This problem comes and goes. Turn left, tap blinker to go left, starts to blink fine and then it blinks fast. Appears no bulbs out. Dealer couldn't find an issue when it was serviced on 6/22/2020. I have had this problem come and go since May 5 times. I left dealer from service on 6/23 with car and 5 minutes later warning came on and i drove back to dealer and didn't turn off car or blinker so they could see it. They drove it back to service who videoed it and sent problem supposedly to Cadillac as there are no TSB's. They think they will be ordering a new expensive headlight assembly. How can a brand new car have this kind of problem!