VW T-Cross Transmission Troubles: Sensor May Be Culprit

I dealt with a very similar issue on my 2021 VW T-Roc with the automatic transmission. I have some experience working on cars, mainly doing basic maintenance, but transmission issues are definitely workshop territory. The symptoms you describe match exactly what I experienced, transmission warning light, rough shifting, and limp mode. Initially, I also thought it was just a faulty pressure sensor, but when I took it to the workshop, they found the transmission oil level was significantly low. The mechanic explained that low oil levels can trigger the pressure sensor fault codes because the transmission pressure sensor cant get accurate readings with insufficient fluid. They performed a complete transmission oil level check, topped up the fluid, and cleared the fault codes. Total cost was 365€ including diagnostic, new transmission fluid, and labor. The grinding noise completely disappeared after the repair, and the transmission has been shifting smoothly since then. To better assist you, could you share: Which transmission type you have (manual/auto)? Current mileage? Any recent transmission service history? Are there any oil spots visible under the car when parked? This information would help determine if your issue is similar to what I experienced or if there might be other factors to consider.

Latest service was done at 45000km, currently at 48559km. The advice about checking transmission oil pressure is helpful. However, my situation seems more severe since both the transmission fault and engine warning lights are active simultaneously. After a full diagnostic scan at a certified workshop today, they found multiple fault codes pointing to both a faulty transmission control module and pressure sensor issues. Unfortunately, the repair quote is significantly higher at 2800€ for parts and labor. The technician recommends replacing both components since the transmission control module may have been damaged from operating with incorrect pressure readings. Will get a second opinion, but wanted to confirm if anyone has experience with similar repair costs for these specific components. Has anyone successfully resolved similar transmission issues by only replacing the sensor without the control module replacement?

I can relate to your situation since I went through something very similar with my T-Roc. When my transmission began acting up, I also got multiple fault codes related to both the control module and sensor. Initially, I tried only replacing the transmission oil pressure sensor (450€) hoping to save money, but the problems persisted. The transmission fault codes kept returning, and the shifting remained problematic. After two weeks, I had to go back and get the control module replaced as well. Looking back, I should have done both repairs at once. The total ended up costing me around 3000€ for both components plus labor, which is close to your quoted price. The sensor fault had indeed caused damage to the control module over time. The workshop explained that when the pressure sensor provides incorrect readings, the control module tries to compensate by adjusting transmission parameters. This continuous incorrect adjustment eventually damages the module itself. Since the repair, my transmission has worked flawlessly for the past 15000km. While the cost was significant, replacing both components resolved all the transmission issues completely. The grinding noises disappeared, and the gearbox shifts smoothly again. For such a new car, it might be worth checking if any of these components are still under warranty, as this repair cost is quite substantial.

Thanks for the detailed feedback about the transmission sensor and control module issues. Your experience with first replacing just the sensor matches what I was worried about, that it might not solve the complete problem. Given the high repair costs involved and my car being new, I contacted the manufacturer directly. They confirmed parts of the transmission system are still under the drivetrain warranty. I will bring the diagnostic results and repair quote to the nearest authorized dealer tomorrow. In case the warranty claim gets denied, I will likely proceed with replacing both components at once based on your experience. No point trying to save money on the sensor alone if the control module is also compromised. The symptoms and fault codes seem too similar to risk a partial repair. Will report back once I know more about the warranty coverage and final repair solution. The transmission oil pressure readings and multiple fault codes definitely point to both components needing replacement to properly resolve these issues.