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View Full Version : JKU 2015 Transmission issue. Help!



zerorex
01-23-2016, 01:02 AM
1/22/2016
Issue when Driving Jeep Wrangler.

Transmission was stalling when pressing on gas. When trying to go in reverse the car would rev, but would not go in reverse. To fix it I had to go into park and then go back into reverse and then I could reverse the car. It seemed every time I had an issue it was after stopping and the vehicle went into eco-mode. After turning off the vehicle and restarting the problem was gone.

Full disclosure when I originally wired the backup camera, I used a T-tap and connected it to the jeeps 3rd brake light. Since that was the wrong way to power it I cut the red wire (left the ground connected to the 3rd brake light ground (T-tapped as well)) and crimped it to the provided cable for the backup camera.

Heholua
01-23-2016, 01:10 AM
On the way home from our last summer run up in Tahoe, Trail Bud, WOLette and I decided to make a detour and do a quick run up to Kavanaugh Ridge. This is one of our most favorite places to visit in the Sierra Nevada Mountains as it takes you up to 11,000 feet and offers views that are to die for. Of course, because of its extreme location, getting up here can be tough as deep snow often blocks the trail well into July. And, if you can get up there, hurricane force winds, thick clouds and a lot times, smoke from forest fires can put a damper on things but for us on this trip, it was about as perfect as it gets. Here are a few shots that we took while we were there.

A quick stop we made along the shores of a beautiful un-named lake...
http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260528

http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260520

On our way up to the top with Mono Lake in the background...
http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260536

A few poser shots on top of the ridge...
http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260582

http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260548

http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260604

View from the cliffs looking west toward East Lake, Green Lake and West Lake...
http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260646

Shot of West Lake trickling into Green Lake...
http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260650

Looking southwest out toward the Hoover Lakes...
http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260682

And finally, Tessa keeping an eye out for Marmotts...
http://project-jk.com/gallery2/main.php?g2_view=core.DownloadItem&g2_itemId=260700

If you would like to see all the pics we took on this quick little detour on our way home from Tahoe, simply click on the link below:

Kavanaugh Ridge Run 2011 Photo Gallery (http://project-jk.com/wpg2?g2_itemId=260516)

:cool:

There is transmission software update for the 2015s. Have you had this done yet?

2nd.gunman
01-23-2016, 01:26 AM
Did I miss something.

zerorex
01-23-2016, 01:26 AM
I just brought my vehicle to the jeep dealership last weekend and they said there was some updates they had to do. I am assuming that was the update? Or is it something I should have done myself? This is my first jeep so still learning :)

zerorex
01-23-2016, 01:36 AM
Just checked the paperwork from the dealership. They did a R39 BCM Recall, which is not a transmission update. So no transmission update was done.

Heholua
01-23-2016, 01:36 AM
Did I miss something.

I don't know how that happened, I quoted zerorex and that's what posted.:what:



I just brought my vehicle to the jeep dealership last weekend and they said there was some updates they had to do. I am assuming that was the update? Or is it something I should have done myself? This is my first jeep so still learning :)

Probably so on the update. No it's not anything you can do yourself, Dealership only.

zerorex
01-23-2016, 01:46 AM
I'll call and make an appointment for the update. Thanks for the tip! Just to clarify, could using ttaps be causing a possible short and that's causing the transmission issue? I know I'm grabbing at straws.

Heholua
01-23-2016, 02:23 AM
I'll call and make an appointment for the update. Thanks for the tip! Just to clarify, could me using ttaps be causing a possible short and that's causing the transmission issue? I know I'm grabbing at straws but I want to make sure I didn't screw anything up.


Honestly, I couldn't tell you if the TTAPS are causing your problem.

zerorex
01-23-2016, 02:51 AM
No worries I checked the ttaps and have all solid connections it's doesn't look like its the issue I'll get the update done you suggested and I'll keep a record in case it happens again. Thank you man for your help. Never experienced this before with any vehicle and was going a little crazy...you eased my anxiety [emoji106]

RMC2
01-23-2016, 02:58 AM
Since it sounds like it happened after the change, I honestly would try disconnecting the camera power, and the mygig and leaving the battery disconnected for a few minutes to reset everything. Then see if the problem is still there. With the computer controls, crazy stuff happens.

