I filed a complaint with the NTSB... I have 52k miles on my 2015 Yukon XL Denali... taillight is temperamental. I can push on the plastic housing and the taillight will illuminate. I can then bump it and it will stay lit for a few minutes then go back out. Called the dealership and was quoted $850+ installed to replace the taillight. Its clearly an electrical fault... all the bulbs still illuminate when its on. Going to pull the taillight this weekend and check the connector. I thought it looked cool, but had no idea it would cost so much when it failed. I even have a comprehensive 100k warranty through Assurant (USAA), but it doesn't cover anything deemed "illumination", so I may be SOL.