DTC P0500: Vehicle Speed Sensor: Description
WARNING: This page is about a different car, the 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
The vehicle speed signal is sent to the combination meter from the VDC/TCS/ABS control unit by the Controller Area Network (CAN) communication line. The combination meter then sends a signal to the ECM by the CAN communication line.