny update

What year is your GC and what engine do you have?

If it helps...

I had the harsh 2-1 downshift and 2-3 upshift a while back on my 14 V6 gas. The dealer did the adaptive relearn procedure. That immediately took care of the harsh upshift. The harsh downshift remained for a good 350-400 miles of driving until one day it completely disappeared. Haven't had a harsh shift problem in over 10K miles of driving.

It does take time for the trans to completely relearn after one of these.

If software updates or a relearn doesn't solve it the next steps the dealer will take is to replace the trans valve body followed by replacing the trans.

People on this forum have had varying degrees of success with any of these steps. There really is no one procedure that you can point to and say, that did it!
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Old 01-28-2016, 08:03 PM
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Re: Shifts still stuttering after tranny update

2014 diesel.

I talked to my dealer about it and they've done a bunch of tranny and head replacements.

Guess I'll give them a call and take it in.
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Old 01-28-2016, 08:06 PM
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Re: Shifts still stuttering after tranny update

Interesting. Most of the complaints come on the 2014 V6 gas with its lighter duty trans.
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Old 01-28-2016, 08:40 PM
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When was the last time you had it in? They have released some powertrain and transmission updates for the diesel over the last few months so maybe these more recent flashes can help you if you have not had them.
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Old 01-28-2016, 09:02 PM
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As much as I hesitate to suggest this due to the risk of propagating "witch doctor" type superstition, in your case I'd recommend disconnecting the battery overnight as an experiment.

In the past there have been maladaptive learning patterns exhbited by the TCM for the 8HP70. Later TCM flashes have ameliorated the problem for most owners, but in the past some owners found temporary relief by resetting the TCM this way.

I really don't want to start a meme that resetting the TCM is something people should do superstitiously; however, in your case, if we are attempting to differentiate between hardware problems in the transmission itself vs poor control by the TCM, this is an experiment you can conduct at home on your own. Try it and see if your specific problem is temporarily reduced: if so, it's likely the TCM that's screwing with you rather than the transmission.
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Old 01-28-2016, 10:03 PM
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Re: Shifts still stuttering after tranny update

I had it in last month. They did the newest power train flash and I swear my mpg went down. But could also be the diesel here in Denver winter.

I did the battery thing this past summer before I did the first tranny update. Actually forgot about that.

Going to try it again. If that doesn't help, then I'll be taking it in.
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Old 01-28-2016, 10:26 PM
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Re: Shifts still stuttering after tranny update

yeah I agree with the battery cable rest, leave it off all night. I do remember reading on here somewhere that leaving it off 10 hours or something like that reset the trans vs just leaving it off a short time just reset the other systems. good luck
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