With the density of electronics in automobiles increasing each year, it is important to ensure that in-vehicle networks maintain a high level of performance with respect to electromagnetic compatibility (EMC). This ensures that various sub-systems will continue to function as intended when integrated into a larger solution and operated in a typical (noisy) environment. Although there are many different in-vehicle networking standards and a variety of different EMC requirements from automotive original equipment manufacturers (OEMs), this paper focuses on a topic that has proved to be particularly challenging: radio frequency (RF) emissions from a controller area network (CAN) bus.