Dallas CARB testing

Clean Truck Check (LINK) , aka CARB inspection aka California Emissions Inspection, is a new initiative from the California Air Resource Board (CARB) that requires heavy-duty vehicles that travel in the state of California to regularly pass electronic emissions inspections. More formally called, Heavy Duty Inspection and Maintenance (HD I/M), Clean Truck Check is an emissions reduction program for heavy-duty, non-gasoline vehicles with a gross vehicle weight rating (GVWR) of over 14,000 pounds.

The program and subsequent inspection requirements (LINK) apply to buses, trucks, agricultural equipment and motorhomes that create a majority of nitrogen oxide and fine particulate matter emissions on the road.

California CleanTruck Check deadlines occur every six months from the last day of the month corresponding to the VIN last digit. See breakdown below.

Last VIN Digit:

0 – April

1 – May

2 – June

3 – Jan

4 – Feb

5 – March

6 – Apr

7 – May

8 – Jun

9 – Jan

All compliance deadlines starting on January 1, 2025 and later will require a passing compliance test to be submitted as part of their compliance demonstration.

Vehicles may submit tests no more than 90 days prior to the vehicle’s compliance deadlines. 

For example, a vehicle with a compliance deadline of February 1, 2025 may submit a passing emissions compliance test as early as November 3, 2024.

Non-compliance may result in DMV registration blocks and other enforcement action.

Clean Truck Check applies to nearly all diesel and alternative fuel heavy-duty vehicles with a gross vehicle weight rating (GVWR) over 14,000 pounds that operate on California public roads and highways even if they are not registered in California. This includes public vehicles (federal, state, and local government); motorcoaches; transit, shuttle and school buses; hybrid vehicles; commercial vehicles; personal vehicles; California registered motorhomes; single vehicle fleets; and vehicles registered outside of California (not including motorhomes).