What is Clean Truck Check?

Clean Truck Check is an initiative from the California Air Resource Board (CARB) that requires heavy-duty vehicles that travel in the state of California to regularly submit electronic emissions inspections. This includes both in-state and out-of-state vehicles that operate on California public roads.

More formally called Heavy Duty Inspection and Maintenance (HD I/M) — Clean Truck Check is an emissions-reduction program for diesel and alternative fuel heavy-duty vehicles with a gross vehicle weight rating (GVWR) over 14,000 pounds. HD I/M applies to the trucks, buses, and motorhomes that create a majority of the emissions on the road.