Creates the Government Zero Emission Vehicle Act. Defines terms. Provides that all vehicles owned by a governmental unit must either be a manufactured zero-emission vehicle or converted into a zero-emission vehicle no later than January 1, 2045. Requires the Environmental Protection Agency to adopt rules to implement the Act. Provides that the rules may include requirements for all governmental units to gradually reduce the percentage of vehicles that are not zero-emission vehicles up through January 1, 2045. Limits the concurrent exercise of home rule powers. Amends the State Mandates Act to require implementation without reimbursement. Senate Committee Amendment No. 1 Replaces everything after the enacting clause. Reinserts the provisions of the introduced bill with the following changes. Removes language providing that any vehicle owned by a governmental unit must either be a manufactured zero-emissions vehicle or converted into a zero-emissions vehicle no later than January 1, 2045. Establishes that all vehicles purchased or leased by a governmental unit after January 1, 2025, must be a zero-emissions vehicle or converted zero-emissions vehicle. Provides that a "zero-emissions" vehicle means a passenger (rather than a passenger and commercial) motor vehicle that produces zero exhaust emissions of any criteria pollutant, precursor pollutant, or greenhouse gas, but only produces water vapor, in any mode of operation or condition, as determined by the Agency. Requires the Environmental Protection Agency to adopt rules to implement and enforce the Act. Senate Floor Amendment No. 6 Deletes reference to: 30 ILCS 805/8.47 new Replaces everything after the enacting clause with the provisions of Senate Amendment No. 5, and makes the following change: Removes the changes made to the States Mandates Act. Senate Floor Amendment No. 7 Provides that, notwithstanding any other provision of law, beginning on January 1, 2030, all passenger vehicles, except law enforcement vehicles, purchased or leased by a governmental unit must either be a manufactured zero-emissions vehicle or a converted zero-emissions vehicle. House Floor Amendment No. 2 Replaces everything after the enacting clause with the provisions of the engrossed bill, and makes the following change: Provides that "passenger vehicle" does not include vehicles purchased by the Department of Transportation as part of their consolidated vehicle procurement program.