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Knowledgebase : Support > PCM/TCM
Due to increased OEM security all GM  2017+ T87A TCMs need to be unlocked before they are able to be tuned. You can Purchase a Modified T87A [https://www.hptuners.com/product/new-gm-unlocked-t87a-tcms/]  directly for $399.99 or send one in to be unlock...
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 OR ZR1 ECM, PLEASE READ THE FOLLOWING STEPS: STEP 1: Download and install the latest VCM Suite Beta [http://files.hptuners.com/VCM%20Suite/VCM%20Suite%20(Beta).msi] STEP 2: Perform the “Replace ECM” special function in VCM ...