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Old 08-04-2016, 04:54 PM
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Shutter/Jitter While Jeep is Cold and Stopped

Need your help. Looking for thoughts, suggestions, or any insight.

Own a 2014 Jeep Grand Cherokee (Overland) w/ the ecodiesel. I've had it for just over 2 years (25 months to be exact) and just under 39k miles on it. For the most part we haven't had any issues w/ our jeep. However for the past couple of days it has been acting up.

I live in Houston. Last Friday, the family made a trip up to NW New Mexico to visit Family. My wife and son are staying up there for a couple of weeks (they have the jeep). On Monday morning (after sitting overnight) we went to run an errand. Jeep started up ok and drove down the road and got to a light. While stopped at the light (just foot on the brake), the jeep started to shutter, jitter, or as my wife calls it "jiggles". Felt like something was trying to push the jeep from behind. Enough movement of the jeep that my wife (in the passenger seat) turned to me and asked what that was. Light turned green, we made it to our destination (we didn't stop again), and after that we didn't feel it again, at least for the rest of the day. I figured it was an anomaly, forgot about it, and flew back home for work. Well talking to my wife today, it sounds like the jeep has done the exact same thing for past couple of days. Every time, its been after the jeep has sat over night. After driving around for a bit, it goes away. Never had or seen anything like this before the last couple of days. Jeep has NOT had the recent warranty flashes preformed (for the shifter).

Seems how we are only seeing it after setting over night, I am thinking being cold has something to do with it. Don't know if elevation (going from sea level to 4600') has anything to do with it?

Anyone got any thoughts on how to go about trouble shooting?

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Old 08-05-2016, 11:21 PM
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Re: Shutter/Jitter While Jeep is Cold and Stopped

I have been having similar problems. Does it feel like you are being rear ended slightly. Like a little tap? Especially when the Trans down shifts from 2-1st gear? I have been to the dealer about 11 times for this over 70k miles. FCA is going to be buying it back from me according to the lawyer. Good luck. All jeep is going to do is update your tcm and hope it doesn't come back.
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Old 08-06-2016, 06:51 AM
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Re: Shutter/Jitter While Jeep is Cold and Stopped

That's exactly what it feels like. I can't comment if it's when the tranny shifts down from 2-1 (I was only in the vehicle the 1st time it did it and haven't been around since). Timing seems about right though, it starts right as you are coming to the full stop and then will continue while your stop.

I will have to have my wife verify if that's when it's occurring.

Thanks.
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Old 08-06-2016, 08:35 AM
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Originally Posted by dom42 View Post
I have been having similar problems. Does it feel like you are being rear ended slightly. Like a little tap? Especially when the Trans down shifts from 2-1st gear? I have been to the dealer about 11 times for this over 70k miles.
I had this quite badly in summer of 2014. It literally felt like being rear-ended every time I came to a stop. A TCM flash fixed it then. It came back in a much milder form about two months ago (this time felt like jostling/shuddering downshifting from 2 to 1). Banished it by resetting the TCM/t-case by disconnecting the battery overnight. Mild form came back about a week ago. Considering taking it in rather than continuing to disconnect the battery.

Off the wall question: do either of you sometimes see "4WD Shift in Progress" messages on EVIC when you first start up your Jeeps? I've always thought it's odd my Jeep does that when most apparently do not, and this downshift thing doesn't happen with everyone either, so perhaps there's a link.

Quote:
All jeep is going to do is update your tcm and hope it doesn't come back.
...which, at this point, means that the shifter of doom recall will be applied, because the latest TCM software has the recall code bundled. Oh well, my attitude with these flashes is that I defer updates if I have no current issues ("if it ain't broke..."); this shuddering is changing my driving patterns to try to ameliorate it, so now it's worth it for me to do the flash.
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Old 08-06-2016, 08:48 AM
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Re: Shutter/Jitter While Jeep is Cold and Stopped

The trans in my 14 really slammed when it was 2-1 downshifting at a stop. It was really annoying to experience that when stuck in crawling, bumper to bumper traffic. Luckily for me the adaptive relearn fixed that and I never had to go the valve body / trans replacement route.

On my 16 HA, the trans stays in 2nd until I'm fully stopped, then a second or so later it'll go down to 1st. That's so much nicer and the way they all should've been programmed to operate.
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Old 08-06-2016, 09:12 AM
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Re: Shutter/Jitter While Jeep is Cold and Stopped

Quote:
Originally Posted by MDBones View Post
The trans in my 14 really slammed when it was 2-1 downshifting at a stop. It was really annoying to experience that when stuck in crawling, bumper to bumper traffic. Luckily for me the adaptive relearn fixed that and I never had to go the valve body / trans replacement route.

On my 16 HA, the trans stays in 2nd until I'm fully stopped, then a second or so later it'll go down to 1st. That's so much nicer and the way they all should've been programmed to operate.


