In 2021, the California state senate passed a bill instructing CARB to develop regulations to ensure the emissions control systems of heavy-duty vehicles were functioning properly on state highways. The program includes expanded emissions monitoring, mandatory vehicle registration, and increased vehicle testing. The program affects diesel and alternative fuel heavy-duty vehicles with a GVWR of over 14,000 pounds. CTC applies to any vehicle operating in California including trucks registered in other states.

The first step in Clean Truck Check compliance is registering every vehicle in your fleet in the CTC-VIS database. If your vehicle was operating in California in 2023, you must pay a $30 compliance fee for that year (the deadline for the 2023 payment was January 31, 2024). For 2024, if a truck’s compliance deadline falls between July and December, another compliance fee will be due for the year.

The compliance deadline for vehicles registered in California matches their DMV registration expiration/renewal date. Vehicles registered outside of California have a compliance deadline based on the last number of their VIN. You can find more information about this schedule on the CARB website.