Eligibility checker
Who Needs a CARB Emissions Test
Clean Truck Check eligibility means whether a heavy-duty vehicle over 14,000 lbs GVWR that operates in California needs a periodic CARB emissions test. Out-of-state trucks that enter California, plus many motorhomes and agricultural vehicles, can be covered. This unofficial checker is independent — not CARB.gov — and does not issue the official certificate.
Last updated . Educational estimate only. Confirm each vehicle on CARB’s Clean Truck Check overview. CARB Test Finder does not issue the official certificate.
How to check
How to check Clean Truck Check eligibility
Answer four questions about GVWR, California use, vehicle class, and fuel. Then review the unofficial estimate and the next step.
Read the GVWR
Find Gross Vehicle Weight Rating on the driver-door sticker. Clean Truck Check uses a 14,000 lbs cutoff.
Confirm California use
Say whether the vehicle is California-plated, enters California from another state, or never operates here.
Choose the vehicle class
Pick heavy-duty truck, bus, motorhome, agricultural, or passenger / light-duty.
Identify the fuel
Diesel, hybrid, and other combustion fuels are treated differently from battery-electric or hydrogen fuel cell.
Review the estimate
Read the unofficial result, then find a tester or file after you pass. Confirm each unit with CARB.
Coverage
Who needs Clean Truck Check coverage
Use this table as a starting point. Confirm each vehicle on CARB’s overview rather than treating the quiz as a legal determination.
| Question | Often covered | Usually not CTC | Confirm first |
|---|---|---|---|
| Weight | GVWR over 14,000 lbs | At or under 14,000 lbs | Door sticker missing or unreadable |
| Where it operates | California-plated, or out-of-state trucks that enter California | Never operates in California | Occasional trips into the state |
| Vehicle class | Heavy-duty trucks, buses, motorhomes, agricultural units over the cutoff | Passenger cars and light-duty BAR Smog Check vehicles | Specialty bodies or mixed-use fleets |
| Fuel | Diesel, hybrid, and other combustion fuels | Battery-electric and hydrogen fuel cell (typically exempt) | Unknown powertrain or dual-fuel setups |
Out-of-state trucks
Out-of-state trucks that enter California
A heavy-duty vehicle over 14,000 lbs GVWR that enters California must meet Clean Truck Check even when the plates are from another state. Register in CTC-VIS, keep testing current, and pay the annual fee before operating here.
FAQ
Clean Truck Check eligibility FAQs
Short answers on Clean Truck Check eligibility, the 14,000 lbs GVWR rule, out-of-state trucks, and motorhomes. This checker is unofficial — not CARB.gov.
Most heavy-duty vehicles over 14,000 lbs GVWR that operate in California need a periodic Clean Truck Check emissions test. Coverage still depends on fuel type, vehicle class, and how the unit is used. Confirm each vehicle rather than relying on a general summary.