California’s Clean Truck Check Program is a statewide inspection and maintenance program created by the California Air Resources Board (CARB). The program requires most heavy-duty diesel and alternative-fuel vehicles operating in California to undergo routine emissions testing to ensure their emissions control systems are working properly.
The purpose of the program is to identify vehicles that produce excessive pollution, require needed repairs, reduce harmful air emissions, and ensure that all heavy-duty trucks meet the same environmental standards.
The program applies to:
Vehicles with a Gross Vehicle Weight Rating (GVWR) over 14,000 pounds
Almost all non-gasoline vehicles, excluding zero-emission vehicles
Vehicles that operate on California public roads and highways, even if registered out of state
Federal, state, and local government vehicles operating in California