Vauxhall Tigra HELP!!

Hi there, can anyone help me out? I have an 'N' reg Vauxhall Tigra 1.6i MTV edition. It has broke down today and i have been told it has an error with the code '63'. Suspected ECU wiring loom problem. If this makes sense to anyone please could let me know how bad the problem might be and what the average cost is. I am having to wait a week for a garage to take a proper look.
Cheers!