2015 JGC 8-Speed Transmission Issues - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 -

Reply
 
Thread Tools Display Modes
 
  #1  
Old 05-18-2015, 09:25 PM
Member
 
Join Date: May 2012
Posts: 96
Thanks: 13
Thanked 18 Times in 16 Posts
Rep Power: 1957
Eugene The Jeep is on a distinguished road
2015 JGC 8-Speed Transmission Issues

Hi all,

Just curious if anyone else here with either a 2014 or 2015 JGC had or is currently having issues with 8-speed trans? I just can't get used to this thing. It never drives the same way twice. I know that the dealer won't be able to reproduce or ID any issues; it is just a quirky ride. Am I alone in this? Sometimes the upshifts from 1-2 or 2-3 feel late, other times, it glides without issue. Once I make it to 3 and up, it's smooth sailing. The main gripe is getting there. I find it most noticeable at first upshift after having been parked. Seemed to be more prominent with ECO on at first, but even had a couple instances of "quirkiness" with ECO off. A call into the dealership yielded the response "The 8-speed requires getting used to." I also feel that when you are in ECO and the thing wants to upshift and you decelerate for whatever reason, it'll keep RPMs high so it can still upshift on its own. I know the ECO mode changes the "shift" schedule, so I assume this is all part of that. By the way, car is 1 month old, 1000 miles. 2015 Limited. Thanks for reading!

Reply With Quote
The Following User Says Thank You to Eugene The Jeep For This Useful Post:
Sponsored Links
Advertisement
 
  #2  
Old 05-18-2015, 09:51 PM
antsjeep's Avatar
Senior Member
My Jeep: 2015 WK2
 
Join Date: Feb 2010
Posts: 2,443
Thanks: 269
Thanked 263 Times in 228 Posts
Rep Power: 18703
antsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond reputeantsjeep has a reputation beyond repute
2015 JGC 8-Speed Transmission Issues

oh boy, not another one! 😕


Sent from my iPhone using JeepGarage
__________________
2015 Altitude - Billet Silver
SRT Springs, Taillight Bezels, Red Start Button, Pedals & Grille Mesh, Black Lugs,
Mopar 4" Chrome exhaust tips, 1.25" Bora Wheel Spacers,
DDM 5500k HID,
Red LED 3157 Bulbs, 15% Tint, Polk DB Center Channel, Mopar All Weather Mats

Reply With Quote
  #3  
Old 05-18-2015, 10:07 PM
bill_de's Avatar
Premium Member
My Jeep: 2017 5.7L WK2
 
Join Date: Sep 2012
Posts: 8,661
Thanks: 742
Thanked 1,092 Times in 850 Posts
Rep Power: 1806092
bill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond reputebill_de has a reputation beyond repute
Re: 2015 JGC 8-Speed Transmission Issues

If you do a search you'll see you are far from the first to post about this. If you read the other threads you will learn more about the issues and which 8 speeds are more likely to be affected.


---
__________________
If you need a shoulder to cry on ...
... pull over to the side of the road!

Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old 05-18-2015, 10:28 PM
Benn0's Avatar
Senior Member
 
Join Date: Oct 2013
Location: Brisbane, Australia
Posts: 2,181
Thanks: 116
Thanked 363 Times in 279 Posts
Rep Power: 18984
Benn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond reputeBenn0 has a reputation beyond repute
Garage
Re: 2015 JGC 8-Speed Transmission Issues

Try disabling hill start assist too. Mine drives so much better with it off.
__________________
MY14 Grand Cherokee LTD CRD - ORA2 & QL | Mopar 18" Night Fever Rims & Rock Rails | Chief Recovery Hooks & Sump Skid Plate | STMaxx 275/65R18
Reply With Quote
  #5  
Old 05-19-2015, 12:23 AM
Member
 
Join Date: May 2012
Posts: 96
Thanks: 13
Thanked 18 Times in 16 Posts
Rep Power: 1957
Eugene The Jeep is on a distinguished road
Re: 2015 JGC 8-Speed Transmission Issues

I just took it for a spin with ECO off. Its a lot better now. So hard to tell what affects this. I know adaptives play a role. Perhaps if I drive it awhile with ECO off, the software will have enough historical data to do the right thing. I've been turning ECO hoping that it'll be better without it, but when it's not different one minute in, I turn Eco back on. so maybe I'm
Not giving non-Eco a chance. Even if I'm wrong, don't tell
Me. Don't burst this momentary bubble of optimism
Reply With Quote
  #6  
Old 05-19-2015, 06:57 AM
Member
 
Join Date: Nov 2013
Posts: 63
Thanks: 1
Thanked 14 Times in 9 Posts
Rep Power: 1375
ramblinman is on a distinguished road
Re: 2015 JGC 8-Speed Transmission Issues

I have a 2015 gas 6 and we have had no problems with the trans. My wife mainly drives it and she's easy on the throttle. It's a learning transmission, so I guess it's adapted to her style. The only minor issue that i notice is that if you stop quickly from a high speed, the transmission has trouble keeping up with the downshifts at the end and there can be some a a couple of rough shifts at the very end, almost like a stutter in the drivetrain. I think that's due to the 8 speeds. But it's not a big deal. The low range shifts tend to hang at a cold start, but once we have driven a mile or so and the drive train starts to warm up, the shifts are fine for me. We have driven the Overland for 7 months including a trip from DC to C/FL. So far no repairs needed. Mileage is a little lower than I had hoped, but now that we're up to about 6k miles, I'm hoping for better mileage. Other than that, it's been trouble free.
Reply With Quote
  #7  
Old 05-19-2015, 07:24 AM
Hitchhiking
 
