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You’re running a 2013 or newer truck over 14,000 pounds GVWR in California. That means you’re dealing with CARB’s Clean Truck Check requirements whether you like it or not. Miss your compliance deadline and you’re looking at DMV registration blocks, potential fines up to $10,000 per vehicle per day, and the very real possibility of getting flagged by roadside monitoring devices.
The testing requirement went into effect October 1, 2024. If your compliance deadline is January 1, 2025 or later, you need a passing emissions test on file. Some trucks need testing every six months. Starting in 2027, OBD-equipped vehicles will require testing four times per year.
We’re CARB-credentialed testers in Cerritos who handle heavy-duty vehicle compliance testing daily. You schedule your test, we run the OBD scan using CARB-certified equipment, and if you pass, we submit your results directly to the state. You get documentation, your compliance deadline is satisfied, and your trucks stay on the road. That’s the outcome that matters.
All SMOG Motors serves the Cerritos trucking community with CARB diesel compliance testing. We’re located right in the heart of LA County’s commercial vehicle corridor, which means we understand the pressure you’re under to keep trucks moving and compliant.
We completed CARB’s Tester Training Course and maintain our credentials because this isn’t a side service for us. It’s what we do. Cerritos has a high concentration of owner-operators and small fleets, and we’ve built our testing process around minimizing your downtime while maximizing your compliance confidence.
You’re not getting a generic smog shop trying to figure out heavy-duty regulations on the fly. You’re getting testers who know the difference between semi-annual and quarterly requirements, who understand the 90-day testing window, and who can actually explain what your OBD scan results mean.
First, you schedule your Clean Truck Check appointment. We need to verify your truck qualifies—model year 2013 or newer with a GVWR over 14,000 pounds. Older trucks and lighter vehicles don’t fall under this program, so if you’re not sure, call us before you come in.
When you arrive, we connect CARB-certified OBD testing equipment to your truck’s diagnostic system. The scan pulls data directly from your engine’s emissions control systems to verify everything is functioning properly. This isn’t a tailpipe test—it’s a computer-based analysis of your truck’s onboard diagnostics.
If your truck passes, we submit the results electronically to CARB on your behalf. You can submit a passing test up to 90 days before your compliance deadline, which gives you a buffer if repairs are needed. You’ll receive documentation showing your test date, results, and next compliance deadline. If your truck doesn’t pass, we’ll explain what the diagnostic codes mean and what needs attention before you can retest. The whole process typically takes under an hour if your truck is ready and compliant.
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You’re getting a CARB-credentialed tester who’s trained specifically on Senate Bill 210’s Heavy-Duty Inspection and Maintenance requirements. That training matters because the regulations are complex and the penalties for non-compliance are severe.
We use CARB-certified OBD scanning equipment that meets California Air Resources Board specifications. Your test results get submitted directly through the state’s system, which means no paperwork delays or manual filing errors. You receive printed documentation immediately after testing that includes your vehicle information, test date, pass/fail status, and compliance deadline.
For Cerritos-based fleets and owner-operators, location matters. You’re not driving across LA County to find a credentialed tester. We’re local, we understand the commercial vehicle landscape here, and we know that every hour your truck sits is revenue you’re not making. The 2025 compliance fee is $31.18 per vehicle, and that’s set by CARB, not us. What we control is making your testing experience as efficient as possible while ensuring accuracy. You also get guidance on your specific compliance schedule—whether you’re on a semi-annual cycle or facing the upcoming quarterly requirements for OBD-equipped vehicles starting in 2027.
Your truck needs testing if it’s model year 2013 or newer and has a gross vehicle weight rating over 14,000 pounds. This includes diesel and alternative fuel heavy-duty trucks, buses, commercial vehicles, privately-owned vehicles, government vehicles, and out-of-state trucks operating in California.
The requirement covers hybrid trucks, semi-trucks, box trucks, and other heavy-duty vehicles that meet those two criteria. If your truck is older than 2013 or weighs less than 14,000 pounds GVWR, you’re not subject to Clean Truck Check requirements.
CARB started enforcing compliance deadlines on October 1, 2024. If your deadline falls on January 1, 2025 or later, you must have a passing emissions compliance test submitted to satisfy your requirement. Registration holds are already being placed by the California DMV on non-compliant vehicles, including those with CA DMV-exempt plates.
