A network such as an in-vehicle powerline communication (PLC) network may allow PLC nodes to communicate over existing powerlines. Provided in the present disclosure are exemplary techniques for synchronizing network nodes (e.g., PLC nodes) with a network clock for the network so that data generated at each node may share a common time reference. For example, a synchronization (sync) signal may be generated by a master node and broadcast to other PLC nodes over a PLC channel, which may also carry data frames to and from other PLC nodes. The network clock may be autonomously generated by the master node or may be tied to an external clock.