ABOUTClean Truck Check - Heavy-Duty Inspection and Maintenance (HD I/M) Program
Under the Clean Air Act, CARB is responsible for developing statewide programs and strategies to reduce smog-forming and toxic pollutants emitted from mobile sources. Heavy-duty diesel vehicles greater than 14,000 pounds are major contributors to California’s air quality challenges. These vehicles still contribute the majority of on-road NOx and PM 2.5 emissions, despite significant efforts by CARB over the last 40 years to reduce NOx and PM emissions from this sector. Previous efforts include regulations and programs for new engine standards, manufacturer warranties, and durability requirements for emission control components; in-use truck rules to accelerate fleet turnover; and incentive programs to promote innovative low- and zero-emitting technologies.
Modern heavy-duty diesel vehicles are equipped with after-treatment systems like diesel particulate filters for controlling PM and selective catalytic reduction for cutting NOx emissions. However, when emissions control components malfunction, this may result in emissions increases that can stall efforts to achieve clean, healthy air in California’s communities. The Clean Truck Check will ensure heavy-duty vehicles operating in California are well-maintained and repaired rapidly when needed, and promote a level playing field for the businesses that operate them. Through an integrated strategy combining roadside emissions monitoring to screen for potential high-emitting vehicles, improved emissions testing procedures using on-board diagnostics data, emissions checks and data reporting at required intervals, and compliance verification requirements for freight contractors, seaports, and railyards, the regulation is one of the most impactful regulations approved in recent CARB history. When fully implemented, the regulation is 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. Clean Truck Check reporting deadline extended to January 31, 2024Deadline Update for Clean Truck Check Reporting: The California Air Resources Board (CARB) is extending the Clean Truck Check reporting deadline to January 31, 2024, to allow vehicle owners additional time to complete their initial fleet reporting and meet the compliance fee requirement for 2023.
Clean Truck Check Applicability and Exemptions
Clean Truck Check requires non-gasoline (diesel, alternative fuel, and hybrid) trucks, buses, and other heavy-duty vehicles, such as California-registered motorhomes, with a gross vehicle weight rating (GVWR) over 14,000 pounds that operate in California to undergo emissions testing. Clean Truck Check applies to most vehicles that operate in California, regardless of where they are registered. The purpose of the program is to ensure all emissions related equipment is functioning properly for the life of the vehicle.
The Clean Truck Check Program does not apply to:
Compliance Demonstration Requirements
Vehicle owners must demonstrate that affected vehicles comply with Clean Truck Check requirements to legally operate in California. DMV may block registration on California-based vehicles that have not demonstrated compliance.
At full implementation, an affected vehicle will be deemed compliant when:
Reporting Requirements
Periodic Testing Requirements
2013+ Model Year (MY) engines: On-Board Diagnostics (OBD) equipped vehicles
Pre-2013 MY engines: Non-OBD equipped vehicles
Submit passing test within 90 days before compliance test deadlines
**Example of periodic testing compliance dates for an out-of-state registered vehicle, California exempt-plated vehicle, or a federal government vehicle: VIN ending in “5” has compliance deadline of March 31 and a second compliance deadline on September 30 (6 months later). Compliance deadlines are based on the following chart: Emissions Testing Methods
The testing method is dependent on whether the vehicle has standardized OBD or not.
OBD-equipped vehicles include the following vehicles: Vehicles equipped with a 2013 MY and newer diesel or diesel hybrid engine. Vehicles equipped with a 2018 MY or newer alternative fuel or alternative fuel hybrid engine. Non-OBD vehicles are equipped with 2012 or older engines Below are the methods for OBD and non-OBD vehicles: OBD vehicles must have an OBD test performed and submitted by either of the following methods:
Non-OBD
Credentialed Clean Truck Check Tester
To ensure consistency, the Clean Truck Check program requires that all non-telematics emissions testing and reporting is performed by credentialed testers. Any individual from any state, Canada, or Mexico is eligible to complete CARB training to become a credentialed tester. Credentialed testers will need to renew their credentials every two years. The free, online credentialed tester training course is available now.
The online training includes the following training modules and an exam:
Freight Contractor, Broker, and Applicable Freight Facility Requirements
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January 31
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Clean Truck Check reporting deadline extended to January 31, 2024
Don't wait, submit your information for registration and be compliant!