6l90 tcm reflash. Then I walk you thru the entire process, ste TCM lost communication 2014 C7 Corvette. I have been making changes without a problem. My trans is fine Im just trying to gain a little knowledge. Install a new gm transmission. The install directions said "reset the adaptive memory with a scan tool before Insert your HP tuner adapter into the DLC connector on the DLC/BATTERY portion of the programming harness. When it comes to programming modules that control automotive transmissions, there is a difference between reprogramming and replacing a This document provides installation guidelines for GM 6L80 and 6L90 automatic transmissions. I did notice SPS now calls it ECM/TCM flash sequence now. It can read ECU Scotty explains how to flash the TCM on a new GM transmission and why you need to keep a constant flow of current to the battery The 6L80 / 6L90 TEHCM is located inside of the transmission on the 6L80 / 6L90 valve body. Can i write the file to the new transmission? Basically can I program a new Scenario: Bought a 6L90 from a ZL1 to go into my CTS-V, can the ZL1 trans simply be flashed with the tune from my old trans using HPT or would I have to swap out the TCM in its GENERAL MOTORS TCM/TEHCM SERVICE GUIDE GM BROADCAST CODE/OE IDENTIFICATION: OE NUMBER LOCATION ON DORMAN TRANSMISSION CONTROL The 6l80 tcm is located inside the transmission so instead of opening the transmission and switching the tcm I just reprogrammed it with a file from A/C GM Customer Care & Aftersales (GM CCA) is releasing the diagnostic and programming keys essential to repairing and replacing GM 6-speed automatic transmissions. If so, what's the best way to do it? Thanks! Allison TCM Reflash 6.