Last post on Dec 06, 2013 at 12:29 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee
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Jeep Grand Cherokee, SUV
#1092 of 1101 2014 Jeep GC * speed fix TSB
Oct 17, 2013 (10:22 am)
I had just leased a 2014 after turning in my 2011 and what a big difference with the 8 speed tranny. Only driven a few hundred miles so far but the shifting was a little harsh compared to all the old 4 and 5 speeds we had. I went back to the dealer today after searching the internet and found this Jeep TSB # 21-007-13 REV B Oct 12, 2013. It supersedes older TSBs in regarding reflash of software for the transmission control module. It only takes about 15 minutes and the end result was great. No more hard shifts and clunking. I also like the electric power steering versus the old Hydraulic, it is easier to turn the wheels now and still feel the road.
Oct 30, 2013 (12:04 pm)
hi i have a 1996 grand cherokee zj 4ltr auto.When putting it into drive it seems to stay in one gear,it don t change up or down.Ive changed the box for another one,cleaned sump out and added new oil but still the same problem.according to haynes manuel there is a pcm(transmission control module under the bonnet just behind the fuse box which i have found but having read some of the questions in this forum about problems that other people are having with their jeep keep stopping im wondering if the pcm is anything to do with the auto trtansmission.Would like some advise as to what to look at next please.Many thanks
#1094 of 1101 Re: taz23 [taz23]
Oct 30, 2013 (2:34 pm)
Hi, you are probably stuck in second gear which is what happens when your transmission goes into "limp mode". We had the same problem and exchanged our TCM via an online store. However, this only resolve part of the problem. The limp was still returning but only occasionally. It turned out that the PCM was also malfunctioning as it was turning off the TCM. I'm not sure if you could get away with just changing the PCM but, I would definitely try that first. They are easy to swap out and the online has plenty of videos on how to do it.
Lake Tahoe Gal
#1095 of 1101 gcj transmission problems
Oct 31, 2013 (7:10 am)
many thanks for reply tahoegal.where do i find these videos on how to swap them please many thanks
#1096 of 1101 gcj transmission problems by taz23
Oct 31, 2013 (9:14 am)
We used the following company to exchange our PCM and TCM: carcomputerexchange.com They will need your VIN # in order to program the unit(s) before they send it to you. The cost was around $125 each. Much better than the $1,000 each that my local Jeep dealer wanted to charge for one unit and installation. To locate a video on how to install do a Internet search on your vehicle make and year with the keywords how to install PCM TCM video. There are several out for there for you to choose from.
My husband installed ours and he said it was pretty easy.
Best of Luck
#1098 of 1101 98 jeep transmission problem?
Nov 04, 2013 (5:16 am)
I think my tranny is gone in my 98 jgc limited, on take off it doesn't wanna shift into gear right away. And today Im on the highway I got up to 65 then it started actin up, slowed down and wouldn't go pass 25. So I got it back to the house and now it won't back up, so what yal think?
#1099 of 1101 96 grand cherokee 4ltr petrol non starter and auto trans shifting problem.
Nov 17, 2013 (10:21 am)
I have a 1996 cherokee 4ltr petrol auto trans.The first problem was the trans stuck in one gear which i still have,but now another problem,it won t start at all.There is no spark at the plugs.This model only has a pcm under the bonnet,it dont have a tcm for the trans.Now reading the haynes manuel (i no what yr thinking but needed some idea as ive never worked on one of these before)the manuel says the pcm controls the trans and everything else,so im thinking this may have packed up.It also says that from 98 onwards if the pcm was replaced it would have to be programmed to the car,now as mine is a 96 would i be able to get a pcm from mayb a breakers and just plug it in,yes or no.
#1100 of 1101 Re: 96 grand cherokee 4ltr petrol non starter and auto trans shifting problem. [taz23]
Nov 17, 2013 (5:12 pm)
Hi, It sounds like you are on the right track. Most Jeep problems end up being traced back to a computer module. You have been told correctly that your PCM will need to be programmed for your specific car but, the good news is the programming is completed by the parts supplier. All you need to do is provide them with your VIN number and they will program your PCM for you, all you have to do is install it. For installation please be sure to do the following exactly.
Remove the battery cables, positive first, then negative. When you remove the PCM cables be sure to use a few bristles from a clean dry new paint brush to clean out the inside of the connectors. Install the PCM. We have found it is best to let the unit sit overnight before reconnecting the cables. Be sure to reverse the connection order when reconnecting positive first, then negative. When you are done your Jeep should run fine.
#1101 of 1101 Service engine light
Dec 06, 2013 (12:29 pm)
I have a 97 F350 with a 7.3 engine, the service engine light is on, I had it checked and it is the box that is mounted on the fender well and has to do with the fuel, I am not sure what that is called can someone help with that. Thanks