--- title: "Beat the Deadline: Your Guide to the CARB Clean Truck Check" description: "CARB Clean Truck Check: Your guide to CA diesel truck emissions testing. Learn about deadlines, early testing, and staying compliant. OVI Testing and OBD" image: https://sacvalleydieseltesting.com/hubfs/Screenshot%202025-01-31%20at%208.18.59%20PM.png --- [Skip to content](https://sacvalleydieseltesting.com/blog/beat-the-deadline-your-guide-to-the-carb-clean-truck-check#main-content) [![Screenshot 2025-02-18 at 10.34.07 PM](https://sacvalleydieseltesting.com/hs-fs/hubfs/Screenshot%202025-02-18%20at%2010.34.07%20PM.png?width=244&height=121&name=Screenshot%202025-02-18%20at%2010.34.07%20PM.png)](https://sacvalleydieseltesting.com) - [Home](https://sacvalleydieseltesting.com) - [About](https://sacvalleydieseltesting.com/carb-info) - [Blog](https://sacvalleydieseltesting.com/blog) - [FAQ](https://ww2.arb.ca.gov/our-work/programs/inspection-and-maintenance-program/hd-im-fact-sheets) - [Diesel Motorhomes](https://sacvalleydieseltesting.com/motorhome-carb-testing) Open main navigation Close main navigation - [Home](https://sacvalleydieseltesting.com) - [About](https://sacvalleydieseltesting.com/carb-info) - [Blog](https://sacvalleydieseltesting.com/blog) - [FAQ](https://ww2.arb.ca.gov/our-work/programs/inspection-and-maintenance-program/hd-im-fact-sheets) - [Diesel Motorhomes](https://sacvalleydieseltesting.com/motorhome-carb-testing) - [530-650-6646](tel:5306506646) [530-650-6646](tel:5306506646) [All posts](https://sacvalleydieseltesting.com/blog/all) February 1, 2025 # Beat the Deadline: Your Guide to the CARB Clean Truck Check By  Nathan Ament  ·  1 minute read ## ![Screenshot 2025-01-31 at 8.18.59 PM](https://sacvalleydieseltesting.com/hs-fs/hubfs/Screenshot%202025-01-31%20at%208.18.59%20PM.png?width=1676&height=1108&name=Screenshot%202025-01-31%20at%208.18.59%20PM.png) January's end means the CARB Clean Truck Check's mandatory emissions testing is in full swing. Don't get caught off guard! If your RV or medium- or heavy-duty diesel truck operates in California, understanding and complying with this program is crucial. This guide breaks down what you need to know to stay ahead of the curve. **What is the CARB Clean Truck Check?** The CARB Clean Truck Check (formerly the Heavy-Duty Inspection and Maintenance Program) mandates periodic emissions testing for medium- and heavy-duty diesel trucks in California. This involves an On-Board Diagnostics (OBD) test for most vehicles, and smoke opacity testing for some older models. **Test Early, Breathe Easy: The 90-Day Window** A common pitfall is waiting until the last minute. Did you know you can get your truck tested up to 90 days *before* your deadline? This buffer is invaluable for several reasons: - **Time to Fix Issues:** If your truck fails the test, you'll have time to make necessary repairs without facing penalties or downtime. - **Avoid Delays:** Unexpected issues like weather, shop availability, or scheduling conflicts can arise. Testing early provides a cushion. - **Weather Woes:** Smoke opacity testing can't be performed in the rain. Don't let a sudden downpour derail your compliance. **Don't Delay, Schedule Today!** Is your truck's compliance date approaching? Proactive testing is the key to staying on the road. Scheduling your test in advance minimizes disruptions and ensures you meet the deadline. As a CARB-certified mobile tester, I bring the testing to you, making the process convenient and efficient. **Ready to schedule your early compliance check? Contact me today!