Immobiliser on a Ve series 2 sedan 2012 how do I bypass the immobiliser and security alarm

You cannot bypass it which is why the security system is there. If you have a problem with the security system then you will need to transport the car to a Holden service center to rectify it for you. If you start messing with the system you will make your current problem worse. Contact Holden service and explain the problem exactly and they will advise you from there.

If you go to the boot and open the battery compartment on the left side of the boot in the sedan and disconnect the negative battery terminal for a few minutes the system may correct itself when you reconnect the power. If not, then it is off to Holden service to deal with the security issue.