BMW M4 Convertible Top Stuck, Sunroof Error Fix Help

Hey there! I had a similar issue with my 2019 BMW M2 Competition last winter. The sunroof completely froze up with the same error message you're describing. Turned out the initialization system had failed, and the control module needed reprogramming. Took it to the dealership, and they performed a full diagnostic scan. The issue was that the sunroof control unit had lost its reference points. They had to do a complete coding reset of the comfort access system and reprogram the module. It wasn't just a simple reset, they also found that one of the sensors had gone bad, which was causing the initialization failure. It's actually a fairly serious issue that needs proper diagnosis and repair. If left unfixed, it can potentially damage the entire roof mechanism. In my case, they also had to replace a faulty motor that was causing the system to misread its position. Don't try any DIY fixes on this one, these systems are too complex and interconnected with other vehicle functions. Best to get it properly diagnosed by someone who knows BMW electronics.

Thanks for sharing that, totally spot on with what I'm experiencing! Quick question: do you remember roughly how much you ended up paying for the whole fix? Also, has everything been working smoothly since the repair, or have you noticed any other quirks with the roof system? I'm trying to get a sense of what I'm in for here.

Hey again! Just wanted to follow up, since I took my M2 Competition to the mechanic last time, everything's been working perfectly! The sunroof issue hasn't come back at all, which is such a relief. The coding reset they did completely fixed that annoying "Sunroof not initialized" error message. The total damage was only 75 € for the coding work, which honestly felt like a bargain considering how worried I was initially. Way less than I expected to pay, especially after dealing with BMW repair costs in the past! The roof system's been working like a charm, opens and closes smoothly, no more strange noises or error messages. Haven't noticed any quirks since the fix. Seriously, getting it properly coded made all the difference. Just make sure you find someone who really knows their way around BMW electronics, it makes all the difference with these kinds of issues. Feel free to ask if you need any other details about the repair process! Always happy to help another BMW owner out.

Thanks for all the helpful info! Just wanted to update you on what happened with my M4. Finally got the courage to take it to a certified BMW specialist yesterday. Turns out it wasn't as scary as I thought! The mechanic found a similar issue to yours, a faulty control module and a worn-out sensor. The repair was a bit pricier than yours though, came to around 450 for parts and labor. But honestly, watching that roof smoothly open and close again was worth every penny! The best part? They actually showed me what they were doing during the repair, which made me feel way more confident about the whole thing. No more sketchy mechanic experiences for me! The roof's working perfectly now, no more error messages or stuck positions. Really appreciate everyone's advice on this. Sometimes you just need that little push to get things properly sorted. Time to enjoy some open-top driving again!