Lost communication with TCM..

[Mr.obryant29]

So I'm having issues with my 2006 explorer, it has lost communication with the TCM so im only able to drive in limp mode. I've paid my local ford dealer 300 already to flash and update everything, but still having the issue. What could be the cause of this..? 2006 explorer 4.6l 3v with 6r60 trans.

 

[06EBMG]

Could be any number of things causing the issue. First thing that comes to mind would be CAN line issues. CAN lines are what allow all of the various modules on the truck to talk to each other. Could also be an issue with the TCM itself, though if the Ford dealer was able to program it that seems un-likely. Loose connection at the TCM?

 

[Mr.obryant29]

Could be any number of things causing the issue. First thing that comes to mind would be CAN line issues. CAN lines are what allow all of the various modules on the truck to talk to each other. Could also be an issue with the TCM itself, though if the Ford dealer was able to program it that seems un-likely. Loose connection at the TCM?

Could be any number of things causing the issue. First thing that comes to mind would be CAN line issues. CAN lines are what allow all of the various modules on the truck to talk to each other. Could also be an issue with the TCM itself, though if the Ford dealer was able to program it that seems un-likely. Loose connection at the TCM?

I hooked it to my scanner and it says no can message received from pcm but it has received one from the tcm...

 

[Explorer_PL]

My 06 v8 was loosing communication with TCM and going into limp mode.
I replaced the Mechatronic assembly with no luck.
Then I read an article on the web about exactly same symptoms and the solution was new spark plugs and coils.
The TCM harness runs on top of #3 and 4 coils and when they are bad, they mess with the signal.

I replaced the coils and spark plugs and had that problem again.

 

[Mr.obryant29]

My 06 v8 was loosing communication with TCM and going into limp mode.
I replaced the Mechatronic assembly with no luck.
Then I read an article on the web about exactly same symptoms and the solution was new spark plugs and coils.
The TCM harness runs on top of #3 and 4 coils and when they are bad, they mess with the signal.

I replaced the coils and spark plugs and had that problem again.

I've done all of that, even checked all of the wires and still no luck..

 

[06EBMG]

I hooked it to my scanner and it says no can message received from pcm but it has received one from the tcm...

So, the PCM is telling you that it "sees" the TCM. However, the TCM is not "seeing" the PCM. Between all of the different modules, the first thing that happens is a "handshake". This is when the modules agree that they see each other. It sounds like you have an issue with the datalink wires. Specifically, the CAN wires that run throughout the truck and carry data from one module to the next, so that they all know what the other one is doing while telling the other modules/PCM what they are doing. I am not very familiar with the 6r60 transmission, but I would think that the TCM is integrated into it? If not then I would find out the location of the TCM and start looking at the connector going into it. I am sure someone on here has had an issue with the TCM on their truck, so I would do a search for 6R60 issues and see what comes up. The can lines will be wrapped around each other in a spiral fashion. This is to prevent electrical interference from other wiring in the harness. If you do not find an issue there then the issue is going to be somewhere in the chassis harness of the truck. Most CAN lines run 2.3 (low speed) and 2.7 volts (high speed) on each line/wire at 60 ohms of resistance. So, assuming both lines are good you should see 5 volts DC and 60 ohms of resistance. They achieve this via 2 120ohm resistors wired into the lines at each end of the harness. These are called terminators.
This is where the true technicians out there earn the money. If you are good with a DVOM, patient, and want to do a little research into the harnesses on these trucks you should be able to find your problem. There are plenty of "rub" points located throughout a chassis harness that can cause issues. It is also possible that the TCM itself has an issue internally and is unable to complete the circuit. If not, I would suggest you start calling around and find a good tech who can diagnose your problem.
Hope this helps.

 

[Explorer_PL]

The TCM is attached to the valve body. One of the weak points is the round TCM connector sleeve.
See the pix in this post.

My 6R60 mechatronic replacement - saga continues, pictures..