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Old 04-17-2012, 08:58 AM   #1
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2012 Wrangler Auto transmission shift problems?

I've just bought brand new 2012 Wrangler and drove the Jeep little more than 800 miles in three weeks.

I've been experiencing accelerating problem from about 40 mph on. When I attempt to ease in to an acceleration, my Jeep doesn't want to accelerate until I depress the accelerator hard. Consequently, the transmission down shifts hard and the car accelerates hard. I didn't want to hard accelerate at all, but I was often force to hard accelerate because of this problem.

I've taken back the Wrangler to the dealer twice already and the dealer told me that they've flash the transmission with updated transmission software but the problem persists. The dealer eventually told me that there is no problem with my Wrangler and this is the way the new Wrangler performs.

I can't believe this is the way the 2012 Wranglers should perform; if so, there is a major flaw with engineering of this vehicle. Rather, I'm thinking that either the engine may not be outputting full power or the transmission still may not be shifting correctly.

I've owned Wranglers previously but this is first auto transmission. I only got the auto transmission so that my wife can drive my Jeep time to time - I'm regretting it already.

Is there anyone else experiencing this type of problem or have possible solutions?

Would appreciate input from you experts.

Thanks!

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Old 04-17-2012, 09:08 AM   #2
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Mine shifts fine, since your a hands on guy you might want to try the
manual mode,

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Old 04-17-2012, 09:11 AM   #3
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another jeep dealer

hi, i would take it to another jeep dealer, i had a problem like
yours (not on my present 2012 jeep) and the second dealer was able
to fix the problem. Your service is covered at any dealer, also ask to
test drive another jeep to get the feel of what is normal.hope u can get it resolved soon!
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Old 04-17-2012, 09:25 AM   #4
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Quote:
Originally Posted by firehawk
hi, i would take it to another jeep dealer, i had a problem like
yours (not on my present 2012 jeep) and the second dealer was able
to fix the problem. Your service is covered at any dealer, also ask to
test drive another jeep to get the feel of what is normal.hope u can get it resolved soon!
Do you know what they did to fix your trans?

I have a similar behavior but just assumed it was throttle lag. From time to time I reset the throttle to make it more responsive.
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Old 04-17-2012, 09:31 AM   #5
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Do you have 3.21 gearing? Might be a cause
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Old 04-17-2012, 10:17 AM   #6
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I just made an appointment with another dealer. I Will follow up with the details.
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Old 07-10-2012, 10:20 AM   #7
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I Will follow up with the details.
I have simalar problem and was wondering if you have the follow up

