VW Touran Bluetooth Calling Failure: Mic Issues Alert

I had a very similar issue with my 2017 VW Tiguan. As someone with some experience working on cars, particularly with electronic systems, I initially tried the basic troubleshooting steps like resetting the infotainment system and re-pairing devices, but the wireless connection problems persisted. The speech recognition system completely failed, and the microphone repair became necessary after the workshop diagnosed the issue. Their testing revealed that the ambient noise cancellation module was defective, which affected both the voice recognition and hands-free calling features. The complete fix included: Replacing the microphone unit, Installing updated firmware, Recalibrating the voice control system, Testing wireless connectivity with multiple devices Total cost was 815€ including parts and labor. The repair took about 4 hours, but the system has worked flawlessly since then. To better assist with your specific case, could you share: Have you noticed any warning messages on the infotainment display? Did this issue start suddenly or gradually? Does the system recognize phone pairing but just fail during calls? Have you had any recent software updates? This information would help determine if your issue matches what I experienced and whether you might need similar repairs.

Thanks for the detailed response. Just had my latest service at 83258km and glad to hear your experience with a similar issue. Your solution matches what I suspected about the microphone repair being needed. The Bluetooth issue started gradually over the past few weeks. No warning messages appear on the display, but the wireless connection keeps dropping during calls. The phone pairs fine initially, but the audio input completely fails when trying to make calls. The ambient noise handling seems particularly problematic, callers say they can barely hear me over the background noise. I will get it checked at the workshop since your repair path seems to have resolved these exact symptoms.

Thanks for those additional details. Based on the symptoms you described, it sounds nearly identical to what I experienced with my Tiguan. The gradual deterioration of call quality and the specific issue with ambient noise handling strongly suggests the same microphone fault I encountered. The lack of warning messages is typical for this failure, the system still thinks its connecting normally, but the microphone component fails to process audio correctly. One quick test you can try: use the voice recognition system to set a navigation destination. If it struggles to understand basic commands, this further confirms the microphone unit is likely failing. Since your service history is similar to what mine was when the issue occurred, its worth noting that the microphone repair resolved both the Bluetooth issue and restored proper speech recognition functionality. The workshop might also want to check the ambient noise cancellation module as this often deteriorates alongside the main microphone unit. Considering the repair costs I mentioned earlier, you might want to have them check if any of this work could be covered under an extended warranty, especially since your car is slightly newer than mine was when the issue occurred. Let us know how the workshop diagnosis turns out, would be interesting to see if they find the same root cause.

Thanks for the feedback. I just got back from the workshop and wanted to close this thread with my outcome. The diagnosis matched exactly what was discussed. They found the microphone unit had failed, affecting both the wireless connection stability and sound quality during calls. The ambient noise cancellation was also malfunctioning, explaining why callers had trouble hearing me clearly. The total repair cost came to 790€, which included: New microphone assembly, Audio input module replacement, System recalibration, Full testing of speech recognition After the repair, the sound quality is perfect and the Bluetooth system works flawlessly again. The voice commands are responsive and clear. For anyone facing similar issues, definitely worth checking the microphone system rather than just assuming its a simple connection problem. Thanks again for helping me identify the likely cause before visiting the workshop, saved time and helped ensure they looked at the right components first.