I have an LBZ from a 2006 Sierra 2500HD swapped into a Hummer. It is currently tuned with a DSP5. Because I can't leave well enough alone I'm thinking of trying my hand at tuning, I already have a FlashScan and spare TCM. I'm trying to find an ECM so that I can leave my current setup alone. What I'm confused about is the current ECM is part number 12606126 and it says YNAX. I've been looking and these seem nearly impossible to find. I have found a bunch of 12606127 YNAY. Would I be able to use the YNAY version? What is the difference?
If this has been answered please feel free to point me in the right direction and then flame away.
If this has been answered please feel free to point me in the right direction and then flame away.
