Ok, I'm frustrated and stressed out! My jeep started having issues a couple months back. Esp and bas lights would come on, as well as the skidding (traction?) light as well. Would continue to run fine. Then, the trans over temp light started coming on at random and the check engine light came on. Started downshifting every now and then. I would have to pull over and restart it . Sometimes would seem to lose power.The trans over temp would sometimes even come on at start up, first thing in the morning. Brought it to a well known transmission repair shop. They checked it out and replaced the Front controller module and transmission control module. Apparently, it lost communication with the TCM. Two weeks and $1800.00 later, I get it back, drive 15 miles, shut it off, turn it back on, 10 minutes later the esp, bas, and trans over temp comes back on. Only downshifted on me once so far. Got it home, went back out, no lights, no problems. Today, ALL the lights are back on including the check engine light. Brought it to Autozone, they checked it and it threw the same code, Lost communication with the TCM. Supposed to bring it back to the shop tomorrow, not sure what's going on here. I have read alot of negative feedback about this particular jeep with the SAME problem. It's not wheel sensors, no alignment issues, fluid is fine, no leaks. Does anyone know what the hell to do with this jeep? It has 68,000 miles on it
Oscarq
I have never diagnosed two controllers for the same problem before... EVER! That is some amazing diagnostician they have working on your rig. Oh wait, guess neither of those dice fixed the problem.
What exactly are the dtc's your getting?
What exactly are the dtc's your getting?
UO1O1
Just left it at Aamco. Waiting for a call. Autozone put it on their mini computer yesterday, same code as before the work was done. Lost communication with TCM...When we brought it to Aamco they ran a full computer diagnostic, said it threw 8 codes, Changed the front controller module. They said that cleared 7 of the 8 codes. Replaced the TCM with a reconditioned one and supposedly that cleared the last code. They said they drove it and no problems, all the codes cleared. I did note the milage when I dropped it off, there was a 27 mile difference. They didn't tell all what the 8 codes were. I picked it up Friday, drove about 20 minutes with no problems, shut it off for a few minutes, 5 minutes down the road all lights are back on, except the check engine. They go off when I restart it for a few minutes. Saturday the check engine light came on and hasn't gone back off. Occasionally it downshifts on me.
Just left it at Aamco. Waiting for a call. Autozone put it on their mini computer yesterday, same code as before the work was done. Lost communication with TCM...When we brought it to Aamco they ran a full computer diagnostic, said it threw 8 codes, Changed the front controller module. They said that cleared 7 of the 8 codes. Replaced the TCM with a reconditioned one and supposedly that cleared the last code. They said they drove it and no problems, all the codes cleared. I did note the milage when I dropped it off, there was a 27 mile difference. They didn't tell all what the 8 codes were. I picked it up Friday, drove about 20 minutes with no problems, shut it off for a few minutes, 5 minutes down the road all lights are back on, except the check engine. They go off when I restart it for a few minutes. Saturday the check engine light came on and hasn't gone back off. Occasionally it downshifts on me.
Good news! The jeep is fixed, $2000.00 and two modulars later... and a relay switch that kept shorting out. Thank God the jeep was equipped with a spare. So far no problems, has been running great for 2 weeks now. The modulars by themselves did not fix the problem. When we brought it back they found the relay switch shorting out. That was probably the problem all along. Thank you all for your input. This has been quite frustrating. In the three years I've owned this jeep, this has been the only problem, it has always been a very dependable vehicle. I appreciate all the comments and feedback. 
robbj24: I am having the same problems with my wife's Jeep. Wondered if replacing the trans relay switch fixed your problem?
Oscarq: was wondering what you meant by having a spare relay switch? when I look in the fuse box there isnt any relay switch located in the spot marked for "Trans Relay Switch." Was wondering if you had your mechanic wire a new one in?
Any help is greatly appreciated. Thanks guys
Oscarq: was wondering what you meant by having a spare relay switch? when I look in the fuse box there isnt any relay switch located in the spot marked for "Trans Relay Switch." Was wondering if you had your mechanic wire a new one in?
Any help is greatly appreciated. Thanks guys
Our spare was found under the dash by the steering column. I believe this was the problem all along. The mechanic said when one goes bad the others don't communicate with each other. We haven't had any problems since. We spent alot of money on labor and parts not needed only to find out the transmission relay was shorting out causing problems and false readings. Good luck!
We are currently having the same problem with our jeep. Your post has been very full of helpful information (sorry you had to go through so much trouble). The trans relay that was shorting out that finally fixed the problem when it was replaced, is it located in the fuses or under the steering column or where the spare was? I thought if we start with it, we may save some money trying to fix the problem. It acts like it is a short with an electrical item.
Under the dash on the driver's side if it is a V-6 or an 6.1 SRT (NAG1 transmission), or part of the PCM if it is a 4.7 or 5.7 V-8.
I’ve got a 2006 GC Overland 5.7. Having the same issues! ESP/bas light and traction control came on at the same time. Hard shift from 1-2. Shortly after, the trans temp warning comes up once in a while. Could someone PLEASE tell me where this trans relay switch is? I really need some help with this. Ive had a ton of issues and my Kids rely on me to transport them and I need to make it safe. Thanks for any help!
Hi, I've same issue. Car runs normal, and Lost Communication With TCM occurs after turn off the engine and turn on again. Also Transsmission Overtemp, Service 4WD and Service Park assist on dash. I can wait 10 minutes or unpplug negative from battery, after that everything is ok. Anyone had similar? 4.7 2005
Same problem. Exactly. 2006 grand cherokee 4.7, 4wd. 5 speed auto. I switched all the relays in the engine compartment around hoping something else would stop working. Everything still works. Even limp mode. No relays under the dash, just fuses and breakers. All connections are clean and tight. No apparent harness damage. I have replaced the trans pressure sensor.
The dealer said my pcm was fine. A $500 diagnosis. Offered to rebuild my trans for $6000. Yea right... 2 other mechanics said it was the pcm. $150 ea. Estimate. P1603 & P0700. I'm stumped... Any help is much appreciated.
The dealer said my pcm was fine. A $500 diagnosis. Offered to rebuild my trans for $6000. Yea right... 2 other mechanics said it was the pcm. $150 ea. Estimate. P1603 & P0700. I'm stumped... Any help is much appreciated.
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