VW Golf TDI Trans Issues: TCM & Converter Warning Signs

Had nearly identical automatic transmission issues with my 2012 VW Passat TDI. Started with hesitation during gear changes and progressed to obvious transmission slipping. As someone with moderate DIY experience, I knew this was beyond my skill level. The converter failure symptoms matched exactly what you describe, grinding noises, warning lights, and rough shifting patterns. The automatic gearbox specialist confirmed the torque converter was severely damaged and needed replacement. The total repair came to 2120€, which included: New torque converter, Transmission fluid change, Labor costs, Updated transmission software The repair took about 3 days. Since the fix, the automatic transmission has worked flawlessly for 40000 km. Before offering more specific advice, could you share: Current mileage, Service history details, When was the last transmission fluid change, Any previous transmission repairs, Does the problem get worse when the engine is hot or cold These details would help determine if your issue is similar to what I experienced with the converter failure in my Passat.

Thanks for sharing your experience. My Golf has 67617km on the clock with the last major service done 4 months ago. The transmission fluid was changed during that service. The problems seem most noticeable when the engine is hot, especially during highway driving when the lock-up clutch should engage. The automatic transmission slipping gets progressively worse the longer I drive. The engine surge during gear changes is quite concerning. Based on your repair costs, I should probably start setting aside funds for the worst case scenario. Did your automatic gearbox specialist mention any preventative steps to avoid further damage while waiting for the repair appointment?

I had the same experience with my Passat regarding worse symptoms during hot conditions. The engine surge and transmission slipping became really noticeable after about 20 minutes of driving, especially at highway speeds. Until you can get it repaired, here are the measures that helped minimize transmission stress in my case: Avoid aggressive acceleration, Let the car warm up for 2-3 minutes before driving, Manually shift at lower RPMs when possible, Reduce highway speeds slightly, Plan shorter trips when possible The converter fault in my case showed similar behavior, getting worse with heat and extended driving. The lock-up clutch would start slipping more noticeably after the transmission warmed up. Since your mileage is lower than mine was (mine had 89000km), you might catch the transmission repair early enough to prevent additional damage. The earlier you address converter failure symptoms, the better chance of avoiding cascading transmission problems. One thing to note, my transmission repair costs were slightly higher because I waited too long, causing additional wear. Getting it checked soon could save you money in the long run. Would recommend documenting when and how the symptoms occur, as this helps the transmission specialist diagnose the exact issue faster.

Thanks for the detailed advice. Given how similar our issues sound, especially the automatic transmission problems getting worse with heat, I should probably get this looked at ASAP. The clutch problem seems to match exactly what you experienced with your torque converter. The preventative measures you suggested make a lot of sense. I will definitely start taking it easier on the transmission and avoid long highway trips until I can get it into a specialist. Already called a local automatic gearbox shop and they can see it next week. Your point about documenting symptoms is smart, I have started keeping notes about when the transmission slipping occurs and under what conditions. Hopefully catching this early will keep my repair costs lower than what you experienced. Really appreciate you sharing your experience with the converter fault and repair process. It helps having a realistic idea of the potential costs and timeline. Will update once I get the official diagnosis.