Akash
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Old 07-10-2012, 10:32 AM   #8
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I have the same problem. I just choked it up to Jeep trying to save MPG, but if you have any update/suggestions or ideas on to to make it so that when I push on the pedal it goes, let me know.
Thanks.
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Old 07-10-2012, 11:17 AM   #9
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Can you find a similar jeep to test drive? Where are you located?
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Old 07-10-2012, 11:35 AM   #10
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The dealer is correct. This is the way the transmission in the Wrangler performs. It loves to lug and doesn't downshift as fast as you want. I was supremely annoyed with this on my Maine trip last week, as the constant up/down hills needed the tranny to work, but it mostly refused. The only cure is manual shifting. Believe it or not, the manual mode in the JK is excellent, one of the best I've used in vehicles to date. It's very quick and holds a gear. I also increased MPG by 3-4 mpg by staying at the correct power zone, allowing me to stay in "ECO" and not lug the motor.
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Old 07-10-2012, 01:43 PM   #11
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Quote:
Originally Posted by New2012JEEP View Post
Do you have 3.21 gearing? Might be a cause
My Jeep with 3.21s does exactly the same thing- though based on the gear chart a 3.73 is only about 10% different. I've seen other posts where people have complained about the same thing and have 3.73s.
As others mentioned- I thinks its just the Jeep and whow they "adjusted" for the extra gear.
Really annoying when city driving- I am just in the habit of manually shifting now.
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Old 07-10-2012, 01:49 PM   #12
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My Jeep with 3.21s does exactly the same thing- though based on the gear chart a 3.73 is only about 10% different. I've seen other posts where people have complained about the same thing and have 3.73s.
As others mentioned- I thinks its just the Jeep and whow they "adjusted" for the extra gear.
Really annoying when city driving- I am just in the habit of manually shifting now.
The gears have nothing to do with the way the transmission is programmed to shift. Jeep programmed it to keep the lowest possible RPMs, which pleases the emissions idiots but sucks for actual drivability. What we all want is for the tranny to keep a gear longer before upshifting and drop down a gear with less throttle input. Unfortunately for us, the only way to do this is to manually control the gearbox.
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Old 07-10-2012, 03:35 PM   #13
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This is what I hate most about my new Jeep.....frustrating....
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Old 07-10-2012, 03:41 PM   #14
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I can't complain at all about the shifting pattern in my auto tranny. Seems fine to me and I do lots of interstate and city driving. As mentioned above, the OP should test drive another automatic Wrangler to see if what he's experiencing is present. If not, as mentioned above, find a different service department to visit.
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Old 07-10-2012, 04:02 PM   #15
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I own a Black and a Sahara tan both 2012s and 4dr Unlimited Rubicons, my Tan one has similar shifting problems from 1st to 2nd and from 2nd to 3rd but only when its cold. My black Rubi that my wifes drives doesnt experience any of those issues now call me crazy but I see alot of people calling it normal but I own 2 identical jeeps with the same options and one does it and one does not. How do you explain that? Took them both to the dealer here in AZ and they could not give me an explanation after driving both.
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Old 07-10-2012, 04:09 PM   #16
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Quote:
Originally Posted by Jeep12
I own a Black and a Sahara tan both 2012s and 4dr Unlimited Rubicons, my Tan one has similar shifting problems from 1st to 2nd and from 2nd to 3rd but only when its cold. My black Rubi that my wifes drives doesnt experience any of those issues now call me crazy but I see alot of people calling it normal but I own 2 identical jeeps with the same options and one does it and one does not. How do you explain that? Took them both to the dealer here in AZ and they could not give me an explanation after driving both.
I wonder if this could be because of all the the computer workings and how it "learns" our driving habits over time.
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Old 07-10-2012, 04:11 PM   #17
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Quote:
Originally Posted by Jeep12 View Post
I own a Black and a Sahara tan both 2012s and 4dr Unlimited Rubicons, my Tan one has similar shifting problems from 1st to 2nd and from 2nd to 3rd but only when its cold. My black Rubi that my wifes drives doesnt experience any of those issues now call me crazy but I see alot of people calling it normal but I own 2 identical jeeps with the same options and one does it and one does not. How do you explain that? Took them both to the dealer here in AZ and they could not give me an explanation after driving both.
Interesting. Glad I have a black Rubi as well....it must be related to paint color then
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Old 07-10-2012, 04:31 PM   #18
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mine wont upshift to high untill 45mph or higher unless I do manual shift I wonder if this is why Im getting such sh---y mpgs 12-13.5 cty and not over 18 hwy at 65mph
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Old 07-10-2012, 04:51 PM   #19
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Mine seems fine After I got used to what I called an accelerator delay when beginning from a stop and the engine braking. I really dont notice it now. 2012 JKU auto.

Now since it is computer controlled and has throttle by wire, why not give us some preprogrammed performance options? How about highway, stop/go, wheeling (rock crawling, mudding or sand) modes?

I have seen the modes option on a motorcycle, the Ducati Diavel and I thought it would be great for the Wrangler. It even allows control of the ABS and traction control.

Forgive the Italian with English subtitles but a system like that would be awesome! Maybe Fiat can buy the idea from their Italian neighbors at Ducati?

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Old 07-13-2012, 01:07 AM   #20
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My trans downshifts a little harsh, but I think it's mostly due to the steep gear ratio changes compounded with standard axle gearing. If anything I'd say it's more reluctant to not upshift soon enough, wanting to hold a lower gear at 2500 rpm & steady speed before upshifting at city speeds 25-50 mph.

Quote:
Originally Posted by joe buell View Post
mine wont upshift to high untill 45mph or higher unless I do manual shift I wonder if this is why Im getting such sh---y mpgs 12-13.5 cty and not over 18 hwy at 65mph
I can force mine into 5th with a tap to the right on the shifter if I'm light on the gas, but not until it's doing at least 40.

