T-Cross HVAC Fault Linked to Sunlight Sensor Issues

Had the same situation with a 2019 T-Roc. The sunlight sensor malfunction caused irregular climate control behavior. The sensor fault initially seemed minor but actually affected multiple systems since the solar sensor data feeds into both HVAC and auto headlight controls. The root cause turned out to be a damaged wiring harness connector near the windshield base where the sensor sits. Moisture had corroded the pins, causing intermittent sensor readings. This created confusion in the climate control module, leading to incorrect temperature regulation. The repair required sensor calibration after replacing both the wiring connector and the complete sunlight sensor unit. Not exactly a quick fix since accessing the area meant partial dashboard removal. The automotive sensor system needed full recalibration afterward to restore proper function. Worth noting, while the sensor itself can fail, connector issues are more common. Getting a proper diagnostic scan first helps pinpoint whether its the sensor or wiring. This isnt a DIY job due to the calibration requirements and risk of damaging other components during disassembly.

Thanks for sharing your experience with the T-Roc sensor issues. Your description matches my situation exactly. Finally got mine fixed last week, the faulty daylight sensor was indeed causing havoc with the climate controls. The automotive sensor replacement plus recalibration sorted it out. Can you remember roughly what the repair cost in your case? Mine seemed a bit steep and I want to compare. Also curious if youve had any other sensor fault codes or HVAC quirks since the fix?

The repair cost for my T-Roc was actually quite reasonable at 95€, mostly because it turned out to be just a faulty cable connection to the solar sensor rather than needing a full sensor replacement. The mechanic found corrosion in the plug connection and fixed it without having to replace the entire automotive sensor unit. Since getting that repair done, the HVAC system has worked flawlessly. No more fault codes or strange climate control behavior. The daylight sensor now correctly adjusts the auto climate settings based on sun intensity, and the whole system responds as it should. Its worth mentioning that what initially seemed like a complex HVAC sensor issue was resolved without needing expensive parts replacement. Sometimes these automotive sensor problems are more about connection issues than actual component failure. Regular inspection of sensor connections during maintenance can prevent similar issues from developing.

I took your advice about the sensor and finally got it sorted. What started as a frustrating fault code turned into a straightforward fix. Drove to a new mechanic who actually specializes in automotive sensor systems. Right away, they identified corrosion in the HVAC sensor wiring, not a complete sensor failure like the previous shop claimed. The repair took about 3 hours, costing 220€ including diagnostics and labor. They cleaned the connections, replaced a damaged wire section, and recalibrated the solar sensor. The difference is remarkable, climate control works perfectly now, and no more fault codes showing up. The mechanic also showed me the corroded parts and explained how moisture had caused the sensor fault. This explained why the previous garage struggled to diagnose it properly. Getting a second opinion from a specialist really paid off, saving me from an unnecessary complete sensor replacement that would have cost triple.