Passenger side hyper flash with stock bulbs

Could use a bit of advice / help — out for a drive today and the passenger side blinker started hyper flashing. Headlights and turn signals are all stock. I did install LED interior lights (footwell, vanity, map, etc) several months ago, but have never had an issue since, so I doubt it has anything to do with that. Driver side is perfectly fine, it’s just the passenger side. Any thoughts on where to start diagnosing the issue?

 

I would start by removing the bulbs from the front and rear blinkers on that side one at a time and see if it hyper flashes on one but not the other. May give you a starting point.

 

Check for a burned out bulb.

 

+1....a burned out bulb or filament in the bulb.

 

Sounds like it’s time to swap to LED and add resistors...

 

My driver's side was doing this, made me think a bulb was out in the rear. I took the tail light off, pulled the bulb out, blew on it and the socket (the proper way to refurbish any light bulb ) and put it back in nice and firm. Haven't had a problem since, it's been months.