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Dealing with this on my 2013 X5M right now. I haven't fixed the leak yet, but it got inches of water in the back, including both sides and the battery area. I replaced the hatch lift box (module) and the Transfer Case Control Module (one Chinese new version and the ATC used from salvage)...managed to fix all the codes/dash light and hatch luckily. Now I have to find the leaks. Good luck. I'll update what I find on the source of the leak. But for now happy to have all electrical faults cleared.
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