A content storage system integrates with locking, engine, and other control systems in a vehicle. The system includes a portable storage device comprising a processor, a storage module in electronic communication with the processor, and a wireless communication module. A wireless device is in electronic communication with the wireless communication module of the portable storage device. A transponder is installed in a vehicle configured to transmit a signal on a wire. The wireless device detects the signal on the wire from the transponder and stores the signal. The wireless device is transmits the signal on the wire in response to a command from the portable storage device.