I wonder if you connected the camera wires to the wrong wires and that is causing a power feedback issue that is causing the computer to act up. The mygig end should have been hard to mess up, but double check everything.

Good luck. Sounds crazy.

ScoobyCarolanNC
01-23-2016, 04:09 AM
I don't know how that happened, I quoted zerorex and that's what posted.:what.

This post also need the transmission software update

Heholua
01-23-2016, 06:57 AM
This post also need the transmission software update

:D:thumbup:...........

zerorex
01-24-2016, 11:01 PM
184318 Welp I had all intentions about calling to schedule my jeep for the update and now this light came on... I really hope this isn't something bigger

zerorex
01-29-2016, 12:01 AM
There is transmission software update for the 2015s. Have you had this done yet?

So I took the Jeep to the dealership and they scanned for a code and they did not find one. They did the transmission update and they said the issue has been fixed. I have had the jeep back for two days and I am not having any of the previous issues, but actually a new one...kind of.

Since the transmission flash update when in first gear i get to around 1500-2000rpm and then the jeep kicks forward and changes to the 2nd gear. In 2nd gear it gets to about 2000-2500rpm and then kicks into 3rd. After 3rd the kicking stops when shifting gears. The vehicle does feel a little sluggish from what it was, but it could just me be re acclimating myself.

I called the dealer and they said after flashing for the tranny update the vehicle has to re learn your driving habits and over the next 2 weeks it will adjust itself and the kicking should stop. If it does not stop, I can call up and have it looked at again. Is this an actual thing or are they pulling my chain? I've never heard of a transmission needing to adjust to driving habits, but then again the new wranglers have so much controlled by electronics I could be wrong.

Any advice?

Jeepnoub
01-29-2016, 12:32 AM
So I took the Jeep to the dealership and they scanned for a code and they did not find one. They did the transmission update and they said the issue has been fixed. I have had the jeep back for two days and I am not having any of the previous issues, but actually a new one...kind of.

Since the transmission flash update when in first gear i get to around 1500-2000rpm and then the jeep kicks forward and changes to the 2nd gear. In 2nd gear it gets to about 2000-2500rpm and then kicks into 3rd. After 3rd the kicking stops when shifting gears. The vehicle does feel a little sluggish from what it was, but it could just me be re acclimating myself.

I called the dealer and they said after flashing for the tranny update the vehicle has to re learn your driving habits and over the next 2 weeks it will adjust itself and the kicking should stop. If it does not stop, I can call up and have it looked at again. Is this an actual thing or are they pulling my chain? I've never heard of a transmission needing to adjust to driving habits, but then again the new wranglers have so much controlled by electronics I could be wrong.

Any advice?

I think they are pulling your chain. They are hoping the issue fixes itself. I dealt with all 3 months I owned my 2015 cherokee. The kept reflashing the transmission and telling me everything was normal. The difference with mine was it would lunge forward right before coming to a stop. So Atleast yours isn't doing that.

Jeepnoub
01-29-2016, 01:13 AM
I should also add. This is probably standard diagnostic procedure directed from chrysler. From my experience manufacturers like wait until complete failure to replace something. So as long as you have a warranty you should be ok. Just have to jump through the hoops.

jeeeep
01-29-2016, 05:23 AM
try this -Jeep Electronic Control Unit Reset

http://www.quadratec.com/jeep_knowledgebase/article-89.htm

I used it when I changed tires and my transmission was doing a similar thing yours, if you have a tune, install the stock tune 1st then do the procedure.

it cured the "hard" shift issues I was having and took the performance tune without any problems

ScoobyCarolanNC
01-29-2016, 12:34 PM
try this -Jeep Electronic Control Unit Reset

http://www.quadratec.com/jeep_knowledgebase/article-89.htm

I used it when I changed tires and my transmission was doing a similar thing yours, if you have a tune, install the stock tune 1st then do the procedure.

it cured the "hard" shift issues I was having and took the performance tune without any problems

What does "ground the positive cable to the negative cable for 30 seconds mean"? I'm no electrician so if I did what I THOUGHT that wanted me to do, I'm pretty sure the next step might be "dial 911 and ask for the fire department"....

