obdII codes on 2005 Mitsubishi Galant

hi when i try to use the scanner i keep getting data link error what does this mean and what do i do to get the codes so i know whats wrong with this car thanks

Asked by for the 2005 Mitsubishi Galant
You are having connection problems between the diagnostic link and the scanner. You could have a blown fuse or wiring probs. You may also have a failed computer.