Hear from Our Customers
If you’re running a 2013 or newer heavy-duty truck in California, you already know CARB compliance isn’t optional. Miss your semi-annual testing deadline and you’re looking at registration holds that ground your truck until you fix it. Fail a roadside check and the fines start at $1,000 per vehicle—and climb fast from there.
You don’t have time to figure out which test you need, whether your tester is actually credentialed, or if the results will even reach CARB correctly. You need it done right, reported accurately, and finished without pulling your truck off the road longer than necessary.
That’s what CARB emissions testing in Azusa gets you. Your results go straight to the state. Your compliance record stays clean. Your registration doesn’t get flagged. And if something does come back as a failure, you’ve got up to 90 days before your deadline to get it fixed and retested—not two days before your truck gets pulled from service.
We’ve been helping truck owners and fleet operators stay compliant in Azusa and across the San Gabriel Valley for nearly two decades. We’re not new to diesel emissions or California’s regulations—we’ve been doing this since before Clean Truck Check was even a requirement.
Our testers are CARB credentialed, which means your test results are valid, recognized by the state, and submitted electronically the same day. We’re located right off the I-210 corridor, so if you’re running routes through Azusa, Baldwin Park, or Irwindale, you’re not driving an hour out of your way to get tested.
We focus exclusively on heavy-duty trucks with 2013 and newer engines over 14,000 pounds GVWR. That’s the service. That’s what we know. And that’s what keeps your operation moving without surprises.
You bring your truck in—ideally 60 to 90 days before your compliance deadline so there’s time to address anything that comes up. We plug into your OBD system using CARB certified testing equipment and pull the emissions data directly from your engine’s computer. That’s the test for 2013 and newer trucks. No smoke opacity. No visual inspections of older systems. Just OBD data.
If everything checks out, we submit your passing results to CARB electronically that same day. You’ll see the update in your CTC-VIS account, and your compliance status gets recorded with the DMV. If something fails, you’ll know exactly what the issue is—usually a sensor, a regen problem, or a code that needs clearing after a repair.
Once you get it fixed, you come back for a retest. As long as you’re within that 90-day window, you’ve got time to handle it without your registration getting flagged or your truck getting pulled at a roadside check. The whole process takes less than an hour when your truck passes, and you walk away with documentation you can keep in the cab.
Ready to get started?
This is OBD emissions testing for heavy-duty diesel trucks with 2013 or newer engines and a GVWR over 14,000 pounds. If your truck doesn’t meet both of those criteria, this isn’t the right test. Older trucks follow different rules. Lighter trucks aren’t part of the Clean Truck Check program.
You’re getting a CARB certified test performed by a credentialed tester using state-approved equipment. Your results are transmitted directly to the California Air Resources Board and logged in the CTC-VIS system. You’ll receive a certificate showing your compliance status, and that record stays active for six months until your next test is due.
Azusa sits right in the middle of one of the busiest freight corridors in Southern California. If you’re running through the San Gabriel Valley, you’re passing roadside emissions sensors on the 210, 605, and 10 every day. Those sensors flag high-polluting vehicles, and if your truck gets tagged, you’ll receive a Notice to Submit to Testing. That means you’ve got 30 days to get compliant or face penalties that start at $1,000 and go up to $10,000 per vehicle per day.
This service keeps that from happening. It also satisfies your semi-annual requirement, keeps your DMV registration clear, and gives you documentation to show during roadside inspections. Starting in October 2027, testing frequency increases to quarterly for some vehicles—so staying on top of it now means you’re already in the habit when the rules tighten.
Your compliance deadline is tied to your DMV registration expiration date. If your truck is registered in California, you’ll need to complete testing every six months. The exact due date shows up in your CTC-VIS account, which you can access online through the CARB website using your vehicle’s VIN.
You can submit a passing test up to 90 days before your deadline. That window exists so you have time to address any failures and retest without missing your due date. If you wait until the last week and something fails, you’re in a tough spot—your registration can get held up, and your truck might not be legally operable until you’re compliant.
If you’re an out-of-state operator just passing through California, you’re still required to comply if your truck meets the criteria. CARB doesn’t exempt non-residents. You’ll need to create a CTC-VIS account, pay the annual compliance fee, and submit to testing just like California-based trucks.
