It is probably some type of transmission code. Is there a check engine light on as well? If so, have that read.
I am not familiar with any Honda diagnostic codes but does the flashing have any type of pattern? For example, does it flash three times, take a short pause, and then flash four more times? That would probably be a code 34. Also, you may get several short flashes followed by several long flashes.
My GF’s old car had a transmission range sensor/neutral safety switch go out. The car went into limp mode and the gear indicator illuminated that it was in all gears, park, neutral, and reverse all at the same time. There was also a check engine light indicating the transmission range sensor was bad. It was a simple part to swap and all was well afterwards.