BMW 330xi AWD Issues, Transfer Case Warning Signs?

Hey there! Got some experience with BMWs, as I own a 2006 325i and previously had a 328i. I actually faced something very similar with my 325i. Had those exact symptoms, AWD light, rough shifting, and that annoying misfire feeling. Turned out my ABS module was acting up, which was causing these cascade issues with the transfer case and transmission signals. The good news? In my case, it was covered under an extended warranty recall for ABS module issues in that generation of BMWs. Got it fixed at no cost. The dealer reprogrammed the ABS module and cleared all the related fault codes. Car's been running smooth since then. Could you share what error code you're getting exactly? Also, when did these symptoms first start showing up? This info would help me confirm if you're dealing with the same issue I had.

Thanks for sharing your experience! My symptoms started about two weeks ago after my latest service. My car has 16923 KM on the clock, and I'm getting the error code P1774 (transfer case related). It's interesting you mention the ABS module because I've noticed the brake pedal feels a bit different too, though I didn't think to connect the dots. Did the ABS module replacement fix all your symptoms immediately, or did it take some time for everything to settle? I'm hoping it's something similar to what you experienced rather than a full transfer case replacement.

Hey again! Yeah, as I mentioned before with my 325i experience, the ABS module fix did resolve everything, but it wasn't instant. It actually took about 2-3 drives for the system to fully adapt and get back to normal. The brake pedal feel you mentioned is exactly what I experienced too, it's definitely a telltale sign of the ABS module acting up. The timing of your issues starting after a service is interesting though. I wonder if something got disturbed or reset during the service that's causing these symptoms. My issues started out of nowhere, but I've heard from other BMW owners that sometimes these problems can pop up after routine maintenance. Given that you're getting the P1774 code (which is the same one I had), and your symptoms match mine exactly, I'm even more convinced it's the ABS module. What's particularly interesting is that your mileage is relatively low at 16923 KM, which makes it even more likely to be an electronic/module issue rather than mechanical wear. Just a heads up, while waiting for the repair, try to drive smoothly and avoid any aggressive maneuvers. That's what I did to minimize stress on the system. Have you scheduled an appointment with your dealer yet? They should be able to check if your car falls under that same recall I mentioned.

Thanks for all the detailed info, especially about the progressive improvement after your ABS module fix! I actually just called my dealer after reading your response, and they confirmed my car is eligible for that ABS module recall. Got an appointment scheduled for next week. What you said about driving smoothly until then makes total sense, I've been babying it anyway since these issues started. Really hoping this fixes everything like it did for you. The fact that your symptoms were identical, right down to the same error code and brake pedal feel, makes me pretty optimistic. It's funny you mentioned the service timing because I was also wondering if something got knocked loose during my last maintenance. But if it's just the ABS module acting up, that explains everything. Really appreciate you taking the time to share your experience. I'll definitely update once I get it fixed. Fingers crossed it'll be the same straightforward fix you had!