Hey Peter T,
It was one of the issues with my wrangler 2012... sadly the dealer didn't believe me the first time, they said if we can't see it or hear it it's not there and not like it happened only once but sometimes twice a week. Than the second they said they've reset the computer... seemed to work for a while but 3 month later it did it again only once....
Mainly it would happen if I used my right signal... with the lights on.
Hope it helps!
Oh nooo! there's the asphalt!!
~2013 Jeep Wrangler Unlimited Sahara~