I had that problem when I first bought my car. I think it's trying to tell you a turnsignal bulb is out, but it's not always that simple. In my case, it was a bad ground. I found out the problem was in one of my front parking light housings. 2 of the 3 screw holes were stripped, and it was pretty much dangling by the third. I put in another assembly, and I haven't had the problem since.
Mike