Vauxhall Corsa 1.2 twin registered 2006 - Car will not start - scottboy

Parked car which was running fine. On returning car will not start. Diagnostic check revealed code P0560 System Voltage Low Input C-04. Fuel pump not working but was replaced by a new one. Still the same problem and code showing. Can anyone explain the the proceedure for checking this fault. Is a battery fault, earth fault or ecu fault?

Regards:

Scottyboy: