This bill mandates the National Highway Traffic Safety Administration (NHTSA) to develop and publish comprehensive guidelines for advanced driver assistance systems (ADAS) and vehicle dynamic systems. These guidelines aim to ensure ADAS functionality is maintained in passenger motor vehicles from model year 2028 and beyond, even after modifications or customizations. NHTSA must consult with various stakeholders, including manufacturers, standard setting organizations, and the independent automotive aftermarket, to develop these standards within 24 months. The guidelines will specify allowable modification ranges and tolerances for physical parameters like ride height, wheel and tire dimensions, and static geometry, which impact ADAS functionality. They will also mandate a process for manufacturers to provide vehicle tolerance and system sensitivity information. Additionally, the guidelines will establish quantifiable tolerance thresholds for vehicle displacement changes, proper calibration procedures for ADAS after repair or modification, and confirmatory test protocols to verify operational integrity. All determinations must be based on empirical data and incorporate methodologies from the United States New Car Assessment Program (NCAP). The bill also requires NHTSA to complete a study within 12 months, assessing the feasibility and cost of developing and maintaining these industry guidelines. Manufacturers failing to meet the established guidelines will face civil penalties, reinforcing the importance of maintaining ADAS integrity post-modification.