VW Golf Warning Lights & Turn Signal Malfunction Fix

I had nearly identical issues with my 2018 VW Passat Hybrid last winter. As someone with some basic experience working on cars, I initially thought it was just a simple turn signal bulb problem. The erratic flashing and speedometer errors pointed to an electrical fault. After a quick inspection, I could see all lamps were intact, but the turn indicator behavior remained inconsistent. The flasher relay seemed to work intermittently. The workshop diagnosed it as a damaged wiring connector near the front left turn signal assembly. Moisture had corroded the connection, causing intermittent electrical contact. They replaced the cable harness connector and thoroughly checked the entire turn signal circuit. Total cost was 95€ for parts and labor. What specific warning messages are you seeing? Also, have you noticed if the problem gets worse in wet weather? This could help determine if your issue is similar to what I experienced. Before you head to the workshop, could you share: Does the problem affect other electrical systems? Are both turn signals affected or just the left side? Have you noticed any moisture in the headlight assembly? This information would help identify if youre dealing with the same connector issue or potentially something different.

Thank you for looking into this. My car has 46880km and had its last service 3 months ago. The warning messages only appear when using the left turn signal. The right side works perfectly fine. After checking the lamp assembly, I noticed slight condensation inside the left headlight unit. Other electrical systems seem unaffected. The flashing becomes more erratic during rainy conditions, which makes me think your suggestion about moisture-related issues could be spot on. The turn indicator problems started right after a particularly heavy rainfall. Based on your experience, I will check the wiring connector near the front left assembly. If there is visible corrosion, this might indeed explain both the broken lens warnings and erratic flasher relay behavior.

Good to hear your symptoms match what I experienced, especially the moisture sensitivity and the isolation to the left side indicator. Those are telltale signs pointing to corroded connectors. The condensation you noticed in the headlight assembly is a red flag. In my case, that moisture was seeping into the wiring connector, creating intermittent electrical faults that confused the car's computer system. The signal lamp would work inconsistently because the connection kept making and breaking contact. Since your symptoms worsen in wet conditions just like mine did, and considering the timing after heavy rain, I am even more convinced you are dealing with the same issue. The turn indicator circuit is designed to throw those error messages when it detects irregular current flow. A thorough inspection and replacement of that connector resolved all my electrical fault warnings. The repair shop also resealed my headlight assembly to prevent future moisture intrusion. They applied dielectric grease to the new connector for added protection. Just watch out for any workshop suggesting complete lamp replacement, the indicator light assembly itself is likely fine. The wiring harness connector is the real culprit.

Based on your description of the condensation and correlation with rainy weather, I am now fairly certain we are dealing with the same electrical fault. I will have the workshop focus on inspecting the wiring connector area first. The automotive lighting issues seem identical, erratic signal lamp behavior confined to the left side, speedometer errors, and fault codes appearing specifically when using the turn indicator. The timing after heavy rainfall and increased problems in wet conditions strongly suggest moisture-related damage. I will ask them to: Check and likely replace the wiring connector, Inspect the headlight assembly seals, Apply dielectric grease to prevent future corrosion, Test the entire turn signal circuit This targeted approach should cost around 100€ rather than unnecessarily replacing the whole light assembly. Thanks for helping narrow down the likely cause. I will update once the repair is complete to confirm if the connector was indeed the root issue.