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Identify vehicles subject to the regulation Based on Regulation Adopted on April 25, 2014

The California Air Resources Board (ARB) has a web portal to the truck and bus regulation including instructions for how to report, compliance tools, and a list of FAQs. See:

Truck and Bus Regulation On-Road Heavy-Duty Diesel Vehicles (In-Use) Regulation

Vehicles subject to California Air Resources Board’s Truck and Bus regulation:

The following vehicles are exempt from the Truck and Bus regulation.

1ARB says the gross vehicle weight rating (GVWR) is issued by the vehicle manufacturer and is the weight of the vehicle plus fuel, passengers, cargo, and trailer tongue weight. It may sometimes be listed as gross weight. The GVWR is not the same as the unladed weight, gross combined weight rating, towing weight rating or registered weight rating. The manufacturer's original GVWR label is commonly found on the truck door jamb or on the inside of the door.