The aim of this study was to ascertain the downstream signaling events, after EGFR engagement, and ultimately the mechanism responsible for increased TRPM6 activity. Elucidation of the molecular details responsible for EGFR-mediated stimulation of TRPM6 will facilitate the development of treatments for hypomagnesemia in general and during cetuximab treatment. Using electrophysiologic measurements in combination with biochemical and live cell imaging techniques, we provide evidence that EGF stimulates TRPM6 through the specific activation of the EGFR. This activates the Src family of tyrosine kinases and the small Rho-GTPase, Rac1, which results in a redistribution of vesicular TRPM6 to the plasma membrane.