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Hello there,


I have a 2015 VW Passat TDI SE 2.0 VIN# 1VWBV7A39FC024779 that was in a front end collision. Damaged the J743 Mechatronic connector, wiring, and transmission oil pan. My friend had a 2012 Passat with VIN# 1VWCM7A37CC026274 with 134K miles that had a “good” mechatronic unit, wiring and transmission oil pan, so I purchased from him, removed parts, cut the wiring and spliced it onto mine.

At the time, it seemed everything is interchangeable so I did so. Unfortunately before I did the swap I didn't know I needed to copy coding from it before removing, but I wouldn't be able to do that even if I could as the connector for mechatronics was damaged anyway.

Mechatronic unit from my car is: 02E927770AL
Mechatronic unit from parts car: 02E927770AL


After installing, I get code 19143:004 / Unexpected Mechanical Gear Disengagement – No Signal/Communication. I try to do Basic Settings & Adaptation with Autel Maxisys Scanner. Basic Settings Completed, Adaptation cannot complete, will not go further than 1st gear, and when transmission is warm, will not go into reverse. Get the blinking PRND light on the dash.

Checked the oil level via repair manual and that is correct.

Mechatronic, Connector, and PINOUT Images - Here you can see all the attached images I used for diagram and my part numbers

I assumed maybe when I repaired wiring and installed connector from parts car, maybe it is different from mine, and used ProDemand/Identifix to look at Pin Locations, removed all PIN’s and placed in what spots/by color wiring where it should be. (But stupidly did not take a picture before I removed them) Now I have no communication with TCM. Looks like wiring diagram/pinouts are not correct or I did something wrong, original pin connection had no problem outside of the DTC. Above is the link to the VW Diagram for Mechatronic Connector. Another problem is PIN 17 does not exist on the schematic, but for my car it is “P-N Output to Vehicle electrical system control module” so I put it where I saw others had theirs on the internet and that didn't work because I could not really find a clear picture.

Does anyone have a picture of front/rear of their mechatronic connector so I can place the pins in the correct spot?

Also, is the used Mechatronic unit compatible but because of high mileage (134k miles) may be already bad to begin with? Did I just need software update or should I buy another Mechatronic unit? How to I figure out my original pin connections to Mechatronic unit?

If I do just need to update software for mechatronic unit, can this be done with ODIS offline with the correct files? If so how do I do this? Or can I do it with my Autel Maxisys scanner that has current subscription?

Anyone can help I am willing to pay to resolve this. Thank you.