I noticed last night that only my 3rd brake light is working. The outer brake lights are not. Brought it into my lot today and the bulbs are good and the fuse! I don't want to take it to the dealer so any suggestions on what this could be? Or what I could do to find the problem? Thanks

 

now the lights are back on again.......hmmm short i can see how GM is goin to treat this.....when i tell them they weren't working and now they are back on. they will think im crazy and not fix the problem i hate them

 

Maybe a short? Might want to check the bulb connections and where the taillight harness comes through the floor. Thats behind the sub, mine did the same thing..... the plastic that rappes around the wires came loose and rubed the wires so they were exposed. Easy fix tho..Electrical tape! just my 0.02

 

good idea thank u very much