Most likely you will need to fix or replace the module.
The problem is that the body control modul (BCM), is programmed with the imobilaizer located on the ignition switch, transmitter inside your key, and with the ECU located in the trunk.
So you have few options (in order of what I whould do if I had that prablem)
1. You can find a set on eBay for 400-600 from a dismantled car, and replace the components yourself.
porsche boxster computer | eBay
2. Send the module for repair. There is a company here in Florida that can do that.
Not sure how much it cost and I do not remember their name at the moment, but I'll find out for you.
3. Buy new BCM at the dealership and have them program it to the car.
Hope it helps.