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The Heavy-Duty Inspection and Maintenance program, also known as Clean Truck Check (CTC), requires all vehicle owners with heavy-duty trucks over 14,000 pounds gross vehicle weight rating (GVWR) that operate in California to ensure their emissions control systems remain well-maintained and function properly, throughout a vehicle’s useful life to reduce harmful emissions. The program requires fleets to report operation in California and conduct regular testing, similar to the light duty vehicle smog program. Vehicles are also subject to roadside inspections and emissions screening throughout California to ensure the requirements are being met. Clean Truck Check applies to in-state, out-of-state, and out-of-country heavy-duty vehicles operating in California. Beginning in 2024, all vehicles subject to CTC were required to register in the CTC reporting system (CTC-VIS) and pay their compliance fee. The table below reports the number of vehicles screened by CARBs emissions screening system in 2024 and the number of vehicles that registered and paid their fees in 2024. In subsequent years, we will report on vehicles that completed their periodic testing in addition those that registered and paid fees as the periodic testing requirements of CTC did not begin until January 1st, 2025.
| Clean Truck Check Statistics | |
|---|---|
| Number of vehicles screened in 2025 | 277,871 |
| Number of vehicles screened that are registered in CTC-VIS | 244,150 |
| Number of vehicles registered in CTC-VIS | 750,184 |
| Number of vehicles registered in CTC-VIS w/o fees paid | 20,777 |
| Unregistered in CTC-VIS | |
| Number of Notice of Non-Compliance letters sent1 | 7,183 |
| Number of Notice of Violations sent2 | 3,410 |
| Number of compliance certificates denied3 | 1,681 |
| Number of vehicles registered after notice sent | 1,240 |
- 1Non-Compliance letter is the initial contact letter sent to fleets to inform them of their suspected non-compliance.
- 2Notice of Violation (NOV) is the formal notice of violation and includes penalties.
- 3Total vehicles issued a denial of a CTC-VIS Certificate of Compliance after failing to come into compliance. This includes DMV registration holds for California registered vehicles.