RNM1021

I bought this 2016 GMC sierra 1500 SLT back in late Aug 2025. Had home for two weeks and message "Right Rear Turn Indicator Failure". So i check taillight and thought it was bulb. Went to Auto parts store and got a bulb. Guy at store said he put in, OK i said. Pulled the taillight and then he said you got a problem, your taillight is LED. So i bought back to Dealer i bought from. They had do some work on it like paint front of it, and other stuff. so i told them and they say they will fix it. Pick up the truck and it taillight was working. got halfway home AND IT did again. so i been living with all this months. I replace wire harness and new taillights. Still doing it. What else can i try. check all Fuses and there good.