WJCO
01-29-2016, 01:06 PM
What does "ground the positive cable to the negative cable for 30 seconds mean"? I'm no electrician so if I did what I THOUGHT that wanted me to do, I'm pretty sure the next step might be "dial 911 and ask for the fire department"....

Just take the charge like a man :D. Lol. If you disconnect the positive from the battery and touch it to the negative, it won't do anything as there is no power source completing the circuit to cause any issues. I've had to do this on a lot of vehicles to clear memory data. I usually take both cables off and touch them to each other for about 10 seconds.

zerorex
01-29-2016, 01:42 PM
Hello all! So I have been keeping a log of the issue and here's an excerpt from the log of what's currently happening:

1/28/16 - Thursday 3:04pm
Vehicle is working fine, but ever since the transmission update was done (Flashed from 05150891AD to 68271728AA), the vehicle makes a jerking motion when changing gears. At about 1500-2000rpm changing from first to second gear the jeep will now jerk forward and again between 2000-2500rpm when changing gears from 2nd to 3rd gear. I called the dealer and was told that there was a break-in period and I should give the vehicle about 1-2 weeks to relearn my driving habits so that the gear changing adjusts to me. If the gear change jerking issue is unresolved, schedule an appointment and they will address the issue.

Information on TCM Flash Update - 68271728AA
2015 Jeep Wrangler Power Train Service Bulletin 383883
Action Number: 10057945
Service Bulletin Number: 383883
Report Date: Apr 21, 2015
Component: Power Train
Summary: Chrysler 2014-2015 jeep wrangler: information regarding transmission control module available software. Customers are experiencing delayed shift response when driving up hills, vibration on acceleration from a cruising speed

1/29/16 - Friday 7:30am
Driving to work, 1st and 2nd gear transmissions had none of the jolting sensations. When going from 2nd to 3rd gear at a speed of 40-45mph (2000-3000rpm) the car was predominantly jolting/jerking forward. This was consistently happening while traveling down Hylan Blvd. At 7:23am when arriving at my destination the MIL (Check Engine Light) came on again. I will be contacting the dealer to bring it back a 2nd time for the transmission issue.

They are going to take the vehicle in on Monday. Hopefully they'll resolve it. I am currently leasing the vehicle and it sucks because I really wanted to buy it. I have about $12k in upgrades i planned on doing and have the funds waiting. It's honestly making me want to not spend a penny on this jeep and thats a sucky feeling.

2nd.gunman
01-29-2016, 01:43 PM
So I took the Jeep to the dealership and they scanned for a code and they did not find one. They did the transmission update and they said the issue has been fixed. I have had the jeep back for two days and I am not having any of the previous issues, but actually a new one...kind of.

Since the transmission flash update when in first gear i get to around 1500-2000rpm and then the jeep kicks forward and changes to the 2nd gear. In 2nd gear it gets to about 2000-2500rpm and then kicks into 3rd. After 3rd the kicking stops when shifting gears. The vehicle does feel a little sluggish from what it was, but it could just me be re acclimating myself.

I called the dealer and they said after flashing for the tranny update the vehicle has to re learn your driving habits and over the next 2 weeks it will adjust itself and the kicking should stop. If it does not stop, I can call up and have it looked at again. Is this an actual thing or are they pulling my chain? I've never heard of a transmission needing to adjust to driving habits, but then again the new wranglers have so much controlled by electronics I could be wrong.

Any advice?