Join Date: Mar 2015
Posts: 113
Thanks: 4
Thanked 8 Times in 6 Posts
Rep Power: 0
2014wk2 is on a distinguished road
Re: 2015 JGC 8-Speed Transmission Issues

Isn't this a banned topic?
Reply With Quote
  #8  
Old 05-19-2015, 09:20 AM
JTS97Z28's Avatar
Premium Member
My Jeep: 2015 3.6L WK2
 
Join Date: Jan 2011
Location: Plainfield, IL
Posts: 3,877
Thanks: 90
Thanked 629 Times in 459 Posts
Rep Power: 28894
JTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond repute
Re: 2015 JGC 8-Speed Transmission Issues

Quote:
Originally Posted by Benn0 View Post
Try disabling hill start assist too. Mine drives so much better with it off.
Is this proven to effect how the transmission shifts or is this something someone decided to do and claimed it made a difference?
__________________
2015 Jeep Grand Cherokee High Altitude, Bright White, V6, HK audio
Reply With Quote
  #9  
Old 05-19-2015, 10:37 AM
Premium Member
 
Join Date: Aug 2013
Location: Boston
Posts: 1,930
Thanks: 45
Thanked 237 Times in 186 Posts
Rep Power: 77254
mswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond repute
Re: 2015 JGC 8-Speed Transmission Issues

I'd wait a few thousand miles more. Although my new 2015 seemed to feel perfect from day one.


My 2014 which had several firmware updates and what felt like a long break in to feel right. Part of that break in, might have been ME. After that it was silky smooth 0mph to what ever and back to 0mph. Never bother shutting off ECO mode.


The problem could be a valve body issue, which seem to be hard to diagnose with all the other issues floating around including the learning phase (for both user and transmission).


The problem could be partly you. It drives great for me. But it may not be your cup of tea if you drive differently.


It never seems to shift too late or to early. And does not hunt on the highway hills.
It's just rock solid. It never hesitates when you step on it, from a stop or on the highway.


If it is hardware, hopefully it will get bad enough soon to be obvious for the dealer to fix.
__________________
07-24-2017 Summit 3.6L Velvet Red W/Black & Brown Int
Tires: OEM 20"/Nokian 18"
Situational awareness: Valentine One with V1Driver on IOS
Reply With Quote
  #10  
Old 05-19-2015, 10:38 AM
Premium Member
 
Join Date: Aug 2013
Location: Boston
Posts: 1,930
Thanks: 45
Thanked 237 Times in 186 Posts
Rep Power: 77254
mswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond reputemswlogo has a reputation beyond repute
Re: 2015 JGC 8-Speed Transmission Issues

Quote:
Originally Posted by Benn0 View Post
Try disabling hill start assist too. Mine drives so much better with it off.
Mine drives perfectly fine with it on. I've never tried turning it off though.
__________________
07-24-2017 Summit 3.6L Velvet Red W/Black & Brown Int
Tires: OEM 20"/Nokian 18"
Situational awareness: Valentine One with V1Driver on IOS
Reply With Quote
  #11  
Old 05-19-2015, 02:23 PM
GCJGC's Avatar
Member
My Jeep: 2015 5.7L WK2
 
Join Date: Apr 2015
Location: Northern Alabama
Posts: 26
Thanks: 13
Thanked 6 Times in 6 Posts
Rep Power: 819
GCJGC is on a distinguished road
Re: 2015 JGC 8-Speed Transmission Issues

I noticed a similar issue in my 2015 Overland, quirky is the word I would use to describe it as well. In particular, I had the "lag" between 2nd and 3rd gear. Almost like an old fashioned turbo lag. Nothing huge, just an annoyance that made me worry a bit that it was a symptom of bigger issues. Changing back and forth from Eco would sometimes seem to help and other times would not. Changing to "sport" always helped because the V8 makes me grin

I am at 2000 miles now and things seem to be evening out. The transmission is learning about me and I am learning about it. I am leaving this week on a 3-4000 mile trip so I'll see how it feels after that.

Not a single other question about the truck. No worries, no squeaks and rattles, nothing.
__________________
2015 JGC Overland 4x4, V8, Advanced Tech, Granite Crystal with Light Brown
Reply With Quote
The Following User Says Thank You to GCJGC For This Useful Post:
  #12  
Old 05-19-2015, 02:27 PM
Hitchhiking
 
Join Date: Mar 2015
Posts: 113
Thanks: 4
Thanked 8 Times in 6 Posts
Rep Power: 0
2014wk2 is on a distinguished road
Re: 2015 JGC 8-Speed Transmission Issues

Torque converter people.

turbo lag lol
Reply With Quote
Reply

Tags
2015

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
2006 JGC 5.7 hemi transmission issues The Stig Troubleshooting/Problems 2 07-08-2014 01:32 PM
how to make the "6 speed" transmission in 2012 Hemi actually work as a 6 speed? mikoz Suspension/Driveline/Brakes/Wheels/Tires 8 05-29-2013 07:04 PM
5 speed vs 6 speed, which is faster/more responsive? Keirik Grand Cherokee - WK2 - 14 03-04-2013 09:28 AM
Waiting for 2013 JGC 8 Speed Transmission rockrash Grand Cherokee - WK2 - 105 08-20-2012 11:32 AM
Waiting for 2013 JGC CRD + 8 Speed Transmission mcmartens New Members - Welcome! 3 01-02-2012 08:03 AM

» Premium Vendor Showcase
Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 10:38 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.