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Old 12-05-2011, 11:46 PM   #1
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Wrangler JK & JKU Known Issues

Was wondering what are some known issues with the Wrangler JK & JKU?

Engine?
Body?
And more?

*I have read some forums and reviews about engine's blowing out and transmission issues. This is my biggest concern I would have. Can anyone give any input to this? From what I have read this is typically with 07-08 models.

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Old 12-05-2011, 11:57 PM   #2
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I can tell you one thing. The problems that I find on this forum are a small fraction compared to what I saw on the MINI forum when I briefly Sold my Rubi for a MINI.

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Old 12-06-2011, 12:40 AM   #3
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I have had my jku now for three years living in fairbanks alaska and had never really had any real problems with it yet. The only problem I've had is when it reaches to -40 or colder the transmission lines in the automatic start leaking
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Old 12-06-2011, 12:45 AM   #4
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automatic trannys without a tranny cooler can cause the jeep to burn to the ground..
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Old 12-06-2011, 01:06 AM   #5
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So do any of the Wrangler JK or JKU's come with a transmission cooler or is this something a owner of a Wrangler JK or JKU would need to install themselves.

And without having a transmission cooler and burning up the transmission, would this be due to going off road or just normal daily driving?

And if this is a known issue why would Jeep/Chrysler not have these installed.

Thanks
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Old 12-06-2011, 01:14 AM   #6
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Originally Posted by darkproximity View Post
automatic trannys without a tranny cooler can cause the jeep to burn to the ground..
almost 2 years in and my 2010 auto hasn't burned to the ground.....
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Old 12-06-2011, 01:17 AM   #7
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hence i said "can".. its happened.. its actually a recall item iirc... (should be covered regardless of warranty) check the jeep website w/your vin.. they should post any open recalls.. these can be covered out of warranty..

the tranny can overheat moreso when towing.. but i'd definitely double check for recall or TSB..
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Old 12-06-2011, 01:25 AM   #8
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hence i said "can".. its happened.. its actually a recall item iirc... (should be covered regardless of warranty) check the jeep website w/your vin.. they should post any open recalls.. these can be covered out of warranty..

the tranny can overheat moreso when towing.. but i'd definitely double check for recall or TSB..

yea, i have checked but no recall on my VIN....
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Old 12-06-2011, 01:28 AM   #9
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i wouldnt tow with it.. just saying..
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Old 12-06-2011, 01:29 AM   #10
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i wouldnt tow with it.. just saying..
don't have a hitch, so i won't be towing anything anytime soon!
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Old 12-06-2011, 01:49 AM   #11
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There is a TSB for 2008-2010 JK/U's.. if you're under warranty i'd recommend getting the service done..

Quote:
TSB: 2008-2010 JK Wrangler: Transmission Oil Cooler Lines May Weep Transmission Fluid"
SUBJECT:
Extended Warranty -Transmission Oil Cooler Lines May Weep Transmission Fluid At The Hose To Tube Crimp Joints (7 Years or 70,000 Miles Warranty Extension)


OVERVIEW:
This bulletin involves installing new transmission oil cooler supply & return line assembly.

MODELS:
2008 -2010 (JK) Wrangler
NOTE: This Extended Warranty Bulletin applies to vehicles equipped with 3.8L engine (sales code EGT) and an automatic transmission (sales code DGV) built before March 10, 2010 (MDH0410XX).

SYMPTOM/CONDITION:
Weeping transmission oil cooler lines at the hose-to-tube crimp joints.

DIAGNOSIS:
If the symptom/condition is experienced proceed to the repair procedure.

REPAIR PROCEDURE:

1. Open the hood
2. Raise the vehicle half way up on a suitable hoist.
3. The transmission oil cooler lines are weeping from the crimp joints
4. Remove the left front wheel and tire.
5. Remove and discard the plastic tie strap on the upper transmission oil cooler line for the oxygen sensor wiring.
6. Place a drain pan under the transmission oil cooler lines to catch any fluid that will drain out after disconnecting the lines from the transmission.
7. Using Special Tool 8875A, disconnect both transmission oil cooler lines from the transmission
8. Using approximately 10 psi of air pressure, carefully blow out the remaining oil from the transmission oil cooler and oil cooler lines.

