I understand this is an old post but I couldn't find any others dealing with the 2018 Traverse tail light. I purchased my 2018 Traverse early on in Sept 2017 in central Illinois, small dealership. Last night my neighbor noticed my passenger rear outer tail light was burnt out. I since have moved to Florida but today I called the dealer I bought it from Baum Chevrolet in Clinton, Illinois. Unfortunately the sevice manager told me the tail light assembly was covered under the original 3 year warranty which expired 5 weeks ago. He did however say there was a TSB (17-NA-347) for the 2018-2020 Traverse tail light harness. Owners reported either the light going out completely or problems with the turn signal flashing rapidly. I plan to call the Estero Chevrolet dealer tomorrow to see what I need to do.