California’s New Heavy-Duty Vehicle Inspection Program: What Fleet Owners Need to Know About Clean Truck Check

California’s ambitious Clean Truck Check program represents a significant shift in how heavy-duty vehicles are monitored for emissions compliance across the state. Senate Bill 210 (Leyva; Chapter 298, Statutes of 2019) directed CARB to develop and implement a comprehensive heavy-duty vehicle inspection and maintenance (HD I/M) regulation to ensure that vehicles’ emissions control systems are properly functioning when traveling on California’s roadways. The Board approved the regulation on December 9, 2021, with implementation to be phased in starting January 2023.

Understanding the Clean Truck Check Program

Dubbed the Clean Truck Check, the program combines periodic vehicle testing requirements with other emissions monitoring techniques and expanded enforcement strategies to identify vehicles in need of emissions related repairs and ensure any needed repairs are performed. This comprehensive program affects virtually all heavy-duty commercial vehicles operating in California, regardless of where they’re registered.

Mandates that in order to operate in California, all heavy-duty non-gasoline vehicles with a GVWR of more than 14,000 pounds must pass emissions checks. Comparable to a Smog Check program for large trucks. The program extends beyond California-registered vehicles to include any heavy-duty vehicle operating on state roads and highways.

Which Vehicles Are Affected?

Clean Truck Check applies to nearly all diesel and alternative fuel heavy-duty vehicles with a gross vehicle weight rating (GVWR) over 14,000 pounds that operate on California public roads and highways even if they are not registered in California. This includes public vehicles (federal, state, and local government); motorcoaches; transit, shuttle and school buses; hybrid vehicles; commercial vehicles; personal vehicles; California registered motorhomes; single vehicle fleets; and vehicles registered outside of California (not including motorhomes).

The scope is extensive, covering everything from delivery trucks and construction equipment to buses and recreational vehicles. A vehicle that operates in California is subject to the Clean Truck Check requirements regardless of where they are registered.

Implementation Timeline and Key Deadlines

The Clean Truck Check program has been implemented in phases to allow vehicle owners time to adapt. Clean Truck Check is being implemented in three phases. Phase 2, which started October 1st, 2023, requires vehicle owners who are subject to the program to enter their vehicles in CARB’s Clean Truck Check database and pay an initial annual compliance fee of $30 per vehicle by December 31st, 2023. Phase 3, which starts January 1, 2024, and applies to all compliance deadlines after July 1, 2024, requires heavy-duty vehicle owners to conduct periodic emissions testing on their vehicles, similar to California’s Smog Check program for cars.

Emissions compliance testing requirements are effective October 1, 2024. All compliance deadlines on or after January 1, 2025 will require the submission of a passing emissions compliance test as part of the vehicle’s compliance demonstration.

Testing Requirements and Procedures

The testing process varies depending on the vehicle’s age and equipment. Testing requirements vary based on whether the vehicle is equipped with onboard diagnostics (OBD). OBD-equipped vehicles are required to undergo a scan of the engines’ OBD data using a CARB-validated OBD test device. Non-OBD vehicles are required to undergo a smoke opacity test and a visual inspection of the vehicle’s emissions control equipment, referred to in this program as the Vehicle Emissions Control Equipment Inspection.

For vehicle owners in the Los Angeles area seeking reliable testing services, Clean Truck Check Los Angeles, CA providers can help ensure compliance with these new requirements. Emissions compliance testing must be performed by a CARB credentialed tester and passing tests may be submitted by the tester up to 90 days prior to the vehicle’s compliance deadline to allow time for any necessary repairs.

Compliance Costs and Fee Structure

For vehicles subject to Clean Truck Check, you must pay your annual compliance fee before the due date to remain compliant. The annual fee increases in accordance with California’s Consumer Price Index. For example, the compliance fee for 2025 will be $31.18. While the annual fee may seem modest, the broader program costs are substantial. According to a CARB’s Staff Report, the HD I/M Regulation will cost $4.12 billion between 2023-2050, with a maximum annual cost of $350 million in 2024.

Testing Frequency Requirements

The frequency of required testing depends on the vehicle type and year. For 2024 only, all vehicles subject to semiannual compliance testing will be required to test and submit results to CARB one time. Starting in 2025, these vehicles will have semiannual compliance deadlines (two each year, one every six months).

Starting in 2027, vehicles equipped with OBD equipment will begin reporting quarterly. This represents a significant increase in testing frequency that fleet operators must plan for in their operational budgets.

Enforcement and Penalties

California takes compliance seriously, with multiple enforcement mechanisms in place. Starting January 1, 2024, all trucks driving in California will need proof of compliance with these requirements to continue operating in the state. Operating in California without registration in the compliance database could result in violations from CARB and/or the CHP.

CARB Enforcement and California Highway Patrol have the authority to conduct field inspections at weigh stations and roadside locations. In addition, non-compliant vehicles may be denied entry into ports and railyards. Registration holds are being placed by the California Department of Motor Vehicles (DMV) on vehicles that do not comply with Clean Truck Check requirements, including those with CA DMV-exempt license plates.

Environmental Impact and Benefits

When fully implemented, the program will provide significant reductions in smog-forming and carcinogenic toxic air pollution necessary to achieve federal air quality mandates and healthy air in California’s communities. The program’s environmental benefits are substantial, with the regulation projected to cut statewide NOx emissions by over 81 tons per day and PM emissions by 0.7 tons per day in 2037. Together, these emissions reductions will result in over 7,500 avoided premature deaths.

Preparing for Compliance

Vehicle owners should take proactive steps to ensure compliance. To be considered compliant vehicle owners must meet all compliance deadlines and: Report the vehicle to Clean Truck Check, Vehicle Inspection System (CTC-VIS). Pay the vehicle’s annual compliance fee. Submit passing Clean Truck Check emissions.

Fleet operators should also consider the logistics of testing multiple vehicles. Be sure to follow the instructions in the letter you receive from CARB and don’t wait until the last day to get your vehicle tested and submit test results to CARB. Early planning and establishing relationships with certified testing providers will be crucial for maintaining operational continuity.

The Clean Truck Check program represents California’s most comprehensive effort to ensure heavy-duty vehicles maintain proper emissions controls throughout their operational life. While the requirements may seem daunting, understanding the program’s structure and planning ahead will help fleet operators navigate these new regulations successfully while contributing to cleaner air for all Californians.