I have the same problem with my 2017 Elantra left tail or break light stays on after car is off.
Had the junction fuse box replaced that help for about 3 months. Break switch is good this is kicking my butt.
what I’m I missing. Please Help! Carlos
I think you are missing a good mechanic that will fix your brake light problem .
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Your car is under the 5 year limited warranty.Go to the dealer.