Testing frequency depends on your vehicle type and model year. Most trucks subject to Clean Truck Check start with semi-annual testing, meaning you need to demonstrate compliance every six months. Your specific compliance deadlines are assigned by CARB based on your vehicle registration and specifications.
Starting in October 2027, OBD-equipped vehicles will be required to undergo testing four times per year. That’s a significant increase from the current semi-annual requirement, and it applies to 2013 and newer diesel engines plus 2018 and newer alternative fuel engines.
You can submit a passing test up to 90 days before your compliance deadline. For example, if your deadline is February 1, 2025, you can test and submit results as early as November 3, 2024. This 90-day window exists specifically to give you time for repairs if your truck doesn’t pass on the first attempt. Don’t wait until the last minute—registration holds and enforcement actions happen when deadlines are missed.
If your truck fails, you’ll receive diagnostic information showing which emissions control systems aren’t functioning properly. The OBD scan identifies specific fault codes that indicate what needs repair. You’ll need to get those issues fixed before you can retest and achieve compliance.
Failed tests don’t get submitted to CARB, so you won’t face immediate penalties just for failing. However, you still need to meet your compliance deadline with a passing test. That’s why testing early in your 90-day window matters—it gives you time to make repairs and retest before your deadline hits.
Once repairs are complete, you come back for another test. If your truck passes, we submit those results to CARB and you’re compliant. The cost of repairs varies depending on what’s wrong, but addressing emissions system issues promptly prevents bigger problems down the road. CARB uses roadside emissions monitoring devices and automated license plate readers to flag potential high emitters, so a truck with failing emissions systems will likely get caught even between testing cycles.
Yes. Fleets that don’t comply with CARB requirements face fines up to $10,000 per vehicle per day. Out-of-state trucks can be restricted from operating in California entirely. The DMV places registration holds on non-compliant vehicles, which means you can’t renew your registration until you satisfy the testing requirement.
CARB enforcement is active and aggressive. Since January 2023, they’ve used roadside emissions monitoring devices and automated license plate readers to screen for high-emitting vehicles. If your truck gets flagged, you’ll receive a Notice to Submit to Testing from CARB Enforcement. Ignoring that notice escalates the situation.
Beyond fines, non-compliance means operational disruption. A truck that can’t be registered can’t legally operate. A truck that gets red-tagged at a roadside inspection is done until compliance is proven. For owner-operators and small fleets in Cerritos, that’s lost revenue every single day. The compliance fee for 2025 is $31.18 per vehicle—compare that to potential $10,000 daily fines and the choice is obvious.
You need a CARB-credentialed tester who’s completed the state’s Tester Training Course and scored at least 80 percent on the exam. Not every smog shop is credentialed for Clean Truck Check, and not every shop has the CARB-certified OBD testing equipment required for heavy-duty vehicles.
We’re credentialed and equipped to handle Clean Truck Check testing for 2013 and newer trucks over 14,000 pounds GVWR. We’re located in the heart of LA County’s commercial vehicle corridor, which means convenient access whether you’re based locally or passing through.
When you’re looking for a testing location, verify they’re actually credentialed for HD I/M testing. Ask if they have CARB-certified OBD scanning equipment. Confirm they can submit results electronically to the state system. You don’t want to waste time at a facility that can’t actually complete your test properly. We handle dozens of heavy-duty compliance tests and understand the urgency of keeping your trucks operational and compliant.
The actual OBD scan and testing process typically takes 30 to 45 minutes for a truck that’s ready and compliant. That includes connecting the diagnostic equipment, running the scan, reviewing results, and generating your documentation.
If your truck passes, we submit results to CARB electronically the same day. You walk out with printed documentation showing your test date, pass status, and next compliance deadline. Total time at our facility is usually under an hour.
If issues come up during testing—diagnostic trouble codes, system malfunctions, or other emissions control problems—we’ll need additional time to explain what the codes mean and what repairs are necessary before you can retest. But the diagnostic process itself is relatively quick. The key is scheduling your appointment during your 90-day testing window so you’re not rushing to meet a deadline. Cerritos traffic and commercial vehicle volume can affect scheduling availability, so calling ahead to book your test time is always smarter than showing up and hoping for immediate service.
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