Who Must Comply?
- Knowledge ID
- KO-CTC-0002
- Program Area
- Clean Truck Check
- Topic Type
- Overview
- Reading Time
- 1 min read
- Last Reviewed
- Jul 17, 2026
- Applies To
- Owner Operator, Fleet Manager, Service Provider — On Road Heavy Duty Diesel, Motorhome Rv, Agricultural, Specialty On Road — Both registration
Quick Answer
Most diesel-powered vehicles with a manufacturer's Gross Vehicle Weight Rating (GVWR) greater than 14,000 pounds that operate on California public roads are generally subject to Clean Truck Check. Vehicle type, engine type, registration status, and specific CARB exemptions determine whether a vehicle must comply.
California Clean Truck Check generally applies to diesel-powered heavy-duty vehicles operating on California public roads.
Whether a vehicle must comply depends on several factors, including vehicle weight, engine type, registration status, and applicable exemptions established by CARB.
Vehicle Weight
Section titled “Vehicle Weight”One of the primary factors used to determine program applicability is the vehicle’s Gross Vehicle Weight Rating (GVWR).
California and Out-of-State Vehicles
Section titled “California and Out-of-State Vehicles”Clean Truck Check is not limited to California-registered vehicles.
Motorhomes (RVs)
Section titled “Motorhomes (RVs)”Diesel-powered motorhomes may also be subject to Clean Truck Check requirements.
Agricultural Vehicles
Section titled “Agricultural Vehicles”Certain agricultural vehicles may qualify for different testing schedules or exemptions depending on their primary use and CARB regulations.
Specialty Vehicles
Section titled “Specialty Vehicles”Certain specialized vehicles may also fall under Clean Truck Check when operated on California public roads.
Vehicle configuration alone does not necessarily determine compliance; operational use and applicable CARB requirements should also be considered.
Common Misunderstandings
Section titled “Common Misunderstandings”Many people assume that:
- Only California-registered vehicles must comply.
- Only commercial trucks are affected.
- Vehicle weight alone determines compliance.
In reality, multiple factors determine whether a vehicle falls under Clean Truck Check requirements.
Bottom Line
Section titled “Bottom Line”The best way to determine whether a vehicle must comply is to evaluate the vehicle against CARB’s current eligibility requirements.