BMW XM Warning Light Nightmare, Multiple Errors Persist

Hey there! I had a similar issue with my 2020 BMW X6 last year (I have some experience working on cars, but mostly basic maintenance stuff). Those multiple warning lights can be super annoying! My X7-owning friend actually referred me to his workshop after I dealt with similar symptoms. Turned out it was an undervoltage problem causing all those error codes to pop up. The workshop did a full diagnostic scan and found that the voltage supply was inconsistent, which was messing with various control units. Total repair cost me about 240 Euro, but it fixed the issue completely. Before I can share more specific details, could you tell me which warning lights exactly are showing up on your dash? Also, do you have access to the specific error codes? This would help determine if you're facing the same electrical gremlins I dealt with. Let me know these details and I'll try to help further!

Thanks for sharing your experience! Mine just hit 88050 KM and had its latest service three weeks ago. From what I understand, you had a voltage issue, that's interesting because my warning lights are pretty unusual, sometimes it's the drivetrain malfunction, other times it's the chassis system. The codes keep changing too, which makes it really tricky to diagnose. Did you notice any pattern with your warning lights before getting it fixed? Mine seem to pop up more frequently when starting the car in the morning. Also, did you try any basic troubleshooting before taking it to the workshop? Just wondering if I should attempt anything before booking a service appointment. Really appreciate your help with this!

Hey again! Yes, your symptoms sound eerily similar to what I experienced! My warning lights were also totally unusual, one day it'd be the drivetrain, then chassis, then even stuff like the tire pressure monitoring system. Super frustrating! And yes, the morning start-up thing! That was exactly my experience too. It was always worse when the car sat overnight, which actually makes sense now that we know it was voltage-related. The battery would drain slightly overnight, and the inconsistent voltage during start-up would trigger all sorts of false errors. Before taking it to the workshop, I tried disconnecting the battery for about 30 minutes to reset everything, that helped temporarily but the warnings came back within a few days. I also checked all the fuses, but they were fine. Honestly, I wish I'd just gone straight to the workshop instead of spending time troubleshooting, since it turned out to be a more complex electrical issue. Since you mentioned yours started after a recent service, might be worth checking if anything got disturbed during that work. In my case, they found that a control module wasn't getting consistent power, which was causing all the cascade of error messages. Let me know what you end up doing, really curious if it turns out to be the same issue as mine!

Thanks for the detailed follow-up! That's really helpful to know about the battery disconnect attempt, I was actually considering trying that myself. It's quite reassuring to hear that your symptoms match mine so closely, especially the morning start-up issues. I just called the service center and managed to get an appointment. You're probably right about getting it checked professionally rather than spending time on DIY troubleshooting. I did mention your voltage issue to them, and they seemed to think it could be something similar, especially given the unusual nature of the warnings. Just out of curiosity, after they fixed your voltage issue, did you have any recurring problems? I'd love to know if it was a one-and-done fix or if you needed any follow-up visits. I'll definitely update this thread once I get mine sorted out, might help others with similar issues. Thanks again for all your help with this!