Internal tides are generated in the stratified ocean interior by the interaction of barotropic tidal currents with rough bathymetry. Low-vertical-mode internal tides can transport energy thousands of kilometres from their generation site, and how and where they eventually lose this energy to turbulent dissipation and mixing is of importance to the oceanic energy budget. A potential mechanism for the transfer of energy from the low-mode internal tide to smaller scales is superharmonic generation, whereby internal tides in equatorial regions and non-uniform stratification excite waves with shorter wavelengths and higher frequencies. Here, we use a realistic global ocean model to investigate an enhanced superharmonic tidal signal in the equatorial Pacific Ocean. Using existing theory, we demonstrate that the superharmonic amplitude is consistent with nonlinear self-interaction of the original 'parent' baroclinic tide, providing strong evidence for an energy pathway from the mode-1 M2 internal tide to smaller horizontal scales and higher frequencies.