P1676 indicates that the Powertrain Control Module (PCM) has detected a malfunction in the data line between the Transmission Control Module (TCM) and the Engine Control Module (PCM). I don't see any connection to the Traction Control System. Factors that will set this code are opens or shorts in the data line, or a failed TCM or PCM. I recommend you find a Honda specialist, I can't tell you how to fix something like this, you would need a good familiarity with the vehicle and good diagnostic skills and experience.
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