Gr-plc has been used to research the feasibility of in-vechicle powerline communication.
A video demonstrating gr-plc experimentation in a car is shown below.
Setup:
Car model: 2006 Pontiac Solstice
Communication between cigarette lighter to front light
512 OFDM carriers between 6.25MHz to 18.75MHz, -80 dBm/Hz PSD
Front-end equipment: 2 Ettus USRP N210 with LFRX/LFTX, 2 bias tees to block DC component, amplifier in the transmitter