BMW 4 EV Trans Failure at 191K: Grinding Gears Horror

Hey there! I faced similar issues with my 2020 BMW iX3 last month. The symptoms match exactly what you're describing, unusual shifts, grinding noises, and warning lights. Turned out the transmission control module was defective, and it was seriously affecting the entire drivetrain system. Got it checked at the dealership, where they diagnosed an issue with the control unit's wiring and some damaged sensors. They had to replace the transmission control module and reprogram the system. It wasn't a quick fix, took them three days to sort it out completely. This isn't something you want to leave unattended. The grinding noise means there's likely already some mechanical stress on your transmission components. From my experience, I'd suggest getting it checked at a certified dealer since they have the proper diagnostic tools for electric BMWs. Just a heads up, this was definitely a serious repair job, not your regular maintenance stuff. Hope this helps with your decision.

Thanks for sharing your experience with the transmission issues. It's really helpful to hear from someone who went through the same problem. How much did you end up paying for the whole repair job? Also, has everything been running smoothly since the fix, or have you noticed any other quirks?

Hey again! Glad my previous response helped! Just wanted to update you, since getting it fixed, my BMW has been running like a dream. The gear shift indicator fault is completely gone, and the transmission is working perfectly smooth now. No more grinding sounds or unusual shifts, it's like having a new car again! About the cost, I ended up paying 1000 € for the repair. The main expense was replacing the defective control unit. Yeah, it wasn't cheap, but considering how crucial the transmission system is, especially in an electric BMW, it was worth every cent. Haven't noticed any other issues since the repair, which was about four weeks ago now. The car shifts exactly when it should, and all the warning lights have stayed off. I'd definitely recommend getting yours checked out soon, the peace of mind alone is worth it. If you need any other details about the repair process, just let me know. These high-tech electric vehicles can be tricky, but once you get the right fix, they're amazing to drive.

Thanks again for all the details! I actually took your advice and got my car checked out last week. The mechanic found similar issues with the control module, but also discovered some worn-out sensors that needed replacement. The whole thing cost me around 1200 €, a bit more than yours since they had to replace extra parts. Have to say, even though I was nervous about finding a new mechanic, this guy really knew his stuff when it came to electric vehicles. He walked me through the entire process, showed me the faulty parts, and explained everything clearly. The repair took about four days total, but the results are fantastic. The car's running perfectly now, no more grinding sounds or unusual gear shifts. The warning light's gone too. Really glad I didn't wait any longer to get it fixed. Thanks for pushing me to take action on this, you probably saved me from bigger problems down the road!