HP Tuners Updates Support for GM T87A TCM
BUFFALO GROVE, IL, November 18th, 2025—HP Tuners is excited to announce a major update for GM transmission tuning—the T87A Transmission Control Module (TCM) no longer requires an upgrade service to enable tuning/diagnostics. This release removes the need for send-in upgrade services, allowing users to tune their T87A-equipped vehicles entirely through the OBDII port. The new […]


