A car's immobilizer system is most basically an anti theft system located in the engine ECU that prevents your vehicle's engine from running unless the correct transponder key is present.
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What does it mean when your car won't start but clicks?
It might be a battery or alternator problem.
A rapid clicking noise when trying to start your car could mean there's something wrong within the electrical system. Perhaps your battery's dead, or your alternator, which charges the battery, isn't working correctly. ... You may need to replace your alternator or battery.29 Jul 2019
You will need the Date code, the Encrypted Pin and the Origin of the Immobilizer system. The details can be found either on the sticker of the IMMU unit around the ignition lock, or on the sticker of the SEC unit located between the steering wheel and the center console.