VW Sharan Dies After Start, Likely Immobilizer Issue

Had the exact same immobilizer fault symptoms on my 2012 VW Touran 2.0 TDI. The key signal would register but the engine would die seconds after starting, identical to what you describe. The issue emerged from incorrect key programming during routine maintenance where the shop accidentally corrupted the immobilizer data. This is actually a known problem with VW car electronics when service centers dont follow proper procedures. Going for an immobilizer bypass is risky and could cause permanent ECU damage. The proper fix requires dealer-level diagnostic equipment to reprogram the immobilizer and sync it properly with the key transponder. In my case, the repair involved: Full diagnostic scan, Immobilizer control module reset, Key transponder reprogramming, ECU adaptation This was a serious issue requiring specialized equipment. The original shop should cover the repair costs since their service work likely caused the immobilizer fault. Would strongly advise against DIY fixes or aftermarket bypasses, proper dealer diagnostics are essential for these security systems. The positive news is that once properly reprogrammed, the system works reliably with no recurring issues.

Thanks for sharing your Touran experience, sounds very similar to my situation. The dealer ended up fixing my immobilizer and key programming issues last week. Just wanted to check back and see what the final repair bill was in your case? My dealership charged 450€ but claimed that was actually a discounted rate since it needed special diagnostic equipment for the immobilizer bypass procedure. Also curious if youve had any issues with the remote start or other electronic functions since getting it fixed? My key fob has been working perfectly but just want to make sure nothing else typically goes wrong after this type of repair.

The total repair cost for my Touran anti-theft system reset was only 45€, which seems much more reasonable than what you were charged. The key programming issue was fairly straightforward once they had the right diagnostic tools connected. Since having the immobilizer fault corrected, all car electronics have worked flawlessly, no problems with the key fob, remote functions, or ignition control system. Its been running perfectly for several months now. 450€ sounds quite steep even with specialized equipment. Most VW dealers can handle basic key programming and immobilizer resets as routine procedures. Might be worth questioning that bill or getting a second opinion, as the standard rate for this type of electronic repair is typically much lower. The main thing is that your car is working properly now, but I would still discuss that pricing with the service manager.

I got it fixed last week and wanted to update how it went. Took it to a different VW specialist who immediately spotted the security light pattern indicating a corrupted immobilizer signal. They ran a full diagnostic scan which revealed the previous shop had messed up the key programming during their service. The new mechanic was able to reset and reprogram everything properly using their VW-specific equipment. Total cost came to 280€ including: System diagnostic testing, Immobilizer reset and reprogramming, New key signal calibration, Final system verification Car starts perfectly now and all remote functions are working like normal. Really glad I didnt try any DIY immobilizer bypass solutions that could have caused more issues. Having the right diagnostic tools and expertise made all the difference. The original shop agreed to reimburse part of the repair cost since their work caused the problem. Definitely learned to be more careful about who works on the car electronics.