VW Up Starting Failure Linked to Immobilizer Fault

Recently experienced similar symptoms with a 2015 VW Polo TSI. The immobilizer fault caused identical starting issues, engine cutting out immediately after brief start attempts. The anti-theft system was incorrectly recognizing the key signal. The root cause turned out to be a failed key programming procedure during routine maintenance. The ignition control module needed reprogramming and synchronization with both keys. This was not a simple fix since it required specialized diagnostic equipment to reset the immobilizer system. The repair involved: Full diagnostic scan to confirm the immobilizer fault, Reset of the anti-theft system, Complete key programming sequence, Testing with both primary and spare keys, Final system verification through multiple cold starts While this was a serious issue requiring dealer-level equipment, no mechanical components needed replacement. Would strongly recommend having this diagnosed at a shop with proper VW diagnostic capabilities, as generic scanners often cant properly interface with the security system. The symptoms match exactly what happens when the immobilizer fails to authenticate the key signal properly. Getting this fixed promptly is important since continued starting attempts could drain the battery.

Thanks for sharing your Polo experience. Had almost the exact same symptoms with my Up last winter, the remote start would fail and engine died right after turning over. Took it to a certified shop and they confirmed the immobilizer fault through their diagnostics. The fix worked perfectly and I havent had any starting issues since. Just wondering, how much did the key programming and system reset end up costing you? Also, has everything stayed working properly since the repair?

After getting the immobilizer bypass procedure done at the certified shop, I havent experienced any security light issues or starting problems. The total cost was 45€ for reprogramming the key and resetting the car immobilizer system. The technician explained that the previous incorrect key programming was causing the ignition control module to misread the security signal. Since the fix, the remote start works flawlessly and the engine starts normally every time without cutting out. It was definitely worth getting it properly diagnosed and repaired by specialists with the right diagnostic equipment. Having a properly functioning anti-theft system is crucial, and the relatively low repair cost made it a straightforward decision.

I finally took my Up to a specialized VW shop last week. They diagnosed the immobilizer fault using their advanced diagnostic tools. Turns out my previous mechanic messed up the key programming during routine service, causing the anti-theft system to malfunction. The repair was straightforward, they reset the immobilizer and reprogrammed both my keys. Total cost came to 55€, which seemed fair considering the specialized equipment needed. The ignition control module is now properly synchronized, and the car starts perfectly every time. Really glad I asked here first and got pointed toward a proper diagnostic shop. Saved me from wasting time with generic scanners that cant properly read the security system. The remote start works great now, and I havent had a single failed start since the fix.