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In the present study, we performed ab initio calculations for tin carbide codoped with (V,Mn), (V,Cu) and (V,Fe). The electronic and magnetic properties of tin carbide are calculated by means of density functional theory (DFT). The half metallic ferromagnetic behaviour of dual impurities VMnSnC, VFeSnC and VCuSnC is treated by using the Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA). Our results evince that, the stability of ferromagnetism state was induced by the charge state of magnetic impurities, which room temperature ferromagnetic DMS based spintonic is realized. The exchange interactions are obtained from first principles calculations using an Ising model. Our calculation is supported by Monte Carlo simulation based on the heat bath algorithm. We have examined the effects of magnetic parameters for magnetization, internal energy and magnetic susceptibility.