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How to Install a Ghost Immobiliser A ghost immobiliser is a hidden security device that protects your vehicle from hacking and key cloning. It prevents the engine from running until a PIN code is entered. This could be as long as 20 characters. It is undetectable by thieves, who are unlikely to think about this additional layer of security. Some systems also have an application that allows owners to disable the immobiliser if they forget their PIN or to use a service/valet mode.