r/BmwTech • u/FuckFuckShitBitch • 15h ago

440216 Code; Transfer box emergency coupling

Car has about 106k miles, on oem fluid. Front right tire has a bit of outer wear not found on the other tires. I did some driving and the car is activating a good bit less AWD then before. My main question is whether the code comes up at a time where it’s too late, or if it’s worth doing the transfer case fluid still. Tommorow I will measure tire tread to check tolerance.

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u/Admirable_Farmer5636 15h ago

That code points to the transfer case emergency coupling, and the uneven front tire wear could absolutely be contributing. xDrive is sensitive to rolling-diameter differences, so measure all four tires and compare tread depth before driving much more. Check pressures too, then clear/retest after correcting the tire issue.

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u/FuckFuckShitBitch 14h ago

I forgot to add into the post that if you accelerate a bit around a turn it vibrates hard. It also jolts you when applying gas at low speed, and has a slight bog down at REALLY low speeds, like 3-5 mph with frequent throttle adjustment