BMW 8 Series: Jerking Issues & AWD System Problems

Hey there! I have some experience working on cars and had a very similar issue with my 2016 BMW 7 diesel last year. The symptoms you're describing sound exactly like what I experienced, jerking at constant speeds and transmission acting up. Took it to my regular workshop where they diagnosed a problem with defective gears in the transfer case. The whole repair, including parts and labor, cost me around 330 Euro. Since then, my 7 Series has been running smoothly with no issues. Can you share more details about when these symptoms started and if you've noticed any specific conditions when they occur more frequently? This would help confirm if we're dealing with the same problem. If it's indeed the transfer case, I'd recommend getting it checked soon to prevent more extensive damage. My mechanic explained that these issues can get worse pretty quickly if left unattended. Just curious, have you noticed any unusual noises along with the jerking?

Thanks for sharing your experience! I'm at 142590 KM and had my last service about 3 months ago. The jerking started pretty recently, maybe 2-3 weeks ago. And yes, actually there's a whining noise when accelerating, especially noticeable between 60-80 speed. My car's been solid until now, but these symptoms are getting more frequent. The error messages pop up more during longer drives. I'm planning to take it to the workshop next week, hoping it won't cost an arm and a leg. Your insight about the transfer case definitely helps narrow down the possible causes.

Hey again! Yeah, that whining noise you mentioned really confirms my suspicions about the transfer case. My 7 Series had the exact same symptoms at around 138000 KM, that whining noise was what eventually led my mechanic straight to the problem. I remember being worried about the cost too, but honestly, getting it fixed early saved me from bigger issues down the line. The whining in my case got way worse during cold weather, and the jerking was most noticeable on highway drives. Did you notice anything similar? After my repair, I actually started checking the transfer case oil more regularly, about every 30000 KM now. Haven't had any issues since. Might be worth asking your workshop about setting up a similar maintenance schedule once they fix it. Also, quick tip from my experience, make sure they check the surrounding components too. When my transfer case was acting up, it had started to affect the driveshaft seals as well. Caught that early enough, thankfully. Keep us posted about what your workshop finds. Always interested to hear how these issues work out for others with similar BMWs!

Thanks so much for all the detailed info! Yeah, now that you mention it, I've noticed the jerking is definitely worse on longer highway trips. My morning commute is pretty short, so that's probably why I didn't catch it earlier. That's really helpful about the driveshaft seals too, I'll make sure to mention that when I take it in. Good call on the regular transfer case oil checks, I honestly hadn't thought about that before. I'll definitely add that to my maintenance routine once this is sorted. I've booked it in for next Tuesday, and I'm feeling a bit more confident now knowing what to expect. It's such a relief to hear from someone who's dealt with the same thing. I'll update the thread once I get the diagnosis and repair done. Really appreciate you taking the time to share your experience, it's been super helpful!