Assembly Member Aguiar-Curry's proposal to modify California's Heavy-Duty Vehicle Inspection and Maintenance Program establishes a firm deadline of February 1, 2026, for the State Air Resources Board to publish its first biennial assessment of the program's implementation. This amendment adjusts the existing requirement, which mandates two biennial reports within four years of the program's launch.

The program oversees emissions testing and compliance for nongasoline heavy-duty vehicles weighing more than 14,000 pounds that operate on California roads. Under the program, vehicles must pass emissions tests measuring nitrogen oxide and particulate matter levels to maintain registration. The legislation includes provisions for electronic data submission options for fleet operators with established compliance records, while maintaining core testing requirements. Certain vehicles receive automatic exemptions, including zero-emission vehicles, emergency response vehicles, military tactical vehicles, and newly certified low-emission vehicles during their first four years of operation.

The State Air Resources Board maintains authority to conduct inspections at various locations, including private fleet facilities and in coordination with California Highway Patrol safety checks. Vehicle owners cited for violations receive at least 45 days to address deficiencies, with agricultural vehicles allowed a minimum of 75 days. The program incorporates an administrative hearing process for citations and establishes mechanisms for out-of-state vehicles to verify compliance before entering California.