The following definitions apply to the administration of this chapter. Any term that is not defined in this section must be as defined or described in California Code of Regulations, Title 13, section 1900 or 1963, as applicable. Definitions in California Code of Regulations, Title 13, section 1900 or 1963 will prevail if any discrepancy arises.

(1) "Ecology" means the department of ecology.

(2) "Gross vehicle weight rating" or "GVWR" is the value specified by the manufacturer as the maximum design loaded weight of a single vehicle.

(3) "Light-duty truck" is defined as provided in California Code of Regulations, Title 13, section 1900.

(4) "Medium-duty passenger vehicle" is defined as provided in California Code of Regulations, Title 13, section 1900.

(5) "Medium-duty vehicle" is defined as provided in California Code of Regulations, Title 13, section 1900.

(6) "Model year": Means the manufacturer's annual production period that includes January 1st of a calendar year, or if the manufacturer has no annual production period, the calendar year. The model year for a motor vehicle manufactured in two or more stages is the model year in which the chassis is completed, except for a vehicle subject to California Code of Regulations, Title 13, sections 1963 through 1963.5 (Advanced Clean Trucks): Is defined as provided in California Code of Regulations, Title 13, section 1963(c).

(7) "Manufacturer" means an independent low volume manufacturer, intermediate volume manufacturer, large volume manufacturer, or a small volume manufacturer defined as provided in California Code of Regulations, Title 13, section 1900.

(8) "Passenger car" is defined as provided in California Code of Regulations, Title 13, section 1900.

(9) "Zero-emission vehicle" or "ZEV" is defined as provided in California Code of Regulations, Title 13, section 1962.2(a).