The California Air Resources Board (CARB) said it would delay the first periodic testing deadline for its Clean Truck Check Program to January 1, 2025. 

This does not delay requirements to register and pay fees for 2023. 

CARB’s Clean Truck Check program replaces the state's current Periodic Smoke Inspection Program (PSIP).

It requires non-gasoline (diesel, alternative fuel, and hybrid) trucks, buses, and other heavy-duty vehicles (such as California-registered motorhomes) with a gross vehicle weight rating over 14,000 pounds to undergo emissions testing if they operate in California, regardless of the state in which they are registered.

The Clean Truck Check Program is comprised of three phases, the first of which started in January with the use of with remote emissions monitoring technologies. The second phase, in effect since Feb. 1, required all eligible vehicle owners to register with CARB’s Clean Truck Check database and pay an annual $30 compliance fee per vehicle. The third phase, which is now delayed to 2025 but was originally planned to take effect this summer, requires the owners of heavy trucks to undergo periodic emissions testing similar to California’s passenger car Smog Check program.