Almost all modern automatics constantly adjust their programming to provide the smoothest operation possible. This is to account for component wear and driving style. I.e. Throttle position vs load. You quite often find that if a car has be thrashed its whole life then sold to someone who baby's it, it will shift really harsh for awhile until it adjusts.

ECMs do it as well in Australia the ford falcon 4.0 6cyl is notorious for running perfectly until you get a flat battery and it loses its memory, forgets how worn out it is and will barely idle. But after a few weeks of driving is back to normal

zerorex
01-29-2016, 01:45 PM
try this -Jeep Electronic Control Unit Reset

http://www.quadratec.com/jeep_knowledgebase/article-89.htm

I used it when I changed tires and my transmission was doing a similar thing yours, if you have a tune, install the stock tune 1st then do the procedure.

it cured the "hard" shift issues I was having and took the performance tune without any problems

If the dealer doesn't resolve it i'll 100% do this. Thanks for the tip!


Almost all modern automatics constantly adjust their programming to provide the smoothest operation possible. This is to account for component wear and driving style. I.e. Throttle position vs load. You quite often find that if a car has be thrashed its whole life then sold to someone who baby's it, it will shift really harsh for awhile until it adjusts.

ECMs do it as well in Australia the ford falcon 4.0 6cyl is notorious for running perfectly until you get a flat battery and it loses its memory, forgets how worn out it is and will barely idle. But after a few weeks of driving is back to normal

In a strange way this actually makes me feel better! Thanks for the information. Why would the check engine come on if its just adjusting?

Heholua
01-29-2016, 11:29 PM
Hello all! So I have been keeping a log of the issue and here's an excerpt from the log of what's currently happening:

1/28/16 - Thursday 3:04pm
Vehicle is working fine, but ever since the transmission update was done (Flashed from 05150891AD to 68271728AA), the vehicle makes a jerking motion when changing gears. At about 1500-2000rpm changing from first to second gear the jeep will now jerk forward and again between 2000-2500rpm when changing gears from 2nd to 3rd gear. I called the dealer and was told that there was a break-in period and I should give the vehicle about 1-2 weeks to relearn my driving habits so that the gear changing adjusts to me. If the gear change jerking issue is unresolved, schedule an appointment and they will address the issue.

Information on TCM Flash Update - 68271728AA
2015 Jeep Wrangler Power Train Service Bulletin 383883
Action Number: 10057945
Service Bulletin Number: 383883
Report Date: Apr 21, 2015
Component: Power Train
Summary: Chrysler 2014-2015 jeep wrangler: information regarding transmission control module available software. Customers are experiencing delayed shift response when driving up hills, vibration on acceleration from a cruising speed

1/29/16 - Friday 7:30am
Driving to work, 1st and 2nd gear transmissions had none of the jolting sensations. When going from 2nd to 3rd gear at a speed of 40-45mph (2000-3000rpm) the car was predominantly jolting/jerking forward. This was consistently happening while traveling down Hylan Blvd. At 7:23am when arriving at my destination the MIL (Check Engine Light) came on again. I will be contacting the dealer to bring it back a 2nd time for the transmission issue.

They are going to take the vehicle in on Monday. Hopefully they'll resolve it. I am currently leasing the vehicle and it sucks because I really wanted to buy it. I have about $12k in upgrades i planned on doing and have the funds waiting. It's honestly making me want to not spend a penny on this jeep and thats a sucky feeling.


Do you by chance have larger tires than stock? If so have you reprogrammed the computer to the correct tire size?

2nd.gunman
01-29-2016, 11:44 PM
If the dealer doesn't resolve it i'll 100% do this. Thanks for the tip!



In a strange way this actually makes me feel better! Thanks for the information. Why would the check engine come on if its just adjusting?

