Chrysler 300 Dies: Flashing Security Light Points to Fix

The symptoms match exactly what happened with my 2011 Chrysler 200 Diesel last season. The flashing security light and immediate engine cut-off strongly indicate an immobilizer fault. This typically occurs when the key signal stops being recognized by the car immobilizer system. A regular mechanic struggled with diagnosing this initially. The issue required a specialist with car electronics expertise and proper diagnostic equipment. The root cause was a failed immobilizer control module, not the key itself. The fix involved: 1. Full diagnostic scan 2. Immobilizer module replacement 3. Key reprogramming 4. System reset and testing This is considered a serious repair since it involves critical security components. An immobilizer bypass was not recommended as it could compromise the vehicle security system. The repair required specialized equipment and dealer-level programming tools. Worth noting, while waiting for parts, the vehicle remained completely undriveable. Getting this fixed at a shop without proper diagnostic capabilities will likely result in unnecessary part replacements and continued issues. Recommend finding a specialist who specifically deals with automotive security systems and immobilizer programming. They should be able to properly diagnose whether its the key, antenna ring, or control module causing the fault.

Thanks for sharing that detailed solution. Had almost identical symptoms with my Chrysler 300, security light blinking and engine dying right after start. Definitely turned out to be an immobilizer system fault in my case too. The remote start would not work either. Curious how much the complete repair ended up costing you? When I had mine fixed, also needed the key signal recalibration along with the module replacement. Been about 8 months since the repair and wondering if you have experienced any recurring issues with the immobilizer or security system?

Glad to report my immobilizer problem was actually much simpler than initially expected. After seeing a car electronics specialist, they diagnosed it was just incorrect key programming causing the immobilizer fault, no module replacement needed. The total repair cost was only 45€ for reprogramming the key signal. The anti-theft system has worked flawlessly since the fix 8 months ago. No more security light flashing or engine cutting out. The remote start function is also back to normal. Having a specialist who really understood car immobilizer systems made all the difference, they quickly identified the actual issue without replacing unnecessary parts. Sounds like your repair was more extensive since you needed both module replacement and recalibration. When these security systems act up, its crucial to get a proper diagnosis from someone who specializes in automotive electronics rather than attempting any immobilizer bypass solutions.

Thanks everyone for the helpful replies. After dealing with this frustrating immobilizer issue, I finally got it sorted. Found a specialist who really knows car electronics and the fix was extensive but worth it. The total repair came to 780€ which included replacing the faulty immobilizer control module and key signal recalibration. Also had them fully test the anti-theft system to make sure everything was working properly. The shop took care of it in one day, though I had to leave the car overnight for final testing. Been driving it daily for 8 months now without any immobilizer warning lights or starting problems. Remote start works perfectly too. Really glad I went to a proper car electronics specialist instead of trying cheaper fixes or immobilizer bypass options that could have caused more issues. Just wanted to update everyone who helped. The repair cost was higher than expected but having a properly working security system is worth the investment.