You’ll get a report showing exactly what failed—usually a fault code, a sensor issue, or an incomplete readiness monitor. The OBD system in your truck tracks dozens of emissions-related functions, and if any of them aren’t operating correctly, the test won’t pass.
Most failures are fixable. Sometimes it’s as simple as completing a regen cycle or clearing a code after a recent repair. Other times it’s a sensor that needs replacing or a component in the emissions control system that’s malfunctioning. Either way, you’ll know what the issue is before you leave.
Once you get the repair done, you come back for a retest. As long as you’re still within your 90-day testing window, you’ve got time to handle it without penalties. If you’re cutting it close to your deadline and the repair takes longer than expected, that’s when registration holds and fines start becoming a real problem. That’s why testing early matters.
No. This service is specifically for heavy-duty trucks with a GVWR over 14,000 pounds and a model year 2013 or newer engine. If your truck is older than 2013 or weighs less than 14,000 pounds, it’s not part of the Clean Truck Check program and doesn’t require OBD emissions testing under these rules.
Older heavy-duty trucks follow different testing requirements, usually involving smoke opacity tests and visual inspections of emissions control components. Lighter commercial vehicles might fall under standard smog check rules depending on their weight and configuration. But the CARB compliance testing we’re talking about here—the semi-annual OBD testing through the Clean Truck Check program—only applies to that specific category of newer, heavier trucks.
If you’re not sure whether your truck qualifies, check your registration or look up your VIN in the CTC-VIS system. The state tracks which vehicles are subject to the program, and your account will show whether you’re required to test. Don’t assume you’re exempt just because you’re an owner-operator or you don’t run a large fleet. The rules apply to individual trucks, not company size.
The state charges an annual compliance fee that’s separate from the testing fee. For 2025, that fee is $31.18 per vehicle. It goes up slightly to $32.13 in 2026. You pay that fee once a year through your CTC-VIS account, and it’s required whether you pass or fail your tests.
The actual testing fee varies depending on where you go. Some facilities charge a flat rate, others charge based on how long the test takes or whether it’s your first test or a retest. You’re paying for the tester’s time, the use of CARB certified equipment, and the electronic submission of your results to the state.
What you’re really paying for is avoiding the alternative. A single day of downtime because your truck isn’t compliant can cost you $300 to $900 in lost revenue. A fine for operating a non-compliant vehicle starts at $1,000 and can go up to $10,000 per vehicle per day. A registration hold means your truck doesn’t move until you’re compliant. Compared to those costs, the testing fee is minor. You’re buying proof that your truck is legal to operate and your business can keep running.
You can get tested at any CARB certified Clean Truck Check location in California. It doesn’t have to be in Azusa. But if you’re running routes through the San Gabriel Valley or you’re based anywhere near the 210 corridor, testing locally saves you time and keeps your truck closer to your operating area.
The key is making sure the facility you choose is actually certified and the tester is credentialed. Not every smog check station can perform Clean Truck Check testing. The equipment has to be CARB approved, the tester has to hold a current credential, and the results have to be transmitted electronically to the state. If any of those pieces are missing, your test won’t count.
We check all those boxes. We’ve been testing heavy-duty trucks for years, we’re certified by CARB, and our testers hold the credentials required to make your results valid. You’re not driving to LA or out to the Inland Empire hoping the facility knows what they’re doing. You’re getting it done locally by people who’ve been doing this since before the program existed.
A standard smog check applies to passenger vehicles and lighter trucks under 14,000 pounds. It tests tailpipe emissions, checks for evaporative leaks, and inspects emissions control components. It’s required every two years for most vehicles when you renew your registration.
CARB compliance testing—also called Clean Truck Check—is specifically for heavy-duty trucks over 14,000 pounds with 2013 or newer engines. It’s an OBD-based test that pulls data directly from your truck’s computer. There’s no tailpipe test. No visual inspection. Just a scan of your emissions control system to make sure everything is functioning correctly and within CARB standards. And it’s required every six months, not every two years.
The two programs serve different vehicle categories and have different testing methods, different frequencies, and different reporting systems. You can’t satisfy your Clean Truck Check requirement by getting a regular smog check, even if the facility offers both services. The equipment, the tester credentials, and the reporting process are completely separate. If your truck falls under the Clean Truck Check program, that’s the test you need—and it has to be done by a CARB certified facility with credentialed testers who know how to handle heavy-duty diesel emissions.
Local Resources
Useful Links
Other Services we provide in Azusa
