Launch service
Department website
Contact
Description
The California Clean Truck Check uses the Heavy-Duty Inspection and Maintenance (HD I/M) program to regularly ensure vehicles have proper functioning emission control systems.
Phone: 800-242-4450
Frequently Asked Questions
Who can I email about the Clean Truck Check program?
You can send an email to the program's primary contact email: hdim@arb.ca.gov
How can I learn more about the Clean Truck Check program?
Visit the full FAQs
What vehicles are not subject to the Clean Truck Check?
The program does not apply to:
- Zero-emission vehicles
- Military tactical vehicles
- Emergency vehicles
- New vehicles with engines certified to the most stringent NOx standard
- Motorhomes registered outside of CA
- Vehicles operating under an experimental permit
Do I still need to report if my vehicle isn't registered in CA?
Yes, all non-gasoline heavy-duty vehicles with a GVWR over 14,000 lbs. that operate in CA must be compliant with Clean Truck Check. Out of state vehicles have the same compliance requirements as California registered vehicles.