What is California Clean Truck Check?

Clean Truck Check is a California Air Resources Board (CARB) inspection and maintenance program for heavy-duty diesel vehicles. The program requires periodic testing of eligible trucks to verify that emission control systems are functioning correctly. Trucks that fail testing may be required to undergo repairs. The program is designed to reduce harmful emissions from commercial vehicles operating in California.

Who needs Clean Truck Check testing?

Clean Truck Check testing applies to certain heavy-duty diesel trucks and other qualifying commercial vehicles operating in California. Owner-operators, trucking companies, fleet operators, and businesses operating qualifying heavy-duty vehicles may be subject to testing requirements. Contact ACT or review CARB's official program documentation for vehicle-specific eligibility details.

How often do trucks need Clean Truck Check testing?

Most vehicles subject to California’s Clean Truck Check program require emissions compliance testing twice per year (every six months). Beginning in 2027, testing frequency generally increases to four times per year (quarterly) for applicable vehicles. Certain vehicles and situations may have different requirements, so owners and fleet operators should verify their specific compliance schedule with CARB.

OBD stands for On-Board Diagnostics. OBD testing involves connecting diagnostic equipment to a vehicle's onboard computer to read emissions-related data and identify fault codes or system issues. OBD testing is one of the methods used in Clean Truck Check inspections for qualifying vehicles. ACT provides OBD testing as part of its mobile testing services — learn more at /obd-testing.

What vehicles are subject to Clean Truck Check testing?

California’s Clean Truck Check program generally applies to non-gasoline heavy-duty vehicles with a gross vehicle weight rating (GVWR) over 14,000 pounds that operate on California public roads. This can include diesel trucks, buses, motorhomes, and other heavy-duty commercial vehicles. Certain exemptions apply, so vehicle owners should confirm their specific requirements with CARB.

Does ACT provide mobile Clean Truck Check testing?

Yes. Air Compliance Testing (ACT) is a mobile Clean Truck Check testing provider. Instead of requiring truck owners to drive to a fixed testing facility, ACT's credentialed technicians travel to qualifying customer locations to perform testing on-site. Mobile testing reduces downtime and simplifies compliance scheduling for both individual trucks and commercial fleets.

Can ACT test trucks at my business?

Yes. ACT provides on-site mobile testing at qualifying business locations, fleet yards, truck yards, and other appropriate locations throughout California. When you schedule testing with ACT, we confirm the testing location during the scheduling process. To get started, visit /request-a-quote or /schedule-testing.

Can ACT test an entire fleet?

Yes. ACT offers fleet Clean Truck Check testing for commercial fleets of all sizes. Fleet testing allows multiple trucks to be tested during a single coordinated visit, reducing operational disruption. ACT provides volume pricing for qualifying fleets and can assist with centralized scheduling and future testing reminders. To request fleet pricing, visit /fleet-clean-truck-check-testing.

Does ACT test individual owner-operator trucks?

Yes. ACT welcomes individual truck owners and owner-operators. Whether you operate one truck or several, ACT can schedule mobile testing at a qualifying location convenient for you. Individual truck pricing starts at $150 per truck for three trucks or fewer. Contact ACT for current pricing and scheduling availability.

What areas of California does ACT serve?

ACT provides mobile Clean Truck Check testing throughout California, with active service in markets including Sacramento, the Bay Area, Stockton, Modesto, Elk Grove, Roseville, Vacaville, Fairfield, Vallejo, Concord, Oakland, San Jose, Fremont, Hayward, and Richmond, among others. View the full service area at /service-areas.

How much does Clean Truck Check testing cost?

ACT's pricing starts at $150 per truck for testing three trucks or fewer. Fleet volume pricing is available for qualifying fleets with larger vehicle counts. For an accurate quote based on your specific number of trucks, vehicle types, and testing location, request a quote at /request-a-quote. Contact ACT for current pricing — rates are subject to change.

Does ACT offer fleet discounts?

Yes. Fleet volume pricing is available for qualifying fleets. The more trucks tested during a single coordinated visit, the greater the potential savings per truck. To request a fleet quote, visit /fleet-clean-truck-check-testing or submit a request at /request-a-quote.

Are cash discounts available?

Cash discounts may be available. Contact ACT directly for current pricing, payment options, and any available discounts. Pricing and discount availability are subject to change.

How do I schedule testing?

Scheduling is straightforward. Visit /schedule-testing to submit your contact information, number of vehicles, testing location, and preferred date. ACT will confirm your appointment, pricing, and logistics. You can also request a quote first at /request-a-quote or call/text ACT directly for faster coordination.

How long does testing take?

Testing time varies depending on the number of trucks, vehicle type, and testing method required. ACT can provide estimated time expectations during the scheduling process based on your specific fleet size and vehicle details.

Can multiple trucks be tested during one appointment?

Yes. One of the primary benefits of ACT's mobile fleet testing service is the ability to test multiple trucks during a single on-site visit. This minimizes operational disruption and reduces the total time spent on compliance testing. Fleet customers are encouraged to coordinate all qualifying vehicles for a single scheduled visit when possible.

What information do I need before scheduling?

Before scheduling, it helps to have the following ready: your name and company name, a contact phone number and email, the number of trucks requiring testing, the vehicle types and model years (if known), your preferred testing location or ZIP code, and a preferred testing date. ACT will work with you to confirm details and finalize scheduling. Visit /schedule-testing to get started.

