California Air Resources Board

Tester Training and Examination Factsheet 

Where do I find my Clean Truck Check Tester Identification Number and what does it look like? 

It is in the bottom left corner of your Certificate of Completion issued after taking the Clean Truck Check Tester Training and passing the exam. Your Clean Truck Check Tester Identification Number will have eight characters and start with two capital letters followed by six numerals. The Clean Truck Check Tester Training system will provide you with an electronic version of your Certificate of Completion for downloading and printing immediately after you pass the exam. Retain this for your records. 

Does my Clean Truck Check Tester Identification Number ever expire? How do I renew it? 

Your unique Clean Truck Check Tester Identification Number is valid for two years from the date you passed the exam. Your Certificate of Completion includes your Tester ID expiration date. To renew your Clean Truck Check Tester Identification Number, you must retake the Clean Truck Check Tester Training Course and pass the exam again. 

Can I share my Clean Truck Check Tester Identification Number with co-workers who also want to perform Clean Truck Check compliance testing? 

No. Your Identification Number is unique to you and every tester must take the training and pass the exam to obtain their own Identification Number. 

What testing equipment do I need to perform Clean Truck Check compliance tests? 

To perform smoke opacity testing, you will need a SAE J1667-compatible smoke meter. A list of manufacturers and their contact information that sell SAE J1667-compatible smoke meters is available on CARB's website. 

To perform the Vehicle Emissions Control Equipment Inspection, you will need access to reliable sources of engine and vehicle technical specifications, such as service and repair manuals. You can refer to the Clean Truck Check Emissions Control Equipment Inspection Worksheet to help you perform the Non-OBD test. 

To perform OBD compliance tests, a Clean Truck Check tester must use a CARB-validated OBD test device. A list of manufacturers with CARB-validated OBD test devices is available on CARB’s website at: OBD Test Devices. Please ensure you have read and understand the OBD Readiness Criteria and Test Results FAQ. 

CARB’s webpage will continually be updated as devices become approved for use in the program. 

What if I already have a smoke meter or an OBD scan tool – can I use those? 

If you already have a SAE J1667-compatible smoke meter, you may continue to use that for Clean Truck Check compliance testing on vehicles without OBD systems. While there are existing OBD scan tools already on the market, you can only use one that has been validated by CARB for use in the Clean Truck Check program and is on CARB’s list of OBD Test Devices: SAE J1667-Compatible Smoke Meters. 

Attempting to use an OBD test device that is not validated by CARB will result in an unsuccessful test on the vehicle on which it is used. I have a valid smoke tester certification from the California Council on Diesel Education and Technology (CCDET). 

Do I still have to take CARB’s Clean Truck Check Tester Training Course? 

Yes. To perform Clean Truck Check compliance testing starting in January 2023, you must take the Clean Truck Check Tester Training and pass the exam. Smoke tester identification numbers obtained through CCDET for the Periodic Smoke Inspection Program (PSIP) are not valid for performing vehicle compliance tests within the Clean Truck Check program. 

How can I find Clean Truck Check testers in my area to hire for emissions compliance testing for my vehicles? 

You may find available for hire testers at CTC-VIS and the Credentialed Testers List. 

Inclusion on this list is not an endorsement by CARB but merely a courtesy for Clean Truck Check testers and vehicle owners that may need their services. 

Why am I not on the For-Hire Tester list? 

To be listed on the For-Hire Tester list in CTC-VIS, please ensure you have an active CTC-VIS Tester account. If you already have a CTC-VIS tester account and wish to be listed as For-Hire, please update your tester account by checking the For Hire box. See here for video instructions. Managing Your Tester Account  

How do I update my information on the For-Hire Tester list? 

If you need to change the email address associated with your account, please send hdim@arb.ca.gov with the contact information as it currently appears on the list, your Clean Truck Check Tester Identification Number, and the new email address that you are requesting to be changed to. Please update your tester account if you need to change other information on the For-Hire Tester list. See here for video instructions. Managing Your Tester Account . 

I am on the For-Hire Tester list but want to be removed. What do I do? 

Please update your tester account by unchecking the For Hire box. See here for video instructions. Managing Your Tester Account 

Where do I get additional information on the Clean Truck Check program? 

For more information, visit  Clean Truck Check. 

You may also view CARB’s training modules developed for the Clean Truck Check Tester Training Course at Clean Truck Check Tester Training Course. Scroll to the Tester training Course Videos section to view them. These modules provide more in-depth information on the requirements of the Clean Truck Check regulation and testing procedures. 

How can I receive updates on Clean Truck Check program activities? 

To receive automatic email updates on Clean Truck Check program activities, such as when additional CARB-validated OBD test devices are available for use in the Clean Truck Check program, sign up on the GovDelivery list at California Air Resources Board (govdelivery.com). 

Where can I find the text of the final HD I/M regulation? 

The HD I/M regulation, referred to as the final regulation order, is in title 13, California Code of Regulations, sections 2195 - 2199.1 and is available at Final Regulation Order - Attachment A-1 Heavy-Duty Inspection and Maintenance Program. 

If I have additional questions, how do I contact CARB? 

Please email staff at hdim@arb.ca.gov. We generally respond within one to three business days.