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You already know the stakes. Miss a compliance deadline and you’re looking at fines starting at $1,000 per day, per vehicle. The DMV can hold your registration. Your trucks sit. Your business stops.
California’s Clean Truck Check program went live October 1, 2024. If you operate heavy-duty diesel trucks—model year 2013 or newer with a gross vehicle weight rating over 14,000 pounds—you’re required to complete emissions compliance testing on a set schedule. First major deadline hits January 1, 2025, and every truck needs to pass before then.
This isn’t a suggestion. It’s law. And it applies to nearly every semi truck, heavy-duty diesel vehicle, and commercial fleet operating in California. The testing measures NOx emissions and ensures your trucks meet CARB standards designed to cut air pollution across the state.
What happens after you’re compliant? You operate without interruption. No surprise notices. No scrambling to find a credentialed tester at the last minute. No explaining to your clients why their freight is delayed because your truck got flagged.
We operate right here in Rosemead, CA—strategically located near the I-605 and SR-22 corridors where most of Southern California’s heavy-duty trucking traffic flows. We’re not a mobile unit that might show up late or a national chain that doesn’t understand local operations.
We’re credentialed through CARB’s Clean Truck Check program. That means we’ve completed the required training, passed the exam, and we’re authorized to perform the compliance testing your trucks need to stay registered and operational in California.
Rosemead sits in the heart of the San Gabriel Valley’s distribution network. If you’re running freight through this area, you know how tight schedules are and how much a compliance issue can cost you. We’re here because this is where the trucks are—and where the need is highest.
First, your truck needs to be registered in the Clean Truck Check Vehicle Inspection System, or CTC-VIS. If you haven’t done that yet, we can walk you through it. You’ll also need to pay the annual compliance fee—around $30 per vehicle—before testing.
When you bring your truck in, we connect to the onboard diagnostics system and run the CARB-required emissions test. We’re checking NOx output and making sure your vehicle meets the standards California set to reduce smog-forming pollution. The test itself doesn’t take long, but it has to be done right.
If your truck passes, we submit the results directly to CARB through the CTC-VIS system. You get a passing certificate, your compliance is recorded, and you’re good until your next testing window. If something comes back flagged, we’ll tell you exactly what needs attention before you can retest.
Here’s the part that matters: if you get a Notice to Submit to Testing from CARB, you have 30 days to get a passing test on file. Not 30 business days. 30 days total. Missing that window triggers penalties immediately. We’ve seen it happen, and it’s not worth the risk.
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This service applies specifically to trucks that are model year 2013 or newer and have a gross vehicle weight rating over 14,000 pounds. If your truck is older than 2013 or weighs less than 14,000 pounds, it’s not subject to this program. Don’t waste time trying to get tested if your vehicle doesn’t meet those criteria—CARB won’t accept the results.
For trucks that do qualify, the testing measures emissions output through your onboard diagnostics system. We’re looking at NOx levels primarily, which are the main target of California’s air quality regulations. The goal is to catch high-emitting vehicles before they rack up thousands of miles polluting at levels that contribute to smog and health problems across the state.
Rosemead’s location makes this especially relevant. You’re operating in one of the most heavily regulated air quality zones in the country. The South Coast Air Quality Management District has some of the strictest standards anywhere, and CARB enforcement is active here. We’ve seen trucks pulled over for compliance checks on the 10, the 60, and the 605. If you’re not current, you’ll find out the hard way.
Starting in 2025, testing happens twice a year for most trucks. By 2027, if your truck is OBD-equipped, that jumps to four times per year. The requirements are only getting tighter. Getting ahead of it now means you’re not scrambling later when the testing windows shrink and the penalties get worse.
Any heavy-duty truck that’s model year 2013 or newer and has a gross vehicle weight rating over 14,000 pounds. That includes semi trucks, heavy-duty diesel vehicles, and most commercial trucks operating in California.
It doesn’t matter if you’re based out of state. If your truck operates in California, it’s subject to CARB compliance rules. The program covers nearly all diesel and alternative fuel heavy-duty vehicles, including buses and other commercial equipment over that 14,000-pound threshold.
If your truck is older than 2013 or weighs less than 14,000 pounds, this program doesn’t apply to you. CARB’s Clean Truck Check is specifically targeting newer heavy-duty vehicles because that’s where the emissions impact is highest and where onboard diagnostics make testing feasible.
You’ll pay an annual compliance fee to CARB—currently between $30 and $31.18 per vehicle. That fee goes directly to the state and covers your registration in the CTC-VIS system.
On top of that, you’ll pay for the actual emissions testing each time it’s required. Testing costs vary depending on the provider, but you’re looking at a reasonable fee per test. The real cost comes if you don’t stay compliant. Fines start at $1,000 per day, per vehicle, and can escalate to $10,000 or more depending on the violation.
We’ve seen companies hit with penalties in the tens of thousands because they missed a deadline or didn’t realize their trucks were subject to the program. The testing fee is small compared to what non-compliance will cost you in fines, downtime, and lost business.
If your truck doesn’t pass, you’ll need to address whatever issue is causing the elevated emissions before you can retest. We’ll tell you exactly what came back flagged so you know what needs repair or adjustment.
Common issues include problems with the diesel particulate filter, exhaust gas recirculation system, or selective catalytic reduction components. Sometimes it’s a sensor issue. Sometimes it’s actual mechanical wear that’s affecting emissions output.
Once you’ve made the repairs, you come back for a retest. You’re not penalized for failing the first time, but you are on the clock. If you received a Notice to Submit to Testing, that 30-day window doesn’t pause just because you failed. You need to get a passing result submitted to CARB within that timeframe or you’ll face penalties.
Right now, testing happens twice a year—semiannually—starting in 2025. Your specific testing windows depend on your vehicle’s registration and compliance group, but you’ll receive notices from CARB telling you when your truck is due.
By October 2027, the frequency increases to four times per year for OBD-equipped vehicles. That’s quarterly testing, which means you’ll need to stay on top of your schedule or risk falling out of compliance quickly.
Each testing window gives you 90 days to submit a passing test before your deadline hits. Don’t wait until the last week. If your truck fails and needs repairs, you’ll need time to fix it and retest before that window closes. We’ve seen too many operators wait until the final days and then panic when something doesn’t pass.
Yes. If your truck operates in California, it doesn’t matter where it’s registered. You’re required to comply with CARB’s Clean Truck Check program, and you can get tested here in Rosemead, CA.
Out-of-state operators sometimes assume they’re exempt, but that’s not how it works. California enforces compliance on any heavy-duty vehicle operating within state borders. If you’re running freight into or through California, your 2013 or newer truck over 14,000 pounds needs to be registered in CTC-VIS and current on testing.
We’re located right off major trucking routes, so it’s easy to stop in when you’re passing through the area. Just make sure you’ve already registered your vehicle in the system and paid your annual fee before you come in for testing. Without that registration, we can’t submit your results.
The DMV can place a hold on your vehicle registration, which effectively grounds your truck until you get compliant. On top of that, you’re looking at fines starting at $1,000 per day, per vehicle. Those fines can escalate quickly depending on how long you’re out of compliance and whether CARB determines the violation was intentional.
We’ve also seen cases where businesses that hire non-compliant carriers face penalties between $1,000 and $10,000 per year. That means even if you’re not the truck owner, using a non-compliant vehicle can cost you.
The enforcement is real. CARB has already issued significant fines to major transportation companies for non-compliance. They’re not giving warnings. If your truck is flagged and you’re not current, the penalties start immediately. The only way to avoid it is to stay ahead of your testing schedule and make sure every truck in your fleet is current before the deadline hits.
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