The City Lightweight and Innovative Cab (CLIC) project is a scientific collaboration gathering public and private organizations. The aim is to propose an innovative lighten truck cab, where a high strength steel is used. As long as it could affect directly the acoustic environment of the cab, it is necessary to be able to simulate the vibroacoustic behavior of a truck cab in the mid frequency range. SmEdA (Statistical modal Energy distribution Analysis) method allows us substructuring the global problem, to study the interaction between the floor and the interior cavity. The process consists in building finite element models (FEM) of each subsystem (floor, internal cavity), including the dissipative material (damping layer, poroelastic material). Standard modal FEM calculations are then performed for each uncoupled subsystem. From the spatial mode shapes, and the modal strain and kinetic energies, the modal loss factors of both subsystems are estimated. Finally, the pressure levels inside the cavity are deduced from the resolution of the SmEdA equations. This process allows us taking into account the dissipative energy effects. To validate it, the cab is excited at the truck frame links, and the pressure levels on the driver’s ears are compared between numerical and experimental results.