Mine kind of does the same thing now and the bump is not a dramatic if it does happen. But still annoying. It's going in again real soon. But sometimes when's come to a stop , my Trans will feel like it's stuck in 2nd gear after I have completely stopped. The gear I doctor says first but I swear it's 2nd gear. And no it's not the turbo lag.
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Old 08-06-2016, 09:14 AM
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Re: Shutter/Jitter While Jeep is Cold and Stopped

Quote:
Originally Posted by Roadkill View Post
I had this quite badly in summer of 2014. It literally felt like being rear-ended every time I came to a stop. A TCM flash fixed it then. It came back in a much milder form about two months ago (this time felt like jostling/shuddering downshifting from 2 to 1). Banished it by resetting the TCM/t-case by disconnecting the battery overnight. Mild form came back about a week ago. Considering taking it in rather than continuing to disconnect the battery.

Off the wall question: do either of you sometimes see "4WD Shift in Progress" messages on EVIC when you first start up your Jeeps? I've always thought it's odd my Jeep does that when most apparently do not, and this downshift thing doesn't happen with everyone either, so perhaps there's a link.


...which, at this point, means that the shifter of doom recall will be applied, because the latest TCM software has the recall code bundled. Oh well, my attitude with these flashes is that I defer updates if I have no current issues ("if it ain't broke..."); this shuddering is changing my driving patterns to try to ameliorate it, so now it's worth it for me to do the flash.


I have never seen a 4x4 shift in progress message in this jeep.

I'm honestly going to get rid of this jeep and try the 2017 Benz GLS 350 bluetec or the 550. Can't afford the gls63 lol. I wish.
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Old 08-06-2016, 03:24 PM
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Re: Shutter/Jitter While Jeep is Cold and Stopped

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Originally Posted by MDBones View Post
Luckily for me the adaptive relearn fixed that
As far as I know, the disconnected battery accomplishes the adaptive relearn. All the TSBs have warnings about not letting the system voltage drop in order to *avoid* triggering a relearn, as apparently the relearn can cause "rough" shifting.

The irony is that the "relearning" transmission shifts wonderfully & smoothly and it's only later, after it has "learned", that it becomes rough & generally bad at life. I just don't want to pull the fuse or disconnect the battery on a daily or weekly basis.
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Old 08-06-2016, 04:15 PM
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Re: Shutter/Jitter While Jeep is Cold and Stopped

I've literally have had my Trans reset about a dozen times and it always will pop back up.
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Old 08-06-2016, 04:43 PM
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Originally Posted by dom42 View Post
I've literally have had my Trans reset about a dozen times and it always will pop back up.
Yep. Resetting/relearning is only a temporary fix when "learning" means "learning to operate badly".

Have you tried driving around in Snow Mode to see what happens? That should completely eliminate the 2 to 1 shift, because Snow Mode starts in 2 for torque control. Not that anyone should be forced to resort to this, but more for the experimental aspect.
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Old 08-06-2016, 05:22 PM
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Re: Shutter/Jitter While Jeep is Cold and Stopped

Quote:
Originally Posted by Roadkill View Post
As far as I know, the disconnected battery accomplishes the adaptive relearn. All the TSBs have warnings about not letting the system voltage drop in order to *avoid* triggering a relearn, as apparently the relearn can cause "rough" shifting.

The irony is that the "relearning" transmission shifts wonderfully & smoothly and it's only later, after it has "learned", that it becomes rough & generally bad at life. I just don't want to pull the fuse or disconnect the battery on a daily or weekly basis.

That voltage drop warning is common language found in a TSB for any module software update while it's being applied, not just the TCM. That is more for preventing software install failure than anything else.

You may be right but my belief is that the adaptive relearn does a little more than what simply disconnecting the battery would do.

People should also be aware that an adaptive relearn may not instantly fix the problem and it may require putting a few hundred miles on before you'll notice a difference. That was my experience with having it done. I had both harsh up and downshifts. It instantly fixed the harsh upshift but it took 350-400 miles of driving before the harsh 2-1 downshift simply disappeared. Neither problem ever returned after that. Like I said earlier, maybe I was just one of the lucky ones.
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Old 08-06-2016, 06:05 PM
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Originally Posted by MDBones View Post
You may be right but my belief is that the adaptive relearn does a little more than what simply disconnecting the battery would do.
That is a definite possibility, though clearly a battery disconnect does immediately affect the transmission shifting, with the effects lasting for days to years depending on the vagaries of the individual Jeep. I'd definitely let the dealer nuke my TCM profile and force the relearn at this point, but my results will be confounded by the fact that they will reflash the TCM at the same time due to the recall. I'll probably ask them to force the relearn regardless.

Quote:
People should also be aware that an adaptive relearn may not instantly fix the problem and it may require putting a few hundred miles on before you'll notice a difference. That was my experience with having it done. I had both harsh up and downshifts. It instantly fixed the harsh upshift but it took 350-400 miles of driving before the harsh 2-1 downshift simply disappeared.
Interesting. My initial downshift problem was fixed by TCM flash, which lasted ~25k miles. My recent downshift problem was instantly fixed by battery disconnect and didn't recur until after I drove for approximately 1k miles. The subsequent disconnect suppressed the problem for about 300 miles. I'm not impressed by the pattern here (haha).

Quote:
Neither problem ever returned after that. Like I said earlier, maybe I was just one of the lucky ones.
Fingers crossed.
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