Clean Truck
California Air Resources Board will require a ‘smog check’ for diesel powered heavy-duty trucks and buses. Included are heavy-duty vehicles with a gross vehicle weight rating (GVWR) greater than 14,000 pounds. CARB states these vehicles are responsible for more than 50 percent of nitrogen oxides and fine particle diesel pollution from all mobile sources in the state. This new “smog check” requirement is a significant step in California clean air plan.
1 million heavy-duty trucks and buses operating in California are affected. The twice-a-year inspections will ensure that the emissions control systems maintain the same efficiency as the vehicle ages.
OBD systems have been required by CARB on heavy-duty vehicles since 2013. Older heavy-duty vehicles without on-board diagnostic systems would continue the current opacity testing requirements with an added visual testing component, twice each year.
Deadline 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. To access the reporting database to complete your reporting
2013+ Model Year (MY) engines: On-Board Diagnostics (OBD) equipped vehicles.
- OBD test submission: twice per year
- OBD test submission increases to four times per year after 3 years of two times per year testing
- CA Motorhomes: once per year
- On-Road Agricultural (AG) Vehicles: once per year
The Clean Truck Check Program does not apply to:
- Zero-emission trucks
- Military tactical vehicles
- Authorized emergency vehicles
- Motorhomes registered outside of California
- Vehicles operating under an experimental permit
- Historical vehicles
- Gasoline vehicles
Submit passing test within 90 days before compliance test deadlines
- CA registered vehicles: based on DMV registration date*
- Out-of-state registered vehicles, California exempt-plated vehicles (state and local public agency vehicles), and federal government vehicles: based on last number of VIN**
* Example of periodic compliance dates for a CA registered vehicle: If the vehicle's DMV registration date is March 31, then the vehicle’s periodic submission deadlines would be March 31 and September 30 (6 months later) for a given year.
**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:
| Month | Last Number of VIN |
|---|---|
| Oct | 0 |
| Nov | 1 |
| Dec | 2 |
| Jan | 3 |
| Feb | 4 |
| March | 5 |
| April | 6 |
| May | 7 |
| June | 8 |
| July | 9 |
| Last Number of VIN | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|
| Month | Oct | Nov | Dec | Jan | Feb | March | April | May | June | July |
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CA Clean Truck Check
CA Clean Truck Check