Knowledgebase: Support > PCM/TCM
2017+ GM T87a 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:

We also now offer Modified T87A's to be purchased directly for $399.99. For more information see the following link:
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