Clean Truck Check:

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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.

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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.

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Although heavy-duty vehicles only make up 3% of the vehicles on the state’s roads, CARB says they create over half of the smog-causing pollution and fine particulate matter. Stricter regulations can help reduce these emissions and tackle the state’s hefty air quality problems.

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Clean Truck Check Exemptions:

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Although most heavy-duty vehicles must abide by the CARB Clean Truck Check, some are exempt from the program. The following vehicles do not need to meet these emissions requirements:

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• Zero-emissions vehicles

• Authorized emergency vehicles

• Military tactical vehicles

• Motorhomes registered outside of California

• Historical vehicles

• Vehicles operating under an experimental permit

• New vehicles with engines certified to the most stringent NOx standard (less than or equal to 0.01 g/bhp-hr)

• Gasoline vehicles

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