CARB Clean Truck Check Compliance Checker
Heavy-duty, non-gasoline vehicles over 14,000 lbs GVWR now face twice-yearly emissions testing — see if yours is covered.
If your vehicle is diesel, alternative fuel, or hybrid, weighs over 14,000 lbs GVWR, and operates on California roads, it's almost certainly covered by Clean Truck Check — testing twice a year in 2026, at an annual compliance fee of about $32.13.
Enter your vehicle's fuel type and weight rating to check coverage.
Clean Truck Check Compliance Checker
Clean Truck Check Result
How this is calculated
Coverage requires two things together: a non-gasoline fuel type (diesel, alternative fuel, or hybrid) and a gross vehicle weight rating over 14,000 lbs. A gasoline-only vehicle, or any vehicle at or below that weight threshold, generally falls outside Clean Truck Check (though it may still be subject to the regular smog check program instead).
Covered vehicles owe an annual compliance fee of about $32.13 and must complete OBD-based testing 2 times per year in 2026, a frequency CARB plans to raise to 4 times per year for many vehicles in 2027. This applies even to out-of-state trucks operating on California roads, not just California-registered vehicles.
Frequently Asked Questions
Which vehicles must comply with California's Clean Truck Check program?
Almost all non-gasoline heavy-duty vehicles — diesel, alternative fuel, and hybrid — with a gross vehicle weight rating over 14,000 lbs that operate on California roads, even if the vehicle isn't registered in California.
How much does Clean Truck Check compliance cost?
The annual compliance fee is about $32.13 per vehicle as of 2026, on top of any testing equipment or third-party testing costs.
How often do trucks need to be tested?
Most covered heavy-duty trucks must complete testing twice a year in 2026. CARB has signaled plans to increase this to four times a year for many vehicles in 2027.
Does Clean Truck Check apply to out-of-state trucks?
Yes. Any covered heavy-duty vehicle operating on California public roads is subject to the program, regardless of where it's registered.
What replaced the old Periodic Smoke Inspection Program (PSIP)?
Clean Truck Check replaced PSIP with more rigorous OBD-based (onboard diagnostics) testing for most covered vehicles, rather than just a visual smoke opacity check.
This tool provides an educational estimate only and is not affiliated with CARB. Confirm your vehicle's exact compliance deadlines and testing method at ww2.arb.ca.gov before your next filing.