rallysport096

So it was pin 14, not 13. Regardless, I replaced the techm and the truck talked to the computer. Reprogrammed, went through the shifting procedures, truck drives great. So what does pin 14 do?

I'll take a look at it. Thank you so much for your help!

So that was something I checked, and I can see there's no pin for #13, but it's not bent nor does it look like it broke off. I can't tell if there was even a pin to begin with. Theres a wire in the pin 13 spot on the harness. Maybe it was a clean break?

So back in March, a family friend and I rebuilt my 6L80 in my 2015 Sierra. I had taken it out, rebuilt it with him, put it back in, reprogrammed the TCM and such, truck runs great. While I was without my truck, my Dad so graciously lent me his 2015 Sierra to borrow while I was working on mine. His had the same issue though (bad lockup in the tc/bad tc). Once mine was done, I decided to rebuild his. Disconnected the battery, took the trans out, overhauled it, put it back in the truck, reconnected the battery, went to reprogram the truck, and it would not show up on the reader (ACDelco Techlink with MDI). Would not populate the VIN. MDI would not read the truck. Checked the program on my Sierra, the MDI and software are fine. Back to my Dad's truck, as I turned the key on when I initially plugged the MDI in, I received the following messages in the dash: - Action Required: Steering Assist is Reduced Drive with Care - Fuel Level Low (gauge shows empty, but I know I had gas when I parked it) - Service Stabilitrak - Service Trailer Brake System - Automatic Light Control On (This one popped up as I am writing this post... so new?) In addition: - The PRNDM don't have a red highlight (no shift indication) - The shifter doesn't have the safety lock engaged (where you have to press the brake to shift) - It won't start My initial worry was, "Man, I f****d up the techm somehow." But, can the techm cause all of this? The battery is a bit low (12.03V), but I've had it worse in my truck and nothing like this ever happened. Stabilitrak, for sure, but nothing else. Finally thought to connect my VerusD10 scanner, after waiting the 10 mins to start WinXP, it got through to give me the U0100 and U0101 codes.... Any ideas? Thanks!

Did you ever get this figured out?

@pgamboa Phil, did you ever get it figured out? Thanks!