How do i reset the Chrysler 300 immobilizer?

To reset the immobilizer on the Chrysler 300 You need to turn the key to the on position for 10 seconds, then the off or lock position for 10 seconds. Repeat this, then turn the vehicle on and it will be reset. An immobilizer or immobilizer is an electronic security device fitted to a motor vehicle that prevents the engine from running unless the correct key (transponder or smart key) is present. This prevents the vehicle from being "hot wired" after entry has been achieved and thus reduces motor vehicle theft.Many immobilizer problems can be fixed simply by simply replacing the battery in the key fob. Many transponder keys depend on a small battery to relay the security code to the car immobilizer. Be careful replacing the battery so You don't accidentally damage the transponder chip inside.