I have a 2017 Impala premier and have had this same issue since I bought the car new. It's sporadic though. Didn't leak for quit a while, but had snow melt on the roof in the garage and got in the car and there was water that leaked down from the map light/controls again in to the cup holder. I have had it in to the dealer 4 times and they can't find the leak or clogs.. I think it's a design flaw. Shouldn't have to drive around with this for the rest of the life of car. Had an 2004 SS monte sunroof never leaked a drop. I have a case entered with GM. Thoughts or solutions?!
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