California Air Resources Board

The following information is for On-Board Diagnostic (OBD) device vendors pursuing the California Air Resources Board (CARB) certification to participate in the Clean Truck Check.

The OBD testing device certification establishes the process that OBD device vendors must go through to demonstrate that their devices meet the requirements of the Regulation. Upon successful demonstration, CARB will issue the vendor an Executive Order (EO) allowing for sale and use of the device within the program.

Regulatory Documents

• California Standards for Heavy-Duty On-Board Diagnostic Devices contains vendor device certification requirements.
• Final Regulation Order contains the full regulation requiring periodic vehicle emissions testing and reporting on nearly all heavy-duty vehicles operating in California.

Application Process

• Submit a vendor test plan and perform vendor initial validation device testing based on CARB's approved test plan
• Submit certification application package during the next open application period planned for: June 1 to 30, 2024
• Perform required vendor field testing following CARB approval
• Work directly with CARB staff to complete the certification process

CARB-certified OBD Test Devices

• EO Listing by Vendor

The 2024 OBD Device Vendor Guidance Package is now available to assist vendors who are interested in certifying OBD testing devices for Clean Truck Check. To inquire about device certification process and details, contact hdim@arb.ca.gov with subject: “Interested Vendor, Device Certification Inquiry.”