In recent years, the proliferation of electronic systems in modern cars has resulted in increased cost, complexity, and weight of the automotive wire harness. Moreover, the addition of nodes in to the existing wire harness, to provide additional functions, leads to an enormous routing effort. Power Line Communication (PLC) provides an attractive solution to these problems by providing an alternative medium of communication between the nodes through the vehicle's battery power line. In this work, a new transceiver architecture is proposed to provide PLC on the DC line in an automotive harness. The proposed scheme is based on the example of the Local Interconnect Network (LIN) where only the physical layer is changed. Here, we propose to use redundant transmission channels, which are spaced in frequency, to provide robustness against the severe power line channel attenuation. An improvement in channel gain for the worst-case scenarios is demonstrated through a statistical evaluation of this scheme. The results show that an efficient use of the frequency spectrum enables the support of up to 15 LIN buses on a single power line, while ensuring 3-level redundancy. A system-level design of the PLC system for LIN and its specifications are presented. A further improvement in the system performance in the presence of impulsive noise is demonstrated by applying simple channel coding techniques.