This paper investigates the world of diesel electronic engine controls in the North American heavy duty truck market. Topics include features, applications, attitudes, potential problems, responsibilities, and solutions. This paper deals with the impact that electronic engine controls will possibly have on the heavy duty truck market. As many papers have been written on specific electronic engine control systems, it is not the intent of this paper to probe into great detail on the technical highlights or the theory of electronic engine controls. The opinions expressed in this paper reflect those of the authors, other truck OEM's, truck users, and suppliers of electronic engine controls.