SQ7 Microphone Failure Blocks Voice & Call Functions

I had a similar Bluetooth issue with my 2018 Q7 last year. With some experience working on car electronics, I initially tried basic troubleshooting like resetting the infotainment system and checking for software updates. The voice recognition system completely failed, affecting both phone calls and voice commands. The audio system played music fine through Bluetooth, but the microphone simply stopped responding. After unsuccessful attempts to fix it myself, I took it to a workshop. They diagnosed a faulty microphone module in the overhead console, which required partial headliner removal to access. The repair included replacing the entire microphone assembly and recalibrating the voice recognition system. Total cost was 815 Euro, covering parts and labor. After the fix, the sound quality during calls was actually better than before, and the voice recognition became more responsive. To better assist with your case, could you share: Any error codes from the diagnostic scan, Whether the issue started suddenly or gradually, If you notice any other electrical issues, If the problem persists after infotainment system resets These details would help determine if your issue matches what I experienced or might be something different.

Last service done at 123976 KM, and you are right, I am having persistent issues with the wireless connection failing and ambient noise interference. The voice commands worked intermittently at first but completely stopped two weeks ago. The audio system volume control and speaker functions remain normal. The error scan shows fault code B127900, Microphone Control Module Signal Error. Already tried the MMI reset multiple times without success. The issue started gradually over a month, getting worse until complete failure. No other electrical problems noticed. Have noticed some crackling sounds from the overhead area when driving on rough roads, which might indicate a loose connection.

Thanks for those additional details. Hearing about the crackling sounds from the overhead area really confirms my suspicions, your issue sounds identical to what I experienced with my Q7. That specific fault code B127900 is exactly what my system showed too. The gradual failure pattern plus the crackling noise strongly suggests a failing microphone module connection, just like my case. The loose connection typically gets worse with vehicle vibration, which explains the deteriorating performance you noticed. After my repair, I learned that moisture can sometimes seep into the microphone housing over time, affecting both the wireless connection stability and sound quality. The crackling you hear is likely the damaged microphone component or a loose wire connection in the overhead console. Since you mentioned trying the MMI reset without success, and given the identical fault code, you are likely looking at the same repair I needed, replacement of the microphone assembly. The good news is that after my repair, the voice recognition accuracy improved significantly, and I have not had any wireless connection issues since. Given your mileage and symptoms, I would recommend going straight for the microphone replacement rather than attempting temporary fixes. The sound quality and connection stability improvement after the repair will be worth it, based on my experience with the same problem.

Thanks everyone for the helpful responses! After getting your insights about the microphone repair and wireless connection issues, I feel more confident about moving forward with the fix. The crackling sounds and error codes match exactly what others experienced, so at least I know what I am dealing with. Going to schedule the repair next week, expecting around 800 Euro based on the quotes shared here. Really hoping the voice recognition and sound quality improvements you mentioned make it worth the investment. Will probably post an update after the repair for others who might face similar microphone module failures. Good to know the audio system volume control and speakers working normally is consistent with this specific issue. Appreciate all the diagnostic help and repair cost information, saved me a lot of troubleshooting time.