The design of cars is nowadays mainly based on numerical simulations. In oder to improve the robustness of numerical predictions, one introduces a probabilistic model of uncertainties. The uncertainty modelling is based on the use of a non-parametric approach. Application of this non-parametric approach to vehicle-uncertainties modelling shows the sensitivity of the vibroacoustic frequency responses to structural, cavity and vibroacoustic coupling uncertainties and, the sensitivity of the structural modes to structural uncertainties. Since a vehicle is a strongly heterogeneous medium, some parts are more sensitive to uncertainties than others.