Purpose – The purpose of this paper is to investigate how technology-forcing regulations affect the product development process in the supply chain of heavyweight vehicles. Design/methodology/approach – Through a case study, this paper seeks to understand how one of the leading companies in heavyweight vehicles manufacturing industry and its engine supplier in Brazil introduce eco-design practices into its engine development process. Findings – Through case studies conducted in a heavyweight vehicle producer and its engine supplier, this study shows that, in addition to meeting the standards and legislation, the automaker uses ecodesign practices during the product development cycle such as a design that eliminates harmful and hazardous materials and a project that allows recycling, the reuse of parts and energy efficiency, thereby reducing the environmental impact. However, without the mandatory requirements imposed by federal legislation, products with lower environmental impacts would rarely be developed, as environmental performance is not demanded by customers, who are mainly cost driven. Technology-forcing regulations play an important role in enhancing the adoption of ecodesign practices, but market and competitive conditions also play an important role. Originality/value – Several studies on the impacts of public policies and development for the automobile sector have been conducted, but there is a lack of studies in the area of commercial vehicles, especially in Brazil. Therefore, this research is justified by new demands of society, in addition to the necessity of complying with legal requirements and the adoption of good practices related to eco-design.