Knowledgebase: Support > PCM/TCM
2017+ GM T87a 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  directly for $399.99

or send one in to be unlocked t
hrough HP Tuners TCM Unlock Services – GM T87A  for $199- $299

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