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Old 12-17-2013, 02:40 PM   #1
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Transmission upshifting too soon?

I have a 2012 JKU Sport, all stock with 3.21 gears. I notice that it will upshift really soon. It will go into 4th gear at 28mph and lug the engine unitl I either hit the gas, or, downshift.

Is this normal? It is constantly upshifting and getting the RPMs at 1,300 or less when cruising.

Thanks All.

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Old 12-17-2013, 03:14 PM   #2
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just slam that pedal a bit harder, if your the 2nd hand owner just rest the computer by removing the battery cable for few mins so computer can start learn your driving behavior again and while learning push it harder

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Old 12-17-2013, 05:22 PM   #3
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Are you referring to the negative battery cable?

Any other ideas?
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Old 12-17-2013, 05:25 PM   #4
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What size tires?
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Old 12-17-2013, 05:27 PM   #5
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I mentioned in my OP that the JKU is all stock. The stock tires are 255/75/17.
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Old 12-17-2013, 07:30 PM   #6
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trans.

No, should not go into 4th gear at 28 MPH...I got a 2012 JKU, bought brand new, don't matter how you drive, you shouldn't be hitting 4th gear at 28MPH...I have the same size tires. Something is wrong.
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Old 12-17-2013, 07:39 PM   #7
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There is not ness. something wrong, I wouldn't go that far. I have had a Cherokee that would that, shift into 4th and lug around. Infact, alot of the new cars on the lot here that are auto, do the same thing. I am going to go with disconnect the battery and see if the shifting pattern changes. Every Jeep is different and they do learn your driving habits now, especially with the 3.6 and new 5spd auto.
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Old 12-17-2013, 08:10 PM   #8
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Had the same issue with my 2012 and 3.21s. Sadly, there is no way to modify the shift points. Your solutions are as follows...

1) Press the loud pedal a bit harder letting the engine rev a little more before shifting.
2) Manually shift it
3) Regear.

As I stated in various other threads, 3.21s are terrible gears (even for a stock Jeep) and should have never been offered.
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Old 12-18-2013, 09:56 AM   #9
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My '13 lug lug lugs. I really don't like it... I now manually shift it and its very crisp this way.

On a side note, I noticed I had a small puddle of oil sitting underneath my intake's throttle body plate. This is due to oil vapor being recycled from the crankcase. It's normal, but I noticed my wife's 2013 does not have the puddle and she drives a manual tranny. My theory is my auto tranny lugs so badly at too low of an RPM that the throttle plate is barely open causing the oil to accumulate on the throttle plate and drip down. My wife, driving a manual, is at higher RPMs therefore the throttle plate is more open and more often, so her crankcase oil vapor is getting fully sucked in to the engine.

Aaaannnyyywwways.
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Old 12-18-2013, 10:15 AM   #10
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Quote:
Originally Posted by NFRs2000NYC View Post
Had the same issue with my 2012 and 3.21s. Sadly, there is no way to modify the shift points. Your solutions are as follows...

1) Press the loud pedal a bit harder letting the engine rev a little more before shifting.
2) Manually shift it
3) Regear.

As I stated in various other threads, 3.21s are terrible gears (even for a stock Jeep) and should have never been offered.
^^^Agree, I do not have this issue with my 2013 automatic, but I have the 4.10 ratio.
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Old 12-18-2013, 10:21 AM   #11
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Interesting...

I DO have this issue with my 2013 (4.10's and auto). Drives me (no pun intended) crazy sometimes.

Might be a trip to the dealer in my future.
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Old 12-18-2013, 10:32 AM   #12
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This new 5 speed auto has a learning ECU in it and samples our normal driving habits.
So how that plays into this, I'm not really sure!

Sometimes all of this new technology is good, and some times not so good...........
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Old 12-18-2013, 10:57 AM   #13
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Quote:
Originally Posted by Old Dogger View Post
This new 5 speed auto has a learning ECU in it and samples our normal driving habits.
So how that plays into this, I'm not really sure!

Sometimes all of this new technology is good, and some times not so good...........
If the JK ECU is indeed "self learning" based on driver habits, disconnecting the battery for a while, then driving pretty aggressively for a tank or two should make it think you're a nutjob and keep the shift points up. Give it a shot.
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Old 12-18-2013, 11:01 AM   #14
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Quote:
Originally Posted by NFRs2000NYC View Post
If the JK ECU is indeed "self learning" based on driver habits, disconnecting the battery for a while, then driving pretty aggressively for a tank or two should make it think you're a nutjob and keep the shift points up. Give it a shot.
That would be first thing I'd do. Just make sure after you disconnect the battery you step on the brake pedal, and leave the battery disconnected for a little while to play it safe.
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Old 12-18-2013, 02:55 PM   #15
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I have the same problem. In the quest for better gas mileage I think they upshift the transmission too early. I auto stick it back down a gear or two when it gets annoying.

I notice it tends to happen when driving behind Toyota Corolla's more than any other vehicle.
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Old 12-18-2013, 02:57 PM   #16
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Originally Posted by WorkingMan View Post
I have the same problem. In the quest for better gas mileage I think they upshift the transmission too early. I auto stick it back down a gear or two when it gets annoying.

I notice it tends to happen when driving behind Toyota Corolla's more than any other vehicle.
Yes, they really BOG you down........
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Old 12-18-2013, 03:04 PM   #17
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Similar problem with my 2010, auto, 3.8L, 5.38s, 35s. Basically have to mash the throttle so it doesn't upshift so fast or keep overdrive off. Overdrive off, auto, 5.38s feels perfect for me around town other than the MPG being around 10-12.
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Old 12-20-2013, 05:43 PM   #18
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Same problem with 2013 diesel. Travel at a constant 30 through town, want to go a little faster and the transmission shifts up at 32. Give a bit more throttle, then a bit more and a bit more and it just bogs down. Then a bit more and finally it downshifts but by this time you've got the throttle wide open and shoot off far faster than you intend to. Lift off and of course it up shifts again. Feels like the transmission was born in 1942.
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Old 12-21-2013, 09:17 AM   #19
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I have the Auto, 3.21s, stock tires and I'm a hater. Manually shift it ALL the time.
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Old 12-21-2013, 09:47 AM   #20
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Chrysler claims that simply disconnecting the battery will not reset the transmission's learned shift points completely.

I would try disconnecting it and holding the neg and postitive cables together for a while. I know on the AEV site this is how they say to reset things when having issues with the procal.

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