VW Taos Transmission Nightmare: TCU Malfunction Alert

I had very similar transmission problems with my 2019 VW T-Cross (some experience with VAG vehicles). The symptoms were almost identical, erratic gear changes, transmission going into limp mode, and electronic issues with the paddle shifters not responding. After proper transmission diagnosis, my workshop found that the transmission control unit was indeed defective. The car computer was showing multiple error codes related to the transmission management system. They confirmed it wasnt a mechanical transmission repair issue but rather an electronic fault in the control module. The total repair cost was 1000€, which included: Diagnostic testing, Replacement control unit, Programming and adaptation, Labor costs The repair resolved all the transmission problems completely. The gear changes became smooth again and all electronic functions were restored. To help provide more specific advice for your case, could you share: Current mileage, Any warning lights showing, When the problems first started, Whether the issues occur more in cold or warm conditions, Specific error codes if you have them These details would help determine if your issue is similar to what I experienced and whether you might be looking at a similar solution and cost range.

Thanks for the insight regarding the transmission control unit. My current mileage is 67349km and my last service was performed just a month ago. The computer is showing error code P0722 specifically and the transmission problems started appearing gradually over the past 2 weeks. Initially just rough shifts, now progressing to more serious gearbox issues. The problems seem consistent regardless of engine temperature. The check engine light comes on intermittently, usually when the transmission control starts acting up. No other warning lights are present. Good to know about the electronic issues being the root cause in your case rather than mechanical transmission repair being needed. Your repair costs sound reasonable compared to what I was worried about. Will get it checked focusing on the control module and automotive ECU diagnostics first.

Based on your error code P0722 and symptoms, it definitely sounds like the same transmission control issue I experienced. This code typically indicates problems with the output speed sensor circuit, which directly affects how the transmission control unit manages gear changes. After my repair, I learned that VW transmission control units from this period can be sensitive to electrical interference and voltage fluctuations. The gradual progression of symptoms you described matches exactly what I went through, starting with just rough shifts and deteriorating from there. The transmission diagnosis in my case showed that when these control units start failing, they often exhibit these exact patterns: Initial unclean shifting, Progressive worsening of gear changes, Intermittent check engine lights, Eventually triggering limp mode Since your mileage and symptoms align so closely with what I experienced, and considering the electronic issues are showing the same pattern, I strongly suspect youre dealing with the same transmission control unit failure. The fact that the problems persist regardless of engine temperature further supports this diagnosis. The good news is that once replaced, these units typically provide years of reliable service. Just ensure the workshop performs proper programming and adaptation after installation, this was crucial for my repair success.

Thanks for the detailed information about your transmission control unit repair. The P0722 error code and symptoms you found match my situation perfectly. My odometer shows 67349km and the problems started appearing gradually over the past 2 weeks, progressing from rough shifts to more serious gearbox issues. The check engine light appears intermittently when the transmission control acts up, but no other warning lights are present. The issues remain consistent regardless of engine temperature. Based on your experience with electronic rather than mechanical transmission repair, I feel more confident about the potential diagnosis and repair costs. Your point about VW transmission control units from this period being sensitive to electrical interference is especially helpful. Will definitely make sure any workshop I visit focuses on proper control module diagnostics and programming after replacement. The repair cost of around 1000€ sounds much more reasonable than I feared for the transmission problems I'm experiencing. I plan to get it checked next week, with emphasis on checking the automotive ECU and transmission control unit first before exploring other potential issues. Thanks again for helping clarify what I might be dealing with here.