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Message: <blockquote data-quote="Will_K" data-source="post: 21430" data-attributes="member: 7902">I'll just log my progress.Yesterday I went through some mostly futile diagnostic exercises because I was running out of ideas. I tried swapping back in my dashboard harness to see if anything was different. It didn't really change much, but in the process I discovered one connector I missed on the electric steering module.With that connector in place, now I get communication with all modules except for the TCU and PCM. The resistance check shows 120 ohms with the PCM disconnected so the rear resistor is showing up.As a side note, I have the fancy tablet T8 scan tool thing from harbor freight. I figured out how to get to the other modules in spite of no communication to the PCM. I have a new GM key fob I had bought and which they said I'd have to bring in the car so they could program it for $120. I was able to program the key fob myself.Today at lunch I thought I'd run to the junkyard and grab a TCM. This same tablet gives me the ability to reprogram vin numbers in modules (I believe - I found the functionality snooping around on another Jeep vehicle I have) I thought that it would be easy, it's just 3 screws right?Well, it's under the battery tray support bracket and one of the brackets holding that onto the structure is packaged so you can only get a box wrench on it. Great. So I had to work around that bracket. And then the screws for the TCU are 12 mm socket screws, and for the most part everything is otherwise either 13 mm or 10 mm, so I tried 13 mm and may have rounded some corners, so 1 screw wouldn't come off.I didn't have enough time to try another car, and the thinking was if I had the time I'd grab an engine harness - that obviously didn't happen but if I can get back before they crush out that row maybe I'll have a chance at having a head start on the removal. I just need to come back with a 13 mm box wrench apparently.</blockquote>

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