Subaru Stella Dies After Start, Immobilizer Alert

Having experienced nearly identical symptoms with my 2018 Subaru Outback, this sounds like a classic anti-theft system malfunction. The key programming can become corrupted, causing communication issues between the key transponder and the ignition control module. When my car showed these symptoms, the security light would flash and the engine would shut down immediately after starting. The diagnostic revealed a fault in the immobilizer system. The repair required reprogramming of both the key and the car electronics module. Its worth noting this was a serious issue that required specialized diagnostic equipment. Main concerns to check: Key transponder functionality, Immobilizer antenna ring around ignition, Main ECU communication with security system, Battery voltage level For proper repair, you need a shop with advanced diagnostic tools specific to Subaru remote start and security systems. Regular scan tools often cant access the anti-theft system properly. The repair isnt typically a quick fix as it requires careful diagnostic steps to prevent damage to the security system. Would strongly suggest finding a shop that specializes in car electronics and specifically mentions key programming capabilities in their service list.

Thanks for the detailed response about the immobilizer fault. Your situation sounds exactly like what I experienced. The security light and immediate shutdown were particularly frustrating. I ended up getting it fixed with a complete immobilizer bypass and key reprogramming since the original system was too damaged. Curious, do you remember roughly what the repair cost you? Also, has everything worked properly since the fix, or have you noticed any quirks with the anti-theft system?

Thanks for asking about the repair outcome. After getting the immobilizer fault fixed by reprogramming the key, my car has been running perfectly with no security light issues. The total cost came to 45€, which was reasonable considering the specialized car electronics knowledge needed. The anti-theft system now works exactly as intended, no more false alarms or engine shutdowns. Unlike your case, I didnt need a complete immobilizer bypass since the original system could be restored through proper programming. Its been several months now without any quirks or warning lights. This type of repair really needs proper diagnostic equipment and expertise with security systems. The investment in getting it done right the first time was definitely worth avoiding further immobilizer problems.

Taking my car to the shop last week finally resolved all these issues. Found a specialist who really knew their way around car electronics and immobilizer systems. The whole process took about 2 hours, they diagnosed the faulty transponder chip and reprogrammed both keys. Total cost came to 380€, including the diagnostic fee. While not cheap, it beats the headache of unusual shutdowns and constant security light warnings. The car starts perfectly now, no more warning lights or error codes showing up. Best part is the remote start feature works again too. The mechanic explained that the original immobilizer fault was causing interference with multiple systems. Glad I asked here first, helped me understand what to look for in a repair shop and what questions to ask.