BMW X7 ABS Light On, Speed Sensor Problems?

Hi there! I can relate as I had a similar issue with my 2021 BMW X5 last year (I've got some experience working on cars but nothing too advanced). The symptoms you're describing sound exactly like what I experienced. Initially thought it was a sensor too, but after taking it to my trusted workshop, it turned out the ABS control unit itself was defective. It was giving false readings and messing with the whole traction system. The fix wasn't cheap, cost me about 1000 Euro for the new unit and programming work, but it solved the problem completely. No more warning lights or jerky acceleration since then. Before I share more specific details, could you tell me if you're getting any specific error codes? Also, does the problem get worse when it's cold or after the car's been running for a while? This might help pinpoint if you're dealing with the same issue I had. By the way, my cousin has an X7 too, and these BMWs can be quite particular about their electronic systems. Better get it checked soon to avoid any safety issues.

Thanks for sharing your experience! My X7 is quite new with only 11834 KM on the clock and just had its latest service done. The problem actually started right after a cold morning, and yes, I am getting an error code. It's showing "ABS/DSC malfunction" on the display. What's interesting is that my symptoms match yours exactly, the jerky acceleration is particularly noticeable when I'm starting from a complete stop. It's definitely concerning since these are pretty expensive machines and you'd expect them to run smoothly. Did your mechanic mention anything about preventing this issue from recurring? I'm trying to decide whether to take it to the dealer or find a specialized BMW workshop. Since it's still under warranty, I'm leaning towards the dealer, but I'd love to know what to expect.

Hey again! Thanks for the extra details about your X7. You know what? That's exactly how mine started too, on a cold morning! And yeah, that "ABS/DSC malfunction" message is painfully familiar. Since you mentioned your car's still under warranty (mine wasn't anymore when I had the issue), definitely go to the dealer! Wish I still had that option when mine acted up. The thing with these newer BMWs is that their electronic systems are super complex, and the dealer has all the right diagnostic tools and latest software updates. When I had my control unit replaced, my mechanic actually mentioned that keeping the battery in good condition helps prevent these issues. Apparently, voltage fluctuations can sometimes mess with the ABS module. But honestly, with your low mileage and the car being so new, this sounds more like a potential manufacturing defect that the dealer should handle under warranty. One quick tip though, before you take it in, try to record a video of when the jerky acceleration happens (if you can safely do so). I did this with mine and it really helped the technicians understand exactly what was going on. Also make note of when it happens most, cold starts, specific speeds, etc. Keep us posted on what the dealer says. I'm really curious if it's the same control unit issue I had!

Thanks everyone for your input! After reading your replies, I feel much better about taking it to the dealer. You've definitely helped me understand what might be going on with my X7. I took your advice about documenting everything, made a video this morning showing the jerky acceleration and noted down that it's definitely worse during cold starts. I've got an appointment with the dealer next week, and since it's under warranty, hopefully, this won't hit my wallet too hard! It's really helpful to know about the potential ABS control unit issue you experienced. I'll make sure to mention this to the technicians, along with the error codes and symptoms. The similarity between our problems is striking, especially with how it all started on a cold morning. I'll definitely update this thread once I get the diagnosis and repair done. Thanks again for sharing your experiences, it's great to have such helpful community members who understand these specific BMW quirks!