Learn about Noregon's 30-year history helping the industry maximize uptime and advance technician skillsets. OTHER Learn about Noregon's 30-year history helping the industry maximize uptime and advance technician skillsets. OTHER Read time: 5 minutes CARB has enacted the Clean Truck Check Act , also known as the Heavy-Duty Inspection and Maintenance (HD I/M) regulation, requiring heavy-duty vehicles that travel within the state of California to submit and pass emissions inspections on a scheduled basis. What is a CARB Certified Tester? A CARB Clean Truck Check Certified tester, or a Heavy-Duty Inspection and Maintenance (HD I/M) tester , is “a person who is authorized to perform vehicle compliance testing and submit test results to California Air Resources Board (CARB) in accordance with the requirements of the HD I/M regulations” according to CARB . Take this information with you to save for later. How Do I Become a CARB Certified Tester? Technicians must pass the tester training course to become a CARB certified tester. The course is designed to educate on each heavy-duty compliance test’s regulatory requirements and testing process. In addition to being a Clean Truck Check certified tester, those who pass will also meet the training requirements for the Periodic Smoke Inspection Program (PSIP) . Eligibility Requirements While there are no formal prerequisites for taking the training course, it is beneficial for testers to have a background and general understanding of the diesel industry and the Clean Truck Check program requirements. Cost of Training There is no fee associated with taking the CARB Certified tester training course. How to Access the Tester Training Course To access the tester training course, visit CARB’s website and apply through their registration form. When registering, it’s important to double-check that the information being entered is accurate. The email address included should only belong to the intended tester, especially since that email will be part of their login. It is recommended that the email address used is an employee email for those working in a shop, and not one that is for personal use. In addition to the email address, testers should ensure that they are consistent in plugging in both the physical address and the mailing address. The address should be the location of their shop. When plugging this information in, CARB provides a checkbox option for contact information to appear on CARB’s website. While smaller shops may benefit from this, it is not suggested larger fleets do so, as anyone will be able to contact a local certified tester through CARB’s site. The Minimum Score Required to Pass To pass the tester training course, testers must score at least 80 percent or higher. How Long Does the Test Take? The test takes around 1 hour and 45 minutes. Throughout that time, testers will: View 6 training modules What Happens after I Complete Tester Training? Once a tester passes their training, they will be given a certificate of completion to download and print. Testers need to keep track of this certificate for recordkeeping. Tester ID Identification Number Once testers receive the certificate of completion, they can find their tester ID at the bottom of the document. This Tester ID Identification Number is only valid for two years from the date of passing the exam. After the ID expiration date, testers must retake the test to remain active. Where Can I Work? Because any vehicle that enters California’s borders must adhere to the Clean Truck Check requirements, testers can serve a variety of roles in the industry. Fleets employ testers to ensure all their vehicles remain compliant, while service centers need certified testers to inspect and service their customers’ vehicles. There are even opportunities to work for yourself by offering a mobile inspection service to local owner/operators. What Tools Can I Use? CARB requires that all certified testers only use CARB-approved inspection applications. One of the approved tools available is Noregon’s Truck Check Up . Truck Check Up allows testers to easily submit and view all results through an accessible portal where they can access current and past submissions. Tying It All Together Being a CARB Certified tester has many benefits, especially for fleets and businesses that rely on transportation to or through California state lines. A Modern Approach to CAN Bus Diagnostics Why traditional CAN bus diagnostics fail and how modern diagnostics identify faults faster. Guide to CARB’s Clean Truck Check Learn about California’s Clean Truck Check program and how to stay compliant with new requirements. A Technician’s Guide to DPF Regens Learn the importance of DPF regens and the costs and consequences of running them unnecessarily. Small Town Shop Offers Big-Time Services Learn how Van Cleef Auto Parts uses TaaS to provide leading service, versatility, and customer satisfaction. This whitepaper explores the 2026 economic outlook, industry trends, and customer research findings. 10 Steps Before Clearing Fault Codes Learn the 10 steps to take before clearing a fault code to avoid recurring issues. Streamline the Diagnostic Process As shops take inventory of their diagnostic tools, it's vital to consider the importance of tech-to-tool ratios. Differences Between OE and SAE Fault Codes Learn the differences between OE and SAE fault codes and how JPRO can simplify fault code analysis. Ways to Recruit & Retain Skilled Truck Drivers Explore the most effective ways to recruit and retain the backbone of the American economy: truck drivers. ©Noregon. JPRO, NextStep, and TripVision are registered trademarks of Noregon. All Rights Reserved.