This study focuses on the development of a virtual methodology for the evaluation of the efficiency of an EDM (Electric Drive Module), with a focus on the mechanical characteristics, i.e, the loss that arises in the reduction unit needed to adapt the Electric Motor (EM) characteristics to the vehicle requirements that are commonly split into load losses and non-load losses, depending on their variability with the applied torque. Two units, a test reducer and the EDM of the Fiat 500 Battery-Electric Vehicle (BEV), are modelled with different levels of complexity by using three simulation software tools available in the market (MASTA, AVL Excite and Romax).