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I am also having this specific issue on my 2015 M3 with 52k miles.
No CEL, but I saw this hidden code from BM3 diagnostic page.
When I checked coolant it was totally empty.
I filled up full, but it would slowly decrease every week when I check it.
I am pretty sure that I have slow leak somewhere inside intercooler as I do not see any leak coming from radiator as the poster right above me.
I ordered replacement intercooler and will be replacing it myself when it arrives.
It seems pretty easy to replace this from online video I saw.
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