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A Rover car equipped with a Controller Area Network (CAN) system was tested for radio frequency susceptibilities in the Electromagnetic Compatibility (EMC) chamber at Rover Gaydon Test Centre. The system consisted of four electronic control units linked together using a serial network (CAN) to share signal information. The car was configured in turn with two different types of twisted pair wire and a flat pair for the CAN data bus. Each type of wire was tested in the chamber at a range of frequencies and with various antenna positions. The CAN data was collected and stored on a commercially available personal computer (PC) based network analyzer for later analysis to determine bus latency under EMC error conditions.