2012 Wrangler Auto transmission shift problems? - Page 2 - Jeep Wrangler Forum

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Old 08-03-2012, 02:24 PM   #31
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You guys are all forgetting that these things change depending on how you drive them. Two Jeeps that have had 2 very different driving styles used in them are going to drive distinctly different from each other. You want less lugging? Drive it like you stole it and it should go away after a while.

The problem is, I don't want mine to lug, nor do I want to drive it like I stole it. A happy medium would be nice but it doesn't really seem very achievable, at least not for very long.

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Old 09-22-2012, 06:39 PM   #32
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I have the same problem. DO people experiencing this have the 3.21 or 3.73 gear ratio ?

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Old 09-22-2012, 06:45 PM   #33
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I have 3.21 gears and mine lugs. Like others who have posted in this thread, if I shift manually, it doesn't lug and my gas mileage is slightly better.
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Old 09-22-2012, 08:26 PM   #34
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yeah but do people with 3.73 experiencing this ?
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Old 09-22-2012, 09:49 PM   #35
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I have a 12 JKU with 5 auto, 35 tires and a lift. Mine does not lug. I have a 373 rear end.
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Old 10-26-2012, 03:19 PM   #36
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I have a 2013 JKR 4.10 rear and have been experiencing it since about 500 miles, have 2500 on it now. I can feel the "fishbite," and the lug, and can feel it shift down hard whenever I hit the break, way more than what I should feel and never felt it with any other jeeps I've driven (WJ, XJ, KJ, KK, TJ, and a WK2 with the same engine and transmission). I was always under the impression that the 4.10s were supposed to make it peppier off the line, not hesitate as I'm pulling into an intersection. Definitely annoying and definitely shouldn't be "because it's a wrangler!"
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Old 02-11-2013, 09:59 AM   #37
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We have 2 Wranglers; both are 2012 models with auto-transmission. The Sahara 4-door has 3:21 gears and the Rubicon 2-door has 4:10 gears. Currently the Sahara has ~5K miles and the Rubicon has ~7K miles.

Both Wranglers have transmission issues. The most annoying issue is the slow-to-engage from a stop problem. This problem is intermittent. We never know when the car isn’t going to engage as expected. Every now-and-then when we attempt to ease into acceleration, it feels like the transmission isn’t engaging. When this happens, we press harder on the accelerator so the engine revs increase, and then it grabs and engages.

For whatever the reason, this problem is worse in the Sahara than the Rubicon.

We didn’t notice this problem in either vehicle until about 3000 miles. Then it slowly became more apparent.

Neither my wife nor I want to use manual-shift for our daily driving, which is why we purchased Wranglers with auto-transmissions.

We have not reported this to the dealer yet, but we are planning too. I really hope this is a problem that can be solved.
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Old 02-11-2013, 10:39 AM   #38
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Manual shifting is the way to go. It works great and like others have said, it can increase your MPG
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Old 05-28-2013, 12:36 PM   #39
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Similar Tranny Slip Issue

Just picked up a used '12 with 15K on it. It has a noticeable slip when going easy on the throttle shifting into 3rd (?) at about 40 or 45mph. The transmission actually completely disengages for a second and the jeep freewheels. Strange though, the engine doesn't rev out. It re-engages in the next (proper) gear and shows ECO mode at that point. Makes me think a programming glitch ?? I want to make sure I can replicate the issue consistently before bringing in after a few days of driving.
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Old 08-17-2015, 03:08 PM   #40
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I also have a 2013 JKU that has the same stupid rpm drop/lag from second to 3rd. nothing seems to fix it. Dealer says nothing is wrong with it. I'm posting in hopes of reviving this discussion. It is just irritating as heck. I can't even remember when it started. I can't remember when it wasn't doing it. I'm sure it didn't or not as much when it was new.
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Old 08-17-2015, 03:30 PM   #41
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I just purchased a 2012 jku Sahara with 76k miles on it. I also noticed the shifting lag. I tried the computer reset thing and it seemed to help it. Although I have to do it every so often. Both the dealership and a non partial mechanic I know said everything is fine with it. That the lag is normal, just the way these jeeps shift sometimes. Again I'm a newbie to the jeep world but have been looking into this same issue. So in the end I'm not to worried about other then it being an annoyance
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Old 08-17-2015, 05:37 PM   #42
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I've noticed my 15 doesn't want to up shift at times. I simply do it manually with the auto-stick. I've also noticed it aggressively down shifts when going up hills at times. Will drop from 5th to 3rd, when 4th would be fine. Again, I shift up from 3rd to 4th, then back to D when cresting the hill.

Jeep thing I guess.
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Old 08-19-2015, 07:47 AM   #43
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Noplac2hyd, How are you resetting your computer and do you use anything like a procal or superchips tuner on your JK?
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Old 08-20-2015, 02:08 AM   #44
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I have nothing extra installed. I've only had it for 3 weeks now and the down payment wiped me out. Ha. As far as the reset. I saw it posted in a thread somewhere on here. Basically

Turn your car to the "on" position (I believe 2 clicks) not starting the engine

All the lights on the dash will go crazy for a few second then settle once they settle slowly (very slowly) push the gas pedal as far down as it can go then at the same slow slow speed bring it back up

Then turn the car off, then start it like normal this supposedly resets something. Some say it's a placebo effect. But it seemed to work for me
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Old 08-20-2015, 11:01 AM   #45
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I will have to give it a try, sounds like it is resetting the TPS sensor.

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