Clean Truck Check - Heavy-Duty Inspection and Maintenance (HD I/M) Program
This program, formerly known as the Heavy-Duty Inspection and Maintenance Program, targets heavy-duty vehicles like trucks buses, and motorhomes, ensuring they’re running clean and efficiently. One key difference is that the Clean Truck Check regulations apply to all trucks operating in the state, not just trucks based in California.
Clean Truck Check Reporting: The California Air Resources Board (CARB) requires all vehicles to report to complete their initial fleet reporting and meet the compliance fee requirement. To access the reporting database to complete your reporting requirements and for more details about California requirements, visit Clean Truck Check (HD I/M)
The Clean Truck Check regulation – also known as the Heavy Duty Inspection and Maintenance Program – applies to nearly all non-gasoline vehicles (including diesel vehicles) with a gross vehicle weight rating of 14,000 pounds or more which operate within California. Along with the reporting requirement, the regulation requires vehicle owners to pay a fee of $30 per reported vehicle.
After the reporting period closes, all vehicles covered by the regulation will require proof of compliance to continue legally operating within the state. Failure to comply could result in CARB placing a DMV registration hold on non-compliant vehicles.
The Clean Truck Check regulation was approved by CARB in 2021. Phase 1 of implementation began January 1, 2023, with CARB deploying Remote Emissions Monitoring Devices and roadside monitors that examine the emissions of passing heavy-duty vehicles and flag potential high emitters, which are then targeted for Notices to Submit to Testing. Phase 2 of the program—the current database-reporting requirement—was initiated on October 1, 2023.
Phase 3, which will begin on January 1, 2025, requires owners of heavy-duty vehicles to submit to emissions testing twice a year. For California-registered vehicles, emissions testing compliance deadlines are tied to the vehicle’s DMV registration date, and passing test results must be submitted within 90 days of the compliance deadline, which means testing can begin in October 2024 for certain vehicles.
CARB Upcoming Requirements
Periodic Testing.
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A passing compliance test must be submitted to CARB within 90 days before a vehicle’s compliance deadline.
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Starting in 2025, these vehicles will have semiannual compliance deadlines (two each year, one every six months), with a 90-day submission date before registration expiration. Below is a chart that details how your vehicle's DMV registration date aligns with compliance and testing due dates for vehicles registered in California.
Compliance tests are only required once annually for on-road agricultural vehicles and motorhomes, and passing test results must be submitted within 90 days of the compliance deadline.
Database Reporting
Vehicle owners (or designees) will be required to report in 2024 to the Clean Truck Check database when creating their accounts to comply with the Heavy-Duty Vehicle Inspection and Maintenance regulation. Required information must be entered for vehicles in your fleet that are subject to Clean Truck Check with a $30 per vehicle compliance fee(s) paid for all vehicles per year. This may include paying a fee for 2023 as well.Notice to Submit TestCARB has implemented Roadside Emissions Monitoring Devices (REMD). This could result in you receiving a Notice to Submit to Testing (NST) letter leading to enforcement violations, citations and fines. To become and remain CARB compliant, take the first step and order your Clean Truck Check (HD I/M) emissions compliance test.
DMV Registration
Beginning in 2025, the registration hold may also be due to not meeting the compliance requirements for the Clean Truck Check program. For information on that program, click on the Clean Truck Check (HD I/M)