The check engine light doesn't come on the engine just runs very rough until the fuel/air maps update again. It's pretty funny to see as quite often the car will be some beat up junk with 600k on the original motor that's never been apart running like a dream until the battery goes flat. Then absolute pig for a couple weeks until it readjusts.

blrr0311
01-30-2016, 12:59 AM
how many miles you got on your jeep so far? i have the same year 2015 rubicon jku i have 20,450 on it so far. so far so good on my end.

jtpedersen
01-30-2016, 01:43 AM
The thing about the trans learning is that it's should be very subtle. Ask yourself this: how'd it drive when you first bought it? It likely drove fine even though it knew nothing about u;). That's the flaw in dealer logic.

zerorex
01-31-2016, 04:28 PM
Do you by chance have larger tires than stock? If so have you reprogrammed the computer to the correct tire size?

Nope tires are still stock.


how many miles you got on your jeep so far? i have the same year 2015 rubicon jku i have 20,450 on it so far. so far so good on my end.

6800 miles so yea...it's low


The thing about the trans learning is that it's should be very subtle. Ask yourself this: how'd it drive when you first bought it? It likely drove fine even though it knew nothing about u;). That's the flaw in dealer logic.

That's what drives me crazy in the back of my mind. It didn't drive like this before and i cant stop thinking that to myself.

Well there is semi good news. Here's the latest update:

1/29/16 - Friday 7:30pm
The MIL (Check engine light) went off. The vehicle is still jolting/pushing forward randomly between gears. It is not during a specific gear change anymore. It is not happening as frequently anymore as well. The vehicle is still acting strange randomly after stopping the vehicle. The vehicle will stay completely still and not roll forward like normal operation. Once pressing on the gas the vehicle will rev as it its struggling and then start moving. It happens very randomly (maybe the solenoid, filter or the transmission fluid?) and will go away after restarting the vehicle.

jeeeep
01-31-2016, 05:48 PM
try resetting it per the instruction in my previous post, it should resolve the issue immediately no learning period... these systems are fast to learn, you shouldn't still be having issues.

if the reset doesn't solve it take it back to the dealer and tell them it's still not working, with such low miles and stock tires you shouldn't be having this issue.

zerorex
01-31-2016, 09:17 PM
try resetting it per the instruction in my previous post, it should resolve the issue immediately no learning period... these systems are fast to learn, you shouldn't still be having issues.

if the reset doesn't solve it take it back to the dealer and tell them it's still not working, with such low miles and stock tires you shouldn't be having this issue.

So I did the ECU reset and took it for a drive. I did street driving as well as highway driving for about an hour. The stopping issue was non existent, but the changing gears issue seems to still be lingering. I honestly don't know if its because i'm hypersensitive right now and paying attention to every little thing or if it really is not normal.

Basically when changing gears between 3rd to 4th and/or 4th to 5th gear, randomly you'll feel a small push. The jeep hesitate for a second and then pushes forward. This could be normal operation but I never paid attention. The dramatic feeling of a hard kick isn't there, its more of a pushing feeling now.

In order to recreate the issue the vehicle must be driven at higher speeds and for an extended period of about 30-45min. It will not happen when initially driving after starting the vehicle. Highway driving is a must to recreate it.

jeeeep
01-31-2016, 09:41 PM
So I did the ECU reset and took it for a drive. I did street driving as well as highway driving for about an hour. The stopping issue was non existent, but the changing gears issue seems to still be lingering. I honestly don't know if its because i'm hypersensitive right now and paying attention to every little thing or if it really is not normal.

Basically when changing gears between 3rd to 4th and/or 4th to 5th gear, randomly you'll feel a small push. The jeep hesitate for a second and then pushes forward. This could be normal operation but I never paid attention. The dramatic feeling of a hard kick isn't there, its more of a pushing feeling now.

