Tesla Model Y owners have complained about water leaking into the rear trunk for a while, with dozens of cars affected. Tesla finally acknowledged the problem and issued a Service Bulletin to address it. The fix involves resealing the liftgate assembly, hopefully with a better sealant.
Water ingress can be a nasty problem, especially if you have a lot of rain in your area. If you don't discover it and fix it quickly, the water can cause mold to grow, leading to a bad odor inside the car. The problems can affect all vehicle makes. Last year, GMC issued a Service Bulletin for the Hummer EV, which was affected by a similar issue. The water was leaking inside the cabin through the A-pillar area because of a sealant issue, and the fix was filling the space with silicon sealant.
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