I currently have an A40 installed in my 07 LBZ. Previous owner of the truck had purchased a new TCM he intended to send off for tuning and included it with the truck. New TCM is an A46 P/N 24256864. I connected it to the truck and when you use the auto detect function in V8, the TCM does not show. However, if you right click and select A40, it will connect and read out the TCM and shows the TCM has a base file installed. I updated the vin in the new TCM and cal flashed it, but it is still not communicating with the truck. P0602 code shows up saying the TCM is not programed. What am I missing? How do you prepare the TCM using EFILive? I do have my original A40 stock file, but I assume since the OS is different it will not simply flash over.
Thank you in advance!