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Old 09-04-2019, 05:49 AM
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2012 JK Lost communication with all modules

Hi all, I have a 2012 JK doing around 149K kilometers stock except for the bumpers, fenders and tires (285/70/17). I’m facing an issue, where suddenly all the lamps on the dashboard turns on, the rpm gauge and temperature gauge falls down although I’m driving and the fan starts at the highest speed and very loud and the transmission doesn’t function properly when this issue happens. This started happening a year ago, not very frequent though like once every 5K kilometers. When I turn the ignition off and on again. Everything is fine except for the check engine lamp that remains on for a couple of days then goes off automatically. I’ve had the car checked at a couple of service centers and they found the vehicle storing lots of lost communication errors more than 20 such as lost communication with BCM, TCM and PCM. Both advised that this is a wiring issue and (plugs) apologies I don’t know the technical name for it and both had them all checked, cleaned and revised and had all the errors deleted. One also advised that this is due the BCM and needs to be replaced. The car keeps doing the same issue and still not very frequent however, no it refuses to start whenever I stop the Ignition and start it again. Also when the issue happens i used to stop and start the car and keep driving now when i stop and start the car the issue either keeps happening like 10 times repeatedly or refuses to start, then it starts and drive with the check engine lamp on for a couple of days knowing that the errors are all lost communication. What I noticed is there’s no specific condition that triggers the issue. It started happening while driving. Sometimes when I start the car for the first time at the day. I don’t think it’s the BCM coz I believe it a spare part is broken, the issue would remain forever and won’t pop up every now and then. Sorry for the long post and not know some technical terms. Appreciate ur help.

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Old 09-04-2019, 09:17 AM   #2
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You need to find a mechanic that is skilled at troubleshooting network BUS issues. This sounds like to me either you have a module that is failing and bringing down the CAN BUS (or other network line) or you have a wiring shorting causing the BUS line to go out.

I have watched some videos on how to troubleshoot and it usually involves using an oscilloscope tapped into the network lines so you can see the network packets communicating on the line. Then as the failure happens you see the packets malform. Then you unplug modules until you see the network come back. If the module is causing the problem you look at the module and verify it's health. If the network doesn't come back, it's look at wiring.

Seems many mechanics are not specialized at this. Also it can be time consuming depending on how deep a technician has to go to find the problem. Certainly more complicated than changing brake pads.

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Old 09-04-2019, 10:10 AM   #3
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Given that the 'Totally Integrated Power Module' is known to fail and given that this is one common point where all modules meet, I would have this module rebuilt first, before I even start trouble shooting. Check out this company: www.tipmrebuilders.com
There might be others who offer the same services.
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Old 09-04-2019, 10:39 AM   #4
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Quote:
Originally Posted by Wrangleur View Post
Given that the 'Totally Integrated Power Module' is known to fail and given that this is one common point where all modules meet, I would have this module rebuilt first, before I even start trouble shooting. Check out this company: www.tipmrebuilders.com
There might be others who offer the same services.
Really? From what I understand, the TIPM issues are generally with relays going bad within the TIPM. The issue going on here is a communications network problem not relays being stuck on or stuck off.

Now I am not going to say it's not the TIPM but I would diagnose first and repair second.
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Old 09-04-2019, 10:44 AM   #5
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I had a similar issue with my 2014, although it sent it into limp mode and gave a hotoil error as well.

The dealership found moisture in a couple of connectors, they added dielectric grease to them and I haven't had any issues in 50k+ miles since then. Despite me asking several times, they never specified which connectors.


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Old 09-04-2019, 11:20 AM   #6
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Really? From what I understand, the TIPM issues are generally with relays going bad within the TIPM.
I have no first hand experience with rebuilding the TIPM, but YES, going by the information that is available on the net, there is much more involved with TIPM issues than just relays!
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Old 09-04-2019, 03:42 PM   #7
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Agreed with all the above but bad grounds can cause this type of behavior. Iíd check the grounds to the tipm, and the rest as well.


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Old 01-21-2020, 01:56 PM   #8
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2012 JK Lost communication with all modules

did you ever find out what was the actual cause of your problem as i am experiencing the same thing
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Old 01-21-2020, 03:43 PM   #9
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Quote:
Originally Posted by IElFakahany View Post
Hi all, I have a 2012 JK doing around 149K kilometers stock except for the bumpers, fenders and tires (285/70/17). Iím facing an issue, where suddenly all the lamps on the dashboard turns on, the rpm gauge and temperature gauge falls down although Iím driving and the fan starts at the highest speed and very loud and the transmission doesnít function properly when this issue happens. This started happening a year ago, not very frequent though like once every 5K kilometers. When I turn the ignition off and on again. Everything is fine except for the check engine lamp that remains on for a couple of days then goes off automatically. Iíve had the car checked at a couple of service centers and they found the vehicle storing lots of lost communication errors more than 20 such as lost communication with BCM, TCM and PCM. Both advised that this is a wiring issue and (plugs) apologies I donít know the technical name for it and both had them all checked, cleaned and revised and had all the errors deleted. One also advised that this is due the BCM and needs to be replaced. The car keeps doing the same issue and still not very frequent however, no it refuses to start whenever I stop the Ignition and start it again. Also when the issue happens i used to stop and start the car and keep driving now when i stop and start the car the issue either keeps happening like 10 times repeatedly or refuses to start, then it starts and drive with the check engine lamp on for a couple of days knowing that the errors are all lost communication. What I noticed is thereís no specific condition that triggers the issue. It started happening while driving. Sometimes when I start the car for the first time at the day. I donít think itís the BCM coz I believe it a spare part is broken, the issue would remain forever and wonít pop up every now and then. Sorry for the long post and not know some technical terms. Appreciate ur help.
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Old 01-21-2020, 03:44 PM   #10
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did you ever find out what was the actual cause of your problem as i am experiencing the same thing
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Old 01-22-2020, 03:45 AM
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Hi Guys, I've finally figured this out and had my car repaired. I'll try to explain as much as i can, but please forgive my poor technical background.
The issue with my car was the clock spring. So here what usually used to happen. I used to face the above error or malfunction either out of the below, or whenever i use the turn signal to the right (in this case i would usually get the traction sign on first, then within a couple of minuets i incur the malfunction (lost communication with all modules and all signs on the dash board turn on) i also used to face the same issue if i drive over a bump or a crack in the road. So it turned out to be that my clock spring is malfunction. The technician diagnosed as follows: whenever the clock spring tries to function and send data through the CAN C network, it causes all the network to crash. Therefore, all modules lose communication to each other. I had the clock spring replaced and been driving now for almost 4 months and the car runs perfect. Hope this might help any of you..
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