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Swapped 2008 LY6 and 6L80 into 2006 LJ. I used the harness and ECM from the 08 Chevy. How can I get a crank signal to the ECM with no body module?

Tried that. Didn?t do anything. I?ll pull the pan off tomorrow and see if something got hooked up wrong.

Its connected. Speed reads 158mph. I did have a need output shaft installed in the transmission. Maybe something got screwed up then.

So does it read through the BCM? I pulled harness and ECM out the truck not the BCM

It did not read the TCM. It?s an 08 GMC LY6. TCM and ECM are the same.

I dont have the anything in the OS menu. When reading the vehicle it also brings up manual transmission so its not seeing the 6L80. Any ideas?