Hey yall. I got. 2016 3500 with a Duramax. Having an odd issue that started the other night. My left blinker won’t work, when my headlights are on while I do it auto or manually the blinker indicator on my left mirror stays on (as I showed in the picture). The blinker will not work in the light but the 4 ways do. I checked all the grounds at the bottom of the radiator, under the driver door and under the passenger door. I also checked all the BCM fuses in the truck and they’re all good. Also, the first 3 blinks are normal then it goes into hyperflash. Any one have any ideas?