"PROG" sign on Dashboard

[Kris@modmynav]

Hello,

I recently disconnect/reconnect Nav computer and Display unit,
after that whenever I turn on the engine, I see "PROG" sign on dashboard,
however it just goes away after few seconds then back to normal.
usually shows time first, but now it's like "PROG" then time.
I couldn't find anything wrong with my nav system either.
already checked manual, there are "Trans. Failsafe Prog" and "Engine Failsafe Prog"
but I only see "PROG"

what's that "PROG" sign means?

Thank you guys!