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This paper proposes a hybrid carrier spread spectrum modulation (HCSM) technique based on dynamically adjusting the spatial zero-vectors action time to suppress the sideband vibro-acoustic responses introduced by the discontinuous pulse-width modulation (DPWM) in permanent magnet synchronous motor (PMSM) for electric vehicles (EVs). Firstly, the space vector principle of DPWM is presented, and the relationship between current harmonics and space zero-vectors is analyzed. Then, the HCSM technique is proposed to suppress the current harmonics and vibro-acoustic responses based on the variation trend of zero-vectors action time in six sectors, and the suppression effect of HCSM on sideband components is predicted by the finite element method. Finally, with a 12-slots/10-poles prototype PMSM, the sideband vibro-acoustic responses and the electric drive system loss caused by DPWM and classical space vector pulse-width modulation (SVPWM) before and after using HCSM are analyzed.