**   [**WWW.SACVALLEYDIESELTESTING.COM**](https://sacvalleydieseltesting.com/)   **![Screenshot 2024-09-02 at 9.04.58 AM-1](https://sacvalleydieseltesting.com/hs-fs/hubfs/Screenshot%202024-09-02%20at%209.04.58%20AM-1.png?width=569&height=292&name=Screenshot%202024-09-02%20at%209.04.58%20AM-1.png)**     Share [facebook-f icon](http://www.facebook.com/share.php?u=https://sacvalleydieseltesting.com/blog/beat-the-deadline-your-guide-to-the-carb-clean-truck-check) [linkedin-in icon](http://www.linkedin.com/shareArticle?mini=true&url=https://sacvalleydieseltesting.com/blog/beat-the-deadline-your-guide-to-the-carb-clean-truck-check) [twitter icon](https://twitter.com/intent/tweet?url=https://sacvalleydieseltesting.com/blog/beat-the-deadline-your-guide-to-the-carb-clean-truck-check) [pinterest-p icon](http://pinterest.com/pin/create/link/?url=https://sacvalleydieseltesting.com/blog/beat-the-deadline-your-guide-to-the-carb-clean-truck-check) [envelope icon](mailto:?body=https://sacvalleydieseltesting.com/blog/beat-the-deadline-your-guide-to-the-carb-clean-truck-check) [![](https://sacvalleydieseltesting.com/hs-fs/hubfs/Screenshot%202024-09-02%20at%209.04.58%20AM-1.png?width=444&height=228&name=Screenshot%202024-09-02%20at%209.04.58%20AM-1.png)](https://sacvalleydieseltesting.com/)   Learn more about the California Air Resources Board HD/IM Diesel Emissions Program that goes into effect this year by clicking on the links under Resources.       [facebook-f icon](https://www.facebook.com/profile.php?id=61570893532975) [linkedin-in icon](https://www.linkedin.com/company/106506390/admin/dashboard/) [youtube icon](https://youtu.be/mwR0TwFdHPU?si=uVxVAgoWq2lVix7B) instagram icon ## **Resources** [Clean Truck Check Website](https://ww2.arb.ca.gov/our-work/programs/CTC) [Truck Stop Videos - Including Spanish Versions](https://www.youtube.com/@carbtruckstop5804/videos) [CARB Motorhome FACT SHEET](https://ww2.arb.ca.gov/resources/fact-sheets/clean-truck-check-motorhome-fact-sheet) [The NEW Semi-Annual Testing Requirements](https://ww2.arb.ca.gov/clean-truck-check-requirements-vehicles-subject-semi-annual-compliance) [CARB info VIDEO](https://ww2.arb.ca.gov/our-work/programs/truckstop-resources/truckstop/training-course-clean-truck-check-hd-im-program) [Testing Twice A Year - Calendar](https://ww2.arb.ca.gov/clean-truck-check-requirements-vehicles-subject-semi-annual-compliance) [Vehicle Inspection System (CTC-VIS) Portal](https://cleantruckcheck.arb.ca.gov) [Database Reporting Instructions CTC-VIS](https://youtu.be/Zd1YaEBM-hE?si=KXFPV6TxuKQ6yM21) [DPF Maintenance](https://youtu.be/NB_dZTnhYTs?si=gC8S-TU8bzEdbekw) [Information About Selling a Vehicle](https://ww2.arb.ca.gov/resources/fact-sheets/dealer-fact-sheet-clean-truck-check) [Information About Clearning Codes](https://ww2.arb.ca.gov/board-diagnostic-obd-readiness-criteria) [Acceptable Smoke Levels For Smoke Tests](https://ww2.arb.ca.gov/sites/default/files/inline-images/Opacity%20%25s.png) [Missing Engine Label Information](https://ww2.arb.ca.gov/resources/fact-sheets/clean-truck-check-what-do-when-ecl-missingillegible) [Our Site Data Privacy Policy\*](https://www.freeprivacypolicy.com/live/4839b8f5-5648-436e-9a7c-d6f08e41b09e)   ![CTC_Testers_hrz-white](https://sacvalleydieseltesting.com/hubfs/CTC_Testers_hrz-white.svg "CTC_Testers_hrz-white") Information about CARB and HD/IM Program is subject to change, for the most accurate and up-to-date information go to the California Air Resouces Board Website                                                                                                                                                                                                                    Copyright © 2026, Sac Valley Mobile Diesel Testing ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Nathan Ament", "url" : "https://sacvalleydieseltesting.com/blog/author/nathan-ament" }, "dateModified" : "2025-02-01T04:24:26.702Z", "datePublished" : "2025-02-01T04:24:26.000Z", "headline" : "Beat the Deadline: Your Guide to the CARB Clean Truck Check", "image" : [ "https://sacvalleydieseltesting.com/hubfs/Screenshot%202025-01-31%20at%208.18.59%20PM.png" ], "mainEntityOfPage" : { "@id" : "https://sacvalleydieseltesting.com/blog/beat-the-deadline-your-guide-to-the-carb-clean-truck-check", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://sacvalleydieseltesting.com/hubfs/Screenshot%202024-09-02%20at%209.04.58%20AM-1.png" } } } ``` ```json { "@context" : "http://schema.org", "@type" : "Article", "author" : { "@type" : "Person", "name" : [ "Nathan Ament" ] }, "datePublished" : "2025-02-01T04:24:26+0000", "description" : "CARB Clean Truck Check: Your guide to CA diesel truck emissions testing. 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