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  #1  
Old 10-12-2016, 09:23 PM
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s27 Recall shifting

Had the s27 auto park recall done and now the auto transmission shifting sucks compared to what it used to be like. Has anyone had shifting issues after doing auto park recall? Engine revs much higher from stop sign before shifting into 2nd. Also driving down the highway at 60mph I let off the gas for a second and then went to push the pedal down slightly and felt a bump/jerk in the transmission. Never experienced this before the recall was performed. Can I reset the transmission by unplugging the battery for some time and try letting it relearn my driving again? Thanks.

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Old 10-13-2016, 09:04 AM
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Re: s27 Recall shifting

I know this doesn't help you, but I have constantly have had a terrible 3-2 shift. And then driving up a ramp in a parking garage - it takes forever to shift to 2 when I get to flat ground. It's like "come on, go to the next gear. you can do it".

Been to a dealer 4 different times, but all different dealers (I have been moving around so it hasn't been the same one).

I'm going back to the same one on Monday. I told them if they don't think there is a problem, if they think the transmission is perfect, then put me in a 2017 and I will pay the difference for wear and tear etc. Otherwise, fix the damn problem.
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  #3  
Old 10-13-2016, 09:37 AM
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Re: s27 Recall shifting

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Originally Posted by hillmanj08 View Post
I know this doesn't help you, but I have constantly have had a terrible 3-2 shift. And then driving up a ramp in a parking garage - it takes forever to shift to 2 when I get to flat ground. It's like "come on, go to the next gear. you can do it".

Been to a dealer 4 different times, but all different dealers (I have been moving around so it hasn't been the same one).

I'm going back to the same one on Monday. I told them if they don't think there is a problem, if they think the transmission is perfect, then put me in a 2017 and I will pay the difference for wear and tear etc. Otherwise, fix the damn problem.
Thanks for the info, but mine never had a problem until they performed the s27 auto park recall. Ain't broke, don't fix it? Well now mine feels broke. They wouldn't do any other repairs until I ok'd the recall be performed. Nice.
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Old 10-13-2016, 03:46 PM
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Re: s27 Recall shifting

If they cleared the memory the program that is there is the default one until it gets used to your driving style.
I don't think the default program was that bad so I suspect you do have a shifting issue.
I am hesitant to take mine in because I have zero issues with mine at 44K miles....
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Old 10-13-2016, 08:12 PM
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Re: s27 Recall shifting

Did some more test driving and also unplugged battery for 30+ minutes and pressed brake pedal to drain off any voltage. The biggest concern is the hard shift before the transmission drops into 7th from 8th. I can make this happen going down a hill and when the truck starts back up the other side of the hill before it even shifts down from 8th it jerks the entire Jeep like it's struggling to shift down into 7th. Never before has this ever happened. Is there any tsb for this hard shifting at highway speeds?
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Old 10-13-2016, 08:17 PM
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Re: s27 Recall shifting

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Originally Posted by chadg2 View Post
Is there any tsb for this hard shifting at highway speeds?
Maybe.

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Old 10-14-2016, 10:55 AM
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Re: s27 Recall shifting

Quote:
Originally Posted by chadg2 View Post
Did some more test driving and also unplugged battery for 30+ minutes and pressed brake pedal to drain off any voltage. The biggest concern is the hard shift before the transmission drops into 7th from 8th. I can make this happen going down a hill and when the truck starts back up the other side of the hill before it even shifts down from 8th it jerks the entire Jeep like it's struggling to shift down into 7th. Never before has this ever happened. Is there any tsb for this hard shifting at highway speeds?

Update:

Took the vehicle out on a second test drive today. Drove it like I stole it without any cruise control and no babying at all. The result was not a single hiccup at over 50 miles of being aggressive with the Jeep and had no shifting issues with the transmission. Go figure?
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Old 10-29-2016, 10:47 AM
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Re: s27 Recall shifting

I have a 2016 Grand Cherokee diesel that did not need the shifter recall. The upshifts are silky smooth and the downshifts are proper for speed and load EXCEPT 3 -> 2.

When I slow down approaching a roundabout, the transmissions stays in 3rd all the way down to 7 - 8 mph. Then when I ease on the accelerator, the transmission drops into 1 or 2 (I do not have the time to note), and unless I'm careful, the engine revs way up and the vehicle lurches forward.

My solution is to coax the transmission into 2nd hoping that I do not need a faster than normal increase in speed -- then it feels like I put the spurs into a quarter horse.

Can a dealer fix this? Is this normal? Anyone else have this problem?

RT Cary
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Old 10-29-2016, 11:16 AM
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Re: s27 Recall shifting

Quote:
Originally Posted by rtcary View Post
I have a 2016 Grand Cherokee diesel that did not need the shifter recall. The upshifts are silky smooth and the downshifts are proper for speed and load EXCEPT 3 -> 2.

When I slow down approaching a roundabout, the transmissions stays in 3rd all the way down to 7 - 8 mph. Then when I ease on the accelerator, the transmission drops into 1 or 2 (I do not have the time to note), and unless I'm careful, the engine revs way up and the vehicle lurches forward.

My solution is to coax the transmission into 2nd hoping that I do not need a faster than normal increase in speed -- then it feels like I put the spurs into a quarter horse.

Can a dealer fix this? Is this normal? Anyone else have this problem?

RT Cary
Yes I'm having the same exact problem with 3>2 downshift after s27 recall
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Old 10-29-2016, 11:56 AM
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Re: s27 Recall shifting

Quote:
Originally Posted by rtcary View Post
I have a 2016 Grand Cherokee diesel that did not need the shifter recall. The upshifts are silky smooth and the downshifts are proper for speed and load EXCEPT 3 -> 2.



When I slow down approaching a roundabout, the transmissions stays in 3rd all the way down to 7 - 8 mph. Then when I ease on the accelerator, the transmission drops into 1 or 2 (I do not have the time to note), and unless I'm careful, the engine revs way up and the vehicle lurches forward.



My solution is to coax the transmission into 2nd hoping that I do not need a faster than normal increase in speed -- then it feels like I put the spurs into a quarter horse.



Can a dealer fix this? Is this normal? Anyone else have this problem?



RT Cary

You don't have to "coax" it. You can shift it. You know, with the paddle shifters, or the slap shift.


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Old 10-29-2016, 12:00 PM
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Re: s27 Recall shifting

I tried that once as I was entering the roundabout to find that upshifting with a turning steering wheel was next to impossible -- as the vehicle was picking up speed. Not my choice again.

\rtc
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Old 11-05-2016, 04:15 PM
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Re: s27 Recall shifting

I had the Recall TCM update performed a few days ago and I must say the car drives much better than it did before the update. Prior to the update I had some odd shifting going on for quite a while. The dealer checked things out but said nothing was wrong. Regardless, the car had some jerking shifts between 2-3 going up and down in speed.

After the update it drives like a different car. Much smoother on up and down shifts and the tranny shifts when it should not before or after. This is on with Eco Off.

According to my paperwork from the dealer the recall included all of the following updates:
PCM from AA to AC
TCM from AE to AF
TCM from AC to AD
RFH from AC to AD
TPC from AE to BE

Time will tell I guess but I can't even tell the update did anything other than a warking bell and notice on the Instrument Panel.
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