Hey guys, I just swapped a LS3 and 6L90e into my Cutlass. I cant seem to get the vehicle speed to read on the scanner nor does the transmission shift out of first. I have the same transmission in my Cutlass with a LY6 before swapping in the LS3 and it worked perfectly. I believe I changed from the old ECM to the new one but it still doesn't work. Please help.