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Knowledgebase : Support > PCM/TCM
Due to increased security, ALL GM  2017+ T87A TCMs need to be unlocked via the GM Unlock service before they can be tuned. More information on this new process can be found at he following link: https://www.hptuners.com/product/tcm-unlock-service/ [https:...
IF YOU HAVE PURCHASED THE TCM FOR A 2017+ CHEVROLET SILVERADO/GMC SIERRA 6.6L DURAMAX (L5P), PLEASE INSTALL THE TCM AT THIS TIME. THERE ARE NO ADDITIONAL STEPS TO BE COMPLETED. IF YOU PURCHASED THE TCM FOR ANY VEHICLE BESIDES A 2017+ CHEVROLET SILVERADO/...
Before installing your new L5P ECM, please read the following steps: Step 1: Download and install the latest VCM Suite 4.3 Beta available at www.hptuners.com/downloads Step 2: Perform the “Replace ECM” special function in VCM Scanner        1) Connect ...