The mechanism for the superconductivity observed in quasi-1D Sc3CoC4 has been investigated with density functional theory. No evidence supporting a charge density wave distortion in the superconducting state was found. Instead, the conventional phonon-mediated theory was shown to be valid. Solutions to Eliashberg equations for partitioned vibrational modes permit the characterization of important electron-phonon processes. The superconducting state is the result of interactions between the electronic structure with the lattice vibrations and the dicarbo-C2 librations.