Deterministic communication is currently a fundamental requirement for many real-time systems, such as drive-bywire and autonomous driving solutions; however, in the last few years there has been a sustained increase in the number of other type of on-board connected devices such as actuators, rear vision cameras and multimedia services using different networks on the same vehicle, thus adding weight and complexity. The most efficient solution to this problem is to build a single in-vehicle network to support the delay and bandwidth constraints generated by each type of device. The main goal of this paper is to describe and analyse the performance of a deterministic network management module created to reduce jitter and packet loss, given variable traffic conditions. The most relevant parameters are obtained by simulation work, which permits to establish the actions and policies to execute the prototype modules for this kind of networks.