Taos Engine Temp & Coolant Issues After Software Work

Had similar symptoms with a 2019 VW Tiguan. The diagnostic trouble code pointed to a faulty control module caused by incorrect software updates. The coolant leak turned out to be a compromised connection between the control unit and cooling system sensors. The fix required: Complete diagnostic system scan, Reflashing the engine control module, Replacing damaged wiring harness connectors, Clearing communication fault codes, Testing sensor connectivity This was a serious issue that needed immediate attention since faulty communications between control modules can lead to engine damage. The coolant leak was actually a secondary problem caused by the control unit not properly regulating the cooling system. Key checks before repair: Get the specific diagnostic trouble codes read, Verify if recent software updates were done, Check service history for any cooling system work, Test all electrical connections to temperature sensors, Confirm coolant is actually leaking and not overflow Best to find a shop with certified diagnostic equipment and experience with VW control module programming. This type of connectivity issue needs proper diagnostic tools to resolve correctly.

Thanks for sharing your experience. I had that same problem with my Taos recently. The coolant leak combined with those CAN bus connectivity issues was quite concerning. The data link failures between modules made the engine management system go haywire. A thorough car diagnostics scan revealed multiple communication faults that needed fixing. My repair also included a software reset and new connectors, but I had to replace the temperature sensor too. Mind sharing what the total repair cost was in your case? Also curious if youve had any recurring software glitches since getting it fixed? These control module issues can sometimes come back if not properly resolved.

Thanks for asking about the costs. Since having the faulty control unit communication fixed, everything has worked perfectly with no recurring software glitches. The repair came to 95€ for replacing the damaged cable connections and reprogramming the module. The diagnostic trouble code scan helped identify that the issue was mainly a compromised wiring connection affecting the control modules, rather than a more serious electronic fault. Getting this fixed early likely prevented more expensive damage to the engine management system. Its been 6 months now with no temperature sensor issues or communication faults between modules. The coolant system is working as designed with stable readings. The key was finding a shop that could properly diagnose the root cause rather than just treating symptoms.

Thanks for the input. I took my Taos to a certified shop last week that specializes in control module diagnostics. They found multiple wiring issues causing the communication faults, likely from the previous mechanic mishandling the connections. The total repair came to 780€ including: Full diagnostic system scan, New temperature sensor installation, Wiring harness repair, Control module reprogramming, Coolant system flush and refill The car runs perfectly now, no more check engine light or temperature warnings. The connectivity issue with the CAN bus system was fixed by replacing damaged connectors and updating the control module software properly. The shop walked me through all the car diagnostics and showed exactly where the previous mechanic went wrong. Really glad I found them instead of going back to the shop that caused these problems. Already put 500km on it since the repair with zero issues.