2011 Equinox lt 2.4l No com with PCM, TCM and Power Sterring module

Hello everybody, my name is David and I have a problem maybe you guys can help.

2011 Chevy Equinox LT/LS 4Cyl A/T FWD With 60k

Customer found him self on limp mode (4Th and reverse) on a long trip, tried to make it home and after driving it for almost 1.5hrs trasmission quit, had to towed over 50 miles to his house.

I went and ck it out and found what it seem like a bad converter but also no information with the fourth gear at all. No information of fluid psi and no solenoid control at all.

Got a used transmission with (60k) and had a friend with shop access to install it.

First issue, no start!

Under another friend advise without checking anything I removed the TCM and installed the original one.

Still same issue (no crank, no start) so I started checking and found no comm with PCM, TCM and Power Steering Module. I also loose power to the IC when I try cranking (it turns completely off).

I started with basic checks and found that when R&R tranny only had to disconect a couple of body grounds which seem ok. I dont remember if I checked them electrically but I will go back and do just to be sure.
Pcm has all its powers and grounds and feeds all 5V ref circuits, there is communication coming out of the PCM in pins 39 and 40 of the Black connector and wake up signal to the other modules (used a Modis to see the signal) ans it's nice and clean.

My problem is that I am not very well verse with can systems and I feel that I dont have a good idea what am looking for, am lost and maybe I can get some guidance to understand the system better so I can diagnose it. I have ordered the GM service manual for the vehicle but it will get here next Monday and this Friday makes 2 weeks that I started working in this vehicle. All parties involved are obviously loosing their patients and I have considered given the vehicle back to the customer but I dont want to give up and cannt afford such a financial blunder. I know this is besides the point but hopefully I can get some guidance and learn something at the same time.

Please help!

Did you ever find the solution? I’m in the exact same situation. And the three of us are going crazy trying to figure it out.

I recently had a 2004 Holden Ventura [GM based I think] which the customer had a good go at. Measuring the resistance of the two CAN wires gave me 120 ohm. It should be 60 because there is a 120 ohm terminating resistor in the PCM and one in the ABS module. First off, check the resistance of your CAN wires. Eventually I traced the CAN wires to a plug on the steering column, possibly for SAS. There were 4 CAN wires that would join at whatever was unplugged. I connect the two brown wires together and the two brown'/black wires which joined them all together and gave me 60 ohm and allowed communication between, and to, all the modules.
The bad news is that the customer had a good go at it himself and there was a pile of modules on the back seat, two blown PCM module amongst all the other modules. I could communicate with the $500 remanufactured PCM but it wouldn't code to the vehicle. We got a full set PCM/PIM/A/T and BCM/ign key kit and fitted it and it started and ran for 30 seconds before blowing that PCM.
Anyway, besides my rambling, check the resistance first