We fought with the dealership we purchased it from used and they basically did the work at cost because nobody would cover it. GM still says it is not a defect! My last GM vehicle, I can assure you.
Same thing happening with our 2015 Tahoe. Apparently the extended warranty states that it is not a defect even though neither headlight or turning signal works. About to go ballistic with Chevy and warranty company as I'm being told it will be $2,000.00 to replace!