What mods do you have? Mine's mostly stock, Dueler 18s with limited slip but standard gearing... I'm getting between 17 and 25 mpg. Recent 4000+ mile trip got 22-23 mpg on most refuelings, 25.2 mpg doing 55-65 (more than 500 miles on that tank alone), and rushing the last leg doing 75-85 getting 20.4 mpg.
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Old 07-13-2012, 05:51 AM   #21
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Quote:
Originally Posted by joe buell View Post
mine wont upshift to high untill 45mph or higher unless I do manual shift I wonder if this is why Im getting such sh---y mpgs 12-13.5 cty and not over 18 hwy at 65mph
If you want better mileage try switching to non-ethanol gas this made a huge difference with my Jeep. Here is a link find your state and it lists city's and stations that sell gas without ethanol in it. Link-- Ethanol-free gas stations in the U.S. and Canada
Even no your Jeep was made to run on gas with 10% ethanol it was tested from the factory with 100% gasoline and that's what the window sticker was based on.
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Old 07-13-2012, 07:36 AM   #22
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Don't people test drive the Jeep they are buying before purchasing? City, highway, up hills, etc?
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Old 07-14-2012, 01:52 PM   #23
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no problems with 2012 jk-S

hi, have had no problems with my 2012 jk-S did have some problemswith my 2007 jk-S but can't remember what the fix was..
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Old 07-14-2012, 03:32 PM   #24
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I test drive 3 jeeps before buying mine. Personally they all drive like that. I think it has to do with mpg set up. If you have a 12 and it bothers you that much you can alway just use the manual portion of the auto. I've used it when towing gives you more control of the shifting.
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Old 07-14-2012, 09:40 PM   #25
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kind of hard to figure what mpgs you might get when your test drive last about 6 miles here in flat land FL just today towed my bike trailer at #495lbs 70miles roudtrip at 65mph with cruise on about 2300rpm and eco radically turning on and off flat interstate and avg mpg showed 13-14.4mpgs now that sucks I dont get how everyone gets such good mpgs when mine is like this at all times just seems to get worse as time goes by and all Ive added is what you see rubicon takeoff tires/rims 65lb winch 80lb bumper can someone give some reason WHY its so bad I do not mean to bash Jeep I love it but its frustrating as hell when you here about all the good mpgs everyone is getting and mine sucks it Joe.
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Old 07-14-2012, 10:49 PM   #26
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Maybe we ought to go driving, see what my bone-stock '12 Sahara gets doing the same route you are... Could be the knobby tires doing a little, but wouldn't think it'd be that much. I do know that if I'm driving around here on Cortez/Manatee/University/Tamiami I tend to tap it up into 5th to eke out a little more mpg if I'm already up to speed.
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Old 07-15-2012, 07:04 AM   #27
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JKU SRQ might be a good idea to get together hey if nothing else find some good trails pm me lets swap phone#s and compare driving habbits and such 17mpg s I have never seen that even when it was bone stock best ever 18mpg hwy at 65mph I truly think something is wrong with it had it to the dealer and was told if it got 15cty I was 1 of the few and lucky thats there attitude????? wuld love to go to NC on vac but it would be cheaper to rent a cadilac for the diff in fuel unreal Joe.
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Old 07-23-2012, 08:07 AM   #28
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Quote:
Originally Posted by joe buell
kind of hard to figure what mpgs you might get when your test drive last about 6 miles here in flat land FL just today towed my bike trailer at #495lbs 70miles roudtrip at 65mph with cruise on about 2300rpm and eco radically turning on and off flat interstate and avg mpg showed 13-14.4mpgs now that sucks I dont get how everyone gets such good mpgs when mine is like this at all times just seems to get worse as time goes by and all Ive added is what you see rubicon takeoff tires/rims 65lb winch 80lb bumper can someone give some reason WHY its so bad I do not mean to bash Jeep I love it but its frustrating as hell when you here about all the good mpgs everyone is getting and mine sucks it Joe.
Towing at 65 mph I understand 14/15 mpg. But dry you should be getting more. I was getting avg 16mpg with stock sport wheels. Then down to 14avg mpg after 33's. Once I put the right tire size in with the AEV procal I've been avg 17 mpg or my last 4 tanks. That's hand calculated.
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Old 07-23-2012, 09:22 AM   #29
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These suckers love to lug. Mine is the same way and it's annoying. You either have to push the pedal halfway or more to get it to downshift or pop it into manual mode. I have just learned to drop it to 4th whenever I start climbing a hill.
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Old 08-03-2012, 02:07 PM   #30
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not experienced this

We have a 2012 Sport with Auto Trans and I must say I have not experienced this at all after 5K miles.

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