NOTE: Blowing out all the transmission fluid from the original transmission oil cooler lines will eliminate having to clean oil from under the vehicle by the transmission oil cooler line connections.
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Old 12-06-2011, 02:06 AM   #12
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Originally Posted by darkproximity View Post
There is a TSB for 2008-2010 JK/U's.. if you're under warranty i'd recommend getting the service done..
Interesting, I've never seen that document....

My Jeep was built in Feb 2010....
I think a call to my dealer is in order....they've run my VIN every time I've gone in and no red flags in regards to that issue...

Thanks for sharing
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Old 12-06-2011, 02:08 AM   #13
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i only bring it up because i remember seeing a post about a jk catching fire.. the owners had to fight with chrysler/insurance to replace the vehicle.. pretty scary.. there are youtube videos of several burning.. the post in particular had a video with it.
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Old 12-06-2011, 03:07 AM   #14
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I remember when I lived in Tennessee I had three friends who worked for the Chrysler/Jeep call center for warranty and issues. They always complained about all the issues Chryslers/Jeeps have and how Chrysler/Jeep would fight to keep from paying or fixing anything. Alot of people would call with issues reguarding the Grand Cherokee and Wrangler saying this issue or that and Chrysler the Father of everything would say, you take it off road and you expect things not to happen? Well my friends said they always felt like shit saying these remarks to customers of vehicles which are rated and advertised to do what they do but of course this was Chryslers way of getting out of the issue.

I know they moved that call center elsewhere now and I have no idea if Chrysler has changed their minds and views on things now but I was like WTF. At that time I owned my Land Rover and couldnt help but to sit back and laugh about it. But at the same time I kind of felt sad because I always had room in my heart and love for the Wrangler's. Never cared for the Grand Cherokee as I felt they took it a little to luxury and and now that I look at it I feel they tried to make it more like a Land Rover/Range Rover - ish kind of SUV. I think they totally left behind what a true off road vehicle is. Yes, of course you can put all those switches, remotes, lights and mode dials for different types of terrian but it takes away from the true off road vehicle like the Wrangler, CJ's and old model Land Rovers like the Defender, Series 1,2,3, and Toyota Land Cruisers. Its really sad but its what sales.

Sorry if I got off topic, I just felt it belonged in there. I do think Chrysler/Jeep has done great with keeping the Wrangler going. Im not a fan of the new interior looks of the 2011 and 2012, its a little to luxury looking I think for a Wrangler and it appears they are getting more and more digital/electronics every few years. *I thought the same thing about the 2007-2010 JK's at first too. lol. Maybe when the newer ones of those role around then I wont think they are so much. lol
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Old 12-06-2011, 05:46 AM   #15
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Auto tranny cooler can be bought for less then $200 and easily installed

Excessive oil consumption on 07-08's is something to look . Seen random
story's of people not checking- running their crankcase low and boom
I check my oil weekly anyhow.

Like mentioned the auto tranny cooler. Easy fix/add on. New 12's have one.

I bought a pre owned 07 w/35,000
learned afterwards of the oil issues. Mine seems fine so far. I check once a week. I think it was a defect/blunder from a certain factory. The 3.8 itself has been around for over 20 yrs.

Once you decide google related TSB's
For then year. See if it was serviced at all, that would be my best advice.

Good luck
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Old 12-06-2011, 06:02 AM   #16
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WOW, Talk about getting side tracked....lol
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Old 12-06-2011, 06:42 AM   #17
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Quote:
Originally Posted by darkproximity View Post
hence i said "can".. its happened.. its actually a recall item iirc... (should be covered regardless of warranty) check the jeep website w/your vin.. they should post any open recalls.. these can be covered out of warranty..

the tranny can overheat moreso when towing.. but i'd definitely double check for recall or TSB..
You need to know what this recall is that you keep referring to. All it does is flash the computer to allow for the "hot oil" warning that wasn't present in all JK's.

