T87 file differences for 4 pin vs 10 pin connectors

[blackdog76]

I have a 2015 L86 8L90 combo in a swap car. I had to source my ECM and TCM from a 2015 Escalade. After sending them both off to my tuner and getting them tuned (including having the TUN flashed from the sticker on my trans) it's stuck in neutral, just free revs.

I'm getting a P18C2 code which will also set off a P0700 code. The P18C2 code is a PRNDL code. My tuner says it's not even an active code with my OS so something is definitely wrong there. HP Tuners will also not allow me to do a fast learn.

When I shift I get an error listed by HP Tuners as unknown 81 and unknown 82 listed in the drive gears under PRNDL status.

There are a few threads on here with this problem but no solutions that were posted.

There are two different PRNDL harnesses in 2014-2016, some 2 piece and some 1 piece. I have the 2 piece 10 pin and I think what's happening, is the program in my T87 is a 4 pin.

Is there any way to verify that?

I'll post the tune.

Camaro0328 Retune (1).hpt

[blackdog76]

I emailed Bill and he said he didn't know what the 81 82 error codes meant. I'm going to try to adjust the shifter and see if anything changes as far as the shifter errors.

[blackdog76]

Also here is a Bulletin from GM talking about the differences in internal harnesses.

https://static.nhtsa.gov/odi/tsbs/20...71294-9999.pdf

[vet57air]

So I have a similar problem. I have a connect and cruise LT4 and 8L90 crate that is installed in my 66 C10. Put 500 miles on it last fall and first time I took it out this spring I put my foot into it and it rev'd and not several times and got check engine with those codes Po700 and P18C2 (pending). Anyone else have issues? Also most 8L90 trans have a PRNDM shift pattern. Mine and two others I know have 6 shifter positions, could be PRNDML ??

[COPO2014]

How did you rectify this? I am having something similar going on