Sorry, can't help. Have never had a vehicle with HID headlights before. It's an arc type and has a ballast. Would think the ballast would be the weak link. "Bulb" should be good for 10,000 hours.
Would hope the bumper to bumper warranty would cover it.Dealer should be reasonably expected to fix this under warranty . . . Wouldn’t you think?
Wow, would think that's the first thing they would have tried.GM recommends change the HID bulb itself.