An OpenSecrets profile details PACCAR Inc's involvement in political finance for the 2024 cycle, with contributions totaling $104,414 and lobbying expenditures of $640,000. The data also reveals that all PACCAR Inc lobbyists in 2023 previously held government positions, raising concerns over a revolving door and potential regulatory capture.

PACCAR's Supplier Code of Conduct, highlighted under the California Transparency in Supply Chains Act, prohibits forced labor and mandates supplier compliance with labor laws regarding working conditions, minimum employment age, and fair compensation. This measure underscores the company's commitment to ethical supply chain practices and supports anti-authoritarian labor standards.

In November 2024, PACCAR released its Supplier Code of Conduct outlining rigorous standards for ethical business conduct. The document mandates that suppliers and sub-suppliers adhere to strict guidelines covering labor and human rights, environmental safeguards, responsible sourcing, and supply chain transparency, reinforcing the company’s commitment to fair labor practices and ethical supply chain operations.

PACCAR Inc, through its subsidiary PACCAR of Canada, released its report detailing compliance with the Canada Supply Chains Act. The report outlines stringent supplier conduct, mandatory training on forced and child labour prevention, and rigorous due diligence processes to ensure ethical supply chain management and labor practices.

Investors, led by Calvert Research, pressed for an annual report on PACCAR's lobbying and policy efforts aligned with the Paris Agreement. Nevertheless, PACCAR’s board recommended shareholders vote against the proposal, defending its current reporting practices and claiming that the company is already a global environmental leader.

Paccar Inc. has partnered with Cummins, Daimler, and other companies in a joint venture to establish a U.S. EV battery plant. The project, estimated to cost $2-3 billion for a 21-gigawatt hour capacity facility, aims to create domestic jobs, boost sustainable manufacturing, and advance green technology in battery production.

Analysis from InfluenceMap revealed that in June 2023, PACCAR, along with other truck manufacturers, opposed increasing the ambition of existing Phase 2 emissions standards during the EPA public comment period, an action that contributed to weakening environmental regulations aimed at reducing truck-related diesel pollution.

On May 2, 2023, PACCAR and Toyota Motor North America announced an expansion of their joint efforts to develop and commercialize zero emissions, hydrogen fuel cell-powered Kenworth and Peterbilt trucks, with initial deliveries planned for 2024. This builds on previous pilot programs and advances the use of sustainable fuel cell technology in heavy-duty trucks.

PACCAR's board of directors has strongly opposed a shareholder proposal—initiated by Calvert Research and Management—to publicly disclose how the company's lobbying activities align with the Paris Agreement. The board claimed that PACCAR’s current sustainability efforts and environmental scorecards sufficiently demonstrate its commitment, urging shareholders to vote against the disclosure measure at the upcoming annual meeting on April 25, 2023.

On March 30, 2023, PACCAR announced a minority equity investment in its connected truck partner, Platform Science, aimed at integrating Virtual Vehicle technology with the PACCAR Connect telematics system. This initiative is designed to offer enhanced connectivity, real‐time vehicle data, and streamlined telematics solutions to improve customer productivity and operational efficiency.