BMW i5's ABS Warning Chaos: Speed Sensor Mystery

I had the exact same issue with my 2021 BMW iX last month. The diagnostic showed "Affected control unit defective" on the ABS module. Initially, the garage checked the wheel speed sensors, but they were fine. Turned out the ABS control unit itself was faulty and needed replacement. My car had similar symptoms, unusual ABS light, traction control engaging unnecessarily, and unstable brake pedal feel. It wasn't safe to drive like that, so I had it fixed right away. The repair involved replacing the entire ABS control module and reprogramming the new unit. This is actually a serious issue since it affects core safety systems. You shouldn't drive the car much until it's fixed because the ABS and stability control might not work properly when you really need them. Take it to an authorized BMW service center, they have the right diagnostic tools and programming equipment for these electronic modules. Generic shops often struggle with the newer BMW electrical systems.

Thanks for sharing your experience with the ABS module issue. That does sound exactly like what I'm dealing with. Quick question, do you remember roughly how much you ended up paying for the whole repair? Also, has everything been working smoothly since they fixed it? Just want to make sure I'm prepared for what's ahead with my i5 and that it's actually worth fixing rather than looking for other solutions.

Hey there! Yeah, happy to follow up about my iX repair. Great news, since getting it fixed at the BMW service center, all those annoying issues completely disappeared. The Speed signal fault that was causing all that trouble is totally sorted now. The traction control's working perfectly, and there hasn't been a single warning light since. About the cost, I ended up paying 1000 € to replace and reprogram that faulty ABS control unit. Not cheap, I know, but totally worth it for peace of mind. The car drives like new again, and honestly, when it comes to safety systems like ABS, I wouldn't think twice about getting it properly fixed. Definitely go for the repair, these BMWs are great cars when everything's working right, and you don't want to mess around with safety features. Plus, the alternative solutions might end up costing you more in the long run. Trust me, once it's fixed, you'll be glad you took care of it properly.

Well, I finally bit the bullet and took my i5 to a certified BMW service center. Turns out you were spot on, it was the ABS control module. The whole repair was pretty much exactly what you described, and I paid just a bit over what you mentioned. The mechanic was actually great this time. They explained everything, showed me the faulty part, and got it done within a day. What a relief to have this sorted! The car's running perfectly now, no more unusual traction control kicks or warning lights. It's crazy how one small module can cause so much trouble. Thanks again for your advice. You basically saved me from wasting time trying cheaper fixes that probably wouldn't have worked anyway. Sometimes you just have to accept that these high-tech cars need proper care, even if it costs a bit more. At least I can drive worry-free now!