Anyone who tows with an automatic should invest in a tranny cooler. The 2012 comes with a tranny cooler.
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Old 12-06-2011, 06:45 AM   #18
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i wasnt sure if it was a recall or not, i just know that jeep is aware there is a problem and whomever owns a jk should see that they dont have this issue, thats why i said "IIRC" "if i recall correctly".. I dont usually take much interest in JKs as i dont own one, and will never own one.. But far be it from me to not spread information regarding ones investment burning down to the ground because they werent made aware of a possible problem. Even if i cant recall specifics i'm hoping they'll do a bit more research..
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Old 12-06-2011, 06:49 AM   #19
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It was a recall, but it didn't fix anything. It was definitely pre-2011. IIRC, it only included early 2010's. The only thing it did was activate the hot oil warning light and put the system in limp mode.
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Old 12-06-2011, 06:52 AM   #20
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They took the cheap way out it seems.. but i guess i don't blame them, that'd be an expensive fix to do it the right way.. I just don't like how they fought to replace an obviously faulty vehicle.. not a good way to keep a customer.. people are more apt to tell others of a bad experience than a good one..
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Old 12-06-2011, 06:53 AM   #21
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Quote:
Originally Posted by daggo66 View Post

Anyone who tows with an automatic should invest in a tranny cooler. The 2012 comes with a tranny cooler.
Are you sure? I don't see this mentioned anywhere.
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Old 12-06-2011, 06:54 AM   #22
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There have been reports of people asking for, and receiving, tranny coolers at no cost. However, that is not an automatic part of that recall.
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Old 12-06-2011, 06:57 AM   #23
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Quote:
Originally Posted by kjeeper10
Auto tranny cooler can be bought for less then $200 and easily installed

Excessive oil consumption on 07-08's is something to look . Seen random
story's of people not checking- running their crankcase low and boom
I check my oil weekly anyhow.

Like mentioned the auto tranny cooler. Easy fix/add on. New 12's have one.

I bought a pre owned 07 w/35,000
learned afterwards of the oil issues. Mine seems fine so far. I check once a week. I think it was a defect/blunder from a certain factory. The 3.8 itself has been around for over 20 yrs.

Once you decide google related TSB's
For then year. See if it was serviced at all, that would be my best advice.

Good luck
Make sure I understand: all 2012s have tranny cooler? I'm ordering one with max tow bc plan to use with my boat.
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Old 12-06-2011, 07:03 AM   #24
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Quote:
Originally Posted by fan of fanboys

Make sure I understand: all 2012s have tranny cooler? I'm ordering one with max tow bc plan to use with my boat.
All automatics I believe
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Old 12-06-2011, 07:07 AM   #25
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Leaks, leaks, leaks. Some do and some dont. I got one that does.
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Old 12-06-2011, 07:17 AM   #26
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My 2012 had a trans cooler installed from the factory.
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Old 12-06-2011, 07:40 AM   #27
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Leaks, leaks, leaks. Some do and some dont. I got one that does.
What took you so long?
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Old 12-06-2011, 08:00 AM   #28
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The biggest problem that I find owning a JK is the aftermarket companies keep coming out with cool new stuff. Now I want to buy a second JK just to mod that one to...
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Old 12-06-2011, 08:09 AM   #29
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The biggest problem that I find owning a JK is the aftermarket companies keep coming out with cool new stuff. Now I want to buy a second JK just to mod that one to...
I can save you a lot of money by not having to buy a new Jeep and you could just mod mine.....
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Old 12-06-2011, 08:15 AM   #30
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I can save you a lot of money by not having to buy a new Jeep and you could just mod mine.....
Not a bad idea! Just drive your Jeep on over and bring your mods with ya. I will be happy to help you install them in my garage. That should give me a Jeep fix for a while. I will supply the "spiced eggnog".

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