VW Golf Parking Assist System Complete Failure Fix

I had a comparable issue with my 2015 VW Passat TDI. Based on my experience working on VWs, this sounds very familiar. The parking sensors and parking assist system stopped working similarly. The control module was getting power, but none of the radar sensors were responding. After some diagnostics, it turned out to be a damaged wiring harness connector at the main plug connection. The fix was relatively straightforward, the workshop found the faulty connection in the wiring between the parking assist control module and the sensor array. Total repair cost was 95€ including labor and parts replacement. Before you head to the shop, it would help to know: Have you noticed any moisture or water exposure in the trunk area? Did the system fail gradually or suddenly? Are you getting any specific error codes on the dash? Have you had any recent body work done near the sensors? These details would help determine if your issue matches what I encountered. The blind spot sensors often share the same control module, so checking if those are also affected could help narrow down the problem. Most parking sensor issues stem from either damaged connections or failing control modules, with wiring problems being more common and less expensive to fix.

Just got my latest service done last week. The issue you describe matches exactly what happened to me. In my case, faulty wiring between the parking assist control module and the sensor array was causing the problem. What helped diagnose it was that the failure happened suddenly after driving through heavy rain. The obstacle detection system completely stopped working right after. The repair involved replacing a corroded wiring harness and resealing the connections. Total cost was 180€ and fixed both the parking sensors and parking assist functionality. The workshop found moisture had gotten into the main connector, causing intermittent failures before complete system shutdown. Worth checking if water leaked near your trunk seals or rear bumper area, as this often leads to wiring corrosion in these systems.

Good to hear you got it sorted, sounds exactly like what I experienced. The sudden failure after rain is a telltale sign of water intrusion affecting the parking assist system. My repair was a bit cheaper at 95€ because they only needed to replace a small section of the wiring harness. Looks like your case required more extensive work on the connections. These control modules are generally pretty robust, but the wiring and connectors can be vulnerable to moisture damage. After my repair, I had them apply extra sealant around the proximity sensors and check all the trunk seals. No issues since then, even in heavy rain. The blind spot sensors stayed functional throughout, which helped confirm it was specifically a parking assist wiring problem rather than a failing control module. For anyone else reading this thread, if your parking assist suddenly fails after wet weather, checking the wiring connections should be your first step. Water damage to these connections is much more common than actual sensor failures.

Thanks for sharing those details about your repair experience. Yes, the water exposure definitely seems to be the common factor in these parking assist failures. The workshop also showed me the old corroded harness they removed, and it was clear where moisture had gotten in through a compromised seal. Pretty relieved it was just wiring and not a full control module replacement, which would have cost significantly more. One tip from my experience, I had them apply additional waterproofing around all the proximity sensors and radar sensors while they were working on it. The rearview camera housing also got extra sealant since it shares the same area. Better safe than sorry with these electronic systems. So far everything has been working perfectly through several rainstorms. The parking assist, blind spot sensors, and all obstacle detection are back to normal. Pretty happy with the 180€ repair cost considering what it could have been if the control module itself was damaged. Going to keep an eye on those trunk seals from now on to prevent any repeat issues. Thanks again for confirming this is a known weak point in these systems.