VW Taos Control Module Failures Disrupt Key Systems

I experienced nearly identical issues with my 2020 VW Tiguan. The warning signals and unusual system failures pointed to a faulty BUS connection in the control module. My check engine light was also intermittently illuminating, storing multiple error codes. The engine diagnostics revealed the control unit cable connection was compromised, causing communication disruptions across various systems. This explained the erratic behavior of the infotainment and navigation systems. This is definitely a serious issue requiring proper attention. The malfunction indicator symptoms match what you describe, and given the potential for more widespread electrical system failures, a dealer visit is strongly recommended. In my case, the service required involved replacing the main control unit harness and recalibrating the system. Given your Taos is so new with low mileage, this repair should be covered under warranty. The symptoms indicate a manufacturing defect rather than wear and tear. The dealer has the specialized diagnostic equipment needed to properly address BUS system communication errors. While waiting for the appointment, document when these failures occur and what systems are affected, as this information helps with diagnosis.

Thanks for sharing your experience with the Tiguan electrical issues. The symptoms you described match mine exactly, especially those warning signals and system failures. I took your advice and went to the dealer last week. They found the same faulty BUS connection in the control module that you mentioned. Would you mind sharing how much the repair cost? Im curious since mine was covered under warranty. Also, have you had any recurring issues since the fix? My scan tool is still showing a few minor codes, though the major problems seem resolved.

Thanks for the follow-up. The OBD-II scan results showing minor codes are fairly common right after this type of repair, they usually clear up on their own after a few drive cycles. Since having the faulty control module connection fixed, my system has been running perfectly with no warning signals or system failures. The repair cost was 155€ for replacing the defective cable connection to the BUS system. However, your warranty coverage was definitely the right way to go given the low mileage on your Taos. The service required was straightforward once they identified the root cause. My infotainment, navigation, and all other electronic systems have worked flawlessly since the repair. If your scan tool continues showing codes after a week or so of normal driving, might be worth having the dealer take another look while still under warranty. The most important thing is that the major fault message and system issues are resolved. Keep monitoring those minor codes, but they should resolve themselves as the system fully stabilizes after the repair.

Had quite an experience resolving those electrical gremlins with my Taos. Following the advice here, I took it to the dealer last week for a proper engine diagnostics check. The service required was exactly what was suggested, they found and fixed a faulty BUS connection in the control module. The dealership experience was actually much better than my previous mechanic visits. Their scan tool confirmed the malfunction indicator issues were indeed from the compromised control unit connection. The whole repair took about 4 hours and was fully covered under warranty. Since the fix, most systems are working normally. The infotainment and navigation are back to normal, and the check engine light has stayed off. There are still a couple minor stored error codes showing up, but the service advisor mentioned these should clear after a few more drive cycles. For anyone facing similar issues, definitely skip the independent shops and go straight to the dealer for these types of electrical problems. The specialized diagnostic equipment they have makes a huge difference in getting it fixed right the first time.