T-Cross Climate Control Failed Due to Faulty Temp Sensor

Had the exact same climate control problems with my 2021 T-Roc a few months ago. With some experience working on VW vehicles, I first suspected a general HVAC sensor malfunction when the auto climate system stopped responding. The symptoms matched yours, no AC function and error codes related to temperature readings. After taking it to the workshop, they ran sensor diagnostics and found that the wiring harness connecting to the interior temperature sensor had deteriorated. The cable connection was loose, causing intermittent temperature reading failures. The fix was straightforward, they replaced the damaged wiring and connectors, which solved all climate issues. Total cost was 95€ including labor. Much better than replacing the entire sensor unit. Before suggesting specific fixes for your case, could you share: Have you checked if the manual AC controls still work? Which error codes are you getting exactly? Does the issue happen all the time or intermittently? Any unusual sounds from the climate control unit? This information would help determine if you are dealing with the same root cause or if there might be other issues with your T-Cross climate regulation system.

Just had my car in for the 65000km service last week, so these details are fresh. The manual AC controls actually do work intermittently, suggesting the core AC system is fine. After running deeper diagnostics, error code P0537 keeps appearing, which points specifically to the AC temperature sensor circuit. No unusual sounds from the unit. Your wiring harness solution is particularly interesting, initially, I was convinced the HVAC sensor itself needed replacement. The temperature reading seems most erratic during cold starts, becoming more stable after the car warms up. This irregular temperature sensor behavior matches what you described with the loose connections. Will have the wiring checked first before committing to a full sensor replacement. Really helpful to know the potential repair costs stayed under 100€ in your case.

For sure, those symptoms match my T-Roc situation perfectly. The P0537 code is exactly what my system showed, and the temperature reading instability during cold starts was a major clue. The sensor diagnostics also indicated similar erratic behavior in my case. Like you mentioned, the manual climate control would work sometimes, which helped rule out a complete HVAC sensor failure. When the workshop investigated the wiring, they found slight corrosion at the connector points causing those inconsistent temperature readings. Quick tip from my repair experience, make sure they check the entire wiring path to the climate control module, not just the immediate sensor connections. In my case, there was also a small issue with the ground connection that contributed to the irregular temperature sensor performance. The fact that your readings stabilize after warmup strongly suggests a connection issue rather than a faulty sensor itself. This behavior is characteristic of loose or corroded wiring affecting the temperature sensor circuit. While sensor replacement might eventually be needed, starting with the wiring inspection makes sense given these similarities. The repair should be similarly affordable if it turns out to be the same wiring harness problem.

Thanks for sharing those repair details about the wiring harness solution. I checked with my local workshop and they can inspect the wiring connections next week. They quoted around 85€ for a full sensor diagnostics and wiring check, which seems reasonable given your experience. The temperature sensor issues have remained consistent, stable readings once warm but erratic during cold starts. The P0537 error keeps showing up during every drive cycle. Still getting intermittent manual AC function which gives me hope its just a connection problem rather than complete sensor failure. After comparing your climate control problems with mine, I feel more confident about skipping straight to sensor replacement. Will have them thoroughly check all wiring paths and ground connections first. The irregular temperature readings match your situation so closely that I suspect we had the same root cause. Will update once they complete the inspection and wiring repairs. Really helpful to know what to expect, especially regarding the repair costs and diagnostic approach.