Nivus TSI Transmission Failure Points to Radiator Issue

Had similar transmission problems with a Taigo 1.0 TSI. The radiator coolant was mixing with transmission fluid through a failed oil cooler, causing transmission malfunction and limp mode activation. Key findings during repair: Oil cooler showed internal cracks, Contaminated transmission fluid, Failed pressure gauge readings, Radiator repair was necessary due to cross-contamination The leak detection process revealed transmission fluid in the cooling system. This required a complete system flush, oil cooler replacement, and new transmission fluid. This is a serious issue that can cause permanent transmission damage if not addressed quickly. Recommend getting a second opinion and specifically requesting pressure testing of the oil cooler system. The symptoms match a common failure point in these transmissions when the oil cooler integrity is compromised. The repair is extensive but necessary to prevent complete transmission failure. Make sure any shop performing the work pressure tests both systems to confirm the diagnosis before starting repairs.

Thanks for sharing your experience. Your case sounds exactly like what happened with my VW Nivus last winter. The radiator repair and transmission flush solved the issue completely. The cooling system has been working perfectly since then. Quick question, do you recall the total repair cost for your Taigo? And has everything been running smoothly since the fix? Just wondering if any other cooling system issues came up afterwards.

Following up, yes, everything has been running perfectly since getting the radiator oil pressure sensor fixed last month. The total came to just 95€ for repairing a faulty cable connection at the pressure gauge unit. Much cheaper than initially expected. No car overheating or transmission problems since the repair. The leak detection tests confirmed the oil cooler and all other cooling system components were actually fine, it was just the pressure sensor causing false readings that triggered the transmission safety mode. Regular radiator coolant checks show normal levels and no cross-contamination issues. The transmission shifts smoothly now and all warning lights cleared up immediately after the fix. Really glad it turned out to be a simple electrical issue rather than the major repair we first feared.

Thanks everyone for the helpful insights. Just wanted to share how my situation got resolved, took the car to a different mechanic for a second opinion last week. They found the actual issue was a failed pressure gauge sending incorrect signals, similar to what was mentioned. The cooling fan was working properly and there was no coolant leak. Total repair cost was 280€ for replacing the faulty sensor and performing a diagnostic system reset. The transmission is now shifting perfectly and all warning lights are off. Really relieved it wasnt the major repair my first mechanic suggested. The new shop did a thorough leak detection test which confirmed all other components were fine. Lesson learned, always worth getting a second opinion when facing potentially expensive repairs. Regular cooling system maintenance from now on to prevent future issues.