VW Taos SOS Emergency System Failure Fix Alert

As someone with some experience in automotive electronics, I had a similar malfunction on my 2021 VW Tiguan last year. The telematics system showed multiple warning lights and diagnostic codes related to the emergency call system. After checking with my workshop, they found the root cause was a faulty cable connection to the SOS module. The diagnostic scan revealed intermittent signal issues between the control unit and the emergency call system. The repair involved carefully inspecting and replacing damaged wiring connections near the overhead console. Total cost was 95€ for the repair including labor. Since the repair, all systems have worked perfectly with no warning lights or error messages. The car safety systems are now functioning as intended. However, to provide more specific guidance for your case, could you share: Have you performed a diagnostic scan? What specific error codes are showing? Are there any visible damage or loose connections around the overhead console? Did this start happening suddenly or gradually over time? Have you had any recent work done on the vehicle electrical systems? This information would help determine if your issue matches what I experienced or if it might be something different requiring alternative solutions.

Latest service was at 105000km. The call failure issue persists even after the workshop checked all the wiring and connections as suggested. They ran multiple diagnostic scans showing fault code B100800 related to the emergency call system. Interestingly, they found the telematics control module itself shows signs of internal malfunction. The technician mentioned possible water damage, though I have no idea how that could have happened. They estimate 450€ for a new module plus programming. Want to confirm if anyone else had to replace the entire unit or if there might be a more cost-effective solution before proceeding. Since this is a safety system, I want to get it fixed properly despite the high cost. The SOS signal function is crucial for emergencies.

Thanks for providing those details about the B100800 fault code and the workshop findings. I actually went through almost the exact same situation with my Tiguan last year. While my initial issue was resolved with the wiring repair I mentioned before, the problem returned a few months later with the same error code you described. The second diagnosis also revealed internal damage to the telematics control module. Despite checking all connections again, the call failure persisted. I ultimately had to replace the complete module as the technician suggested there was no reliable way to repair the internal components. The cost was similar, I paid 440€ including programming and testing. While expensive, it completely resolved the malfunction. The new control module has been working flawlessly for over 8 months now. In terms of the water damage theory, these modules can be sensitive to moisture from various sources. In my case, they found condensation had formed inside the unit due to a small seal failure. The car safety systems rely heavily on this module functioning correctly, so I agree that proper repair is essential despite the cost. My suggestion would be to proceed with the module replacement since your symptoms and diagnostic results match what I experienced. Just ensure they fully test the emergency call system functionality after installation.

Thank you all for the helpful responses and sharing your experiences. After considering the feedback and similar cases, I will proceed with replacing the telematics control module. The matching fault codes and symptoms, particularly the B100800 related to the emergency call system failure, make me confident this is the right call. While 450€ is significant, maintaining proper car safety systems is worth the investment. The SOS signal functionality could be crucial in an emergency situation. I will make sure the workshop thoroughly tests all telematics features after installing the new control module. I will update once the repair is complete in case anyone else encounters similar issues in the future. Maybe this information can help others diagnose and fix their emergency call system problems more efficiently.