P/4 tip light flahes

[wikan]

have a tiptronic with indicator light flashing from whatever gear its in to 4.
Only does this if engine is running.
fluid is good, no codes/cel's, gear switch will make proper light display even when disconnected from shift cable and moved by hand.
car acts normal as long as in automatic, no manual mode available.
Am stumped and looking for advice on where to go next!
Please bring all suggestions- thanks in advance!