Clean Truck Check & CARB Testing | Air Compliance Testing

What is California Clean Truck Check?
Clean Truck Check is a California Air Resources Board (CARB) inspection and maintenance program for heavy-duty diesel vehicles. The program requires periodic testing of eligible trucks to verify that emission control systems are functioning correctly. Trucks that fail testing may be required to undergo repairs. The program is designed to reduce harmful emissions from commercial vehicles operating in California.
Who needs Clean Truck Check testing?
Clean Truck Check testing applies to certain heavy-duty diesel trucks and other qualifying commercial vehicles operating in California. Owner-operators, trucking companies, fleet operators, and businesses operating qualifying heavy-duty vehicles may be subject to testing requirements. Contact ACT or review CARB's official program documentation for vehicle-specific eligibility details.
How often do trucks need Clean Truck Check testing?
Most vehicles subject to California’s Clean Truck Check program require emissions compliance testing twice per year (every six months). Beginning in 2027, testing frequency generally increases to four times per year (quarterly) for applicable vehicles. Certain vehicles and situations may have different requirements, so owners and fleet operators should verify their specific compliance schedule with CARB.
What is OBD testing?
OBD stands for On-Board Diagnostics. OBD testing involves connecting diagnostic equipment to a vehicle's onboard computer to read emissions-related data and identify fault codes or system issues. OBD testing is one of the methods used in Clean Truck Check inspections for qualifying vehicles. ACT provides OBD testing as part of its mobile testing services — learn more at /obd-testing.
What vehicles are subject to Clean Truck Check testing?
California’s Clean Truck Check program generally applies to non-gasoline heavy-duty vehicles with a gross vehicle weight rating (GVWR) over 14,000 pounds that operate on California public roads. This can include diesel trucks, buses, motorhomes, and other heavy-duty commercial vehicles. Certain exemptions apply, so vehicle owners should confirm their specific requirements with CARB.

Does ACT provide mobile Clean Truck Check testing?
Yes. Air Compliance Testing (ACT) is a mobile Clean Truck Check testing provider. Instead of requiring truck owners to drive to a fixed testing facility, ACT's credentialed technicians travel to qualifying customer locations to perform testing on-site. Mobile testing reduces downtime and simplifies compliance scheduling for both individual trucks and commercial fleets.
Can ACT test trucks at my business?
Yes. ACT provides on-site mobile testing at qualifying business locations, fleet yards, truck yards, and other appropriate locations throughout California. When you schedule testing with ACT, we confirm the testing location during the scheduling process. To get started, visit /request-a-quote or /schedule-testing.
Can ACT test an entire fleet?
Yes. ACT offers fleet Clean Truck Check testing for commercial fleets of all sizes. Fleet testing allows multiple trucks to be tested during a single coordinated visit, reducing operational disruption. ACT provides volume pricing for qualifying fleets and can assist with centralized scheduling and future testing reminders. To request fleet pricing, visit /fleet-clean-truck-check-testing.
Does ACT test individual owner-operator trucks?
Yes. ACT welcomes individual truck owners and owner-operators. Whether you operate one truck or several, ACT can schedule mobile testing at a qualifying location convenient for you. Individual truck pricing starts at $150 per truck for three trucks or fewer. Contact ACT for current pricing and scheduling availability.
What areas of California does ACT serve?
ACT provides mobile Clean Truck Check testing throughout California, with active service in markets including Sacramento, the Bay Area, Stockton, Modesto, Elk Grove, Roseville, Vacaville, Fairfield, Vallejo, Concord, Oakland, San Jose, Fremont, Hayward, and Richmond, among others. View the full service area at /service-areas.

How much does Clean Truck Check testing cost?
ACT's pricing starts at $150 per truck for testing three trucks or fewer. Fleet volume pricing is available for qualifying fleets with larger vehicle counts. For an accurate quote based on your specific number of trucks, vehicle types, and testing location, request a quote at /request-a-quote. Contact ACT for current pricing — rates are subject to change.
Does ACT offer fleet discounts?
Yes. Fleet volume pricing is available for qualifying fleets. The more trucks tested during a single coordinated visit, the greater the potential savings per truck. To request a fleet quote, visit /fleet-clean-truck-check-testing or submit a request at /request-a-quote.
Are cash discounts available?
Cash discounts may be available. Contact ACT directly for current pricing, payment options, and any available discounts. Pricing and discount availability are subject to change.
How do I schedule testing?
Scheduling is straightforward. Visit /schedule-testing to submit your contact information, number of vehicles, testing location, and preferred date. ACT will confirm your appointment, pricing, and logistics. You can also request a quote first at /request-a-quote or call/text ACT directly for faster coordination.
How long does testing take?
Testing time varies depending on the number of trucks, vehicle type, and testing method required. ACT can provide estimated time expectations during the scheduling process based on your specific fleet size and vehicle details.
Can multiple trucks be tested during one appointment?
Yes. One of the primary benefits of ACT's mobile fleet testing service is the ability to test multiple trucks during a single on-site visit. This minimizes operational disruption and reduces the total time spent on compliance testing. Fleet customers are encouraged to coordinate all qualifying vehicles for a single scheduled visit when possible.
What information do I need before scheduling?
Before scheduling, it helps to have the following ready: your name and company name, a contact phone number and email, the number of trucks requiring testing, the vehicle types and model years (if known), your preferred testing location or ZIP code, and a preferred testing date. ACT will work with you to confirm details and finalize scheduling. Visit /schedule-testing to get started.

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California Clean Truck Check Testing — Frequently Asked Questions

General Clean Truck Check Questions