In order to recreate the issue the vehicle must be driven at higher speeds and for an extended period of about 30-45min. It will not happen when initially driving after starting the vehicle. Highway driving is a must to recreate it.

try using the tap shift to go thru the gears, see if it still has that "push" sensation when you use only the tap shift

zerorex
02-01-2016, 01:05 AM
try using the tap shift to go thru the gears, see if it still has that "push" sensation when you use only the tap shift

Took the vehicle to the highway to try using the tap shift to go through the gears and see if it still has that "push" sensation (only using tap shift). The push sensation when shifting up could not be recreated, but a different issue was discovered. After getting off the highway (still using the tap shift for changing gears) the computer showed that I was in the 3rd gear even though i was at a complete stop. Once I started driving, it would not show if I was upshifting or downshifting. It just constantly displayed the [3]. After pulling over and switching the car into park and then back into drive, the tap shift no longer worked the rest of the way home. Only after getting home and turning the vehicle off and then back on, the tap shift began to show the gear shift numbers and worked again.

jeeeep
02-01-2016, 01:10 AM
Took the vehicle to the highway to try using the tap shift to go through the gears and see if it still has that "push" sensation (only using tap shift). The push sensation when shifting up could not be recreated, but a different issue was discovered. After getting off the highway (still using the tap shift for changing gears) the computer showed that I was in the 3rd gear even though i was at a complete stop. Once I started driving, it would not show if I was upshifting or downshifting. It just constantly displayed the [3]. After pulling over and switching the car int<script id="gpt-impl-0.7691701213066665" src="http://partner.googleadservices.com/gpt/pubads_impl_79.js"></script>o park and then back into drive, the tap shift no longer worked the rest of the way home. Only after getting home and turning the vehicle off and then back on, the tap shift began to show the gear shift numbers and worked again.

well, sorry to say it's back to the dealer. they haven't fixed the issue yet.

but at least you have something to show them so they can look at other transmission components.

it may be possible the flash didn't take hold the 1st time or there is a sensor out in the transmission.

m998dna
02-01-2016, 05:40 AM
Took the vehicle to the highway to try using the tap shift to go through the gears and see if it still has that "push" sensation (only using tap shift). The push sensation when shifting up could not be recreated, but a different issue was discovered. After getting off the highway (still using the tap shift for changing gears) the computer showed that I was in the 3rd gear even though i was at a complete stop. Once I started driving, it would not show if I was upshifting or downshifting. It just constantly displayed the [3]. After pulling over and switching the car into park and then back into drive, the tap shift no longer worked the rest of the way home. Only after getting home and turning the vehicle off and then back on, the tap shift began to show the gear shift numbers and worked again.

This is why I wouldn't allow the dealer to install the update... but reading this, it appears you have more issues than the factory update addresses. It appears you have a bad TCM... The auto-stick isn't working right.. it should automatically downshift to 1st when coming to a stop.. not stay in 3rd.

This transmission is used in many applications and is very robust.. but sensitive to certain things... Like H2O contamination, overfilling, underfilling and heat.

Tell your dealer you want the TCM changed... the "push" sensation you refer to may be resolved by a new TCM.. but you need to remember this transmission has adaptives, that's why they're telling you to drive it for two weeks. If you pull the battery cable for xx time it clears the adaptives and needs to relearn you driving style again.

But under no circumstances does it make the transmission shift "right" .. it should do that from the start. It may make your shifts feel more firm.. but thats it..

.

zerorex
02-01-2016, 01:59 PM
This is why I wouldn't allow the dealer to install the update... but reading this, it appears you have more issues than the factory update addresses. It appears you have a bad TCM... The auto-stick isn't working right.. it should automatically downshift to 1st when coming to a stop.. not stay in 3rd.

This transmission is used in many applications and is very robust.. but sensitive to certain things... Like H2O contamination, overfilling, underfilling and heat.

Tell your dealer you want the TCM changed... the "push" sensation you refer to may be resolved by a new TCM.. but you need to remember this transmission has adaptives, that's why they're telling you to drive it for two weeks. If you pull the battery cable for xx time it clears the adaptives and needs to relearn you driving style again.

But under no circumstances does it make the transmission shift "right" .. it should do that from the start. It may make your shifts feel more firm.. but thats it..

.

Ill tell them today. The MIL(Check engine light) came back on today at 7:21am so there is definitely an issue persisting and I've been suspecting the TCM as well.