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Your trucks pass inspection. Your DMV registration goes through without a hold. You don’t get flagged at a weigh station or hit with a Notice to Submit to Testing that puts a vehicle out of commission for 30 days.
That’s what compliance looks like when it’s handled correctly. No surprises at renewal time. No scrambling to find a testing facility that actually knows what they’re doing. No wondering if your fleet is about to cost you ten grand per truck in penalties because someone missed a deadline.
Starting in 2025, every heavy-duty diesel truck operating in California—whether you’re registered here or not—has to get tested twice a year. The state isn’t sending reminders. They’re using roadside sensors and pulling data at weigh stations. If your truck is flagged, you’ve got 30 days to get it tested or it’s off the road. And if you’re a shipper hiring non-compliant carriers, you’re on the hook too.
We’re a CARB-certified testing facility in San Dimas, CA, and we specialize in one thing: emissions testing for trucks that are model year 2013 or newer with a GVWR over 14,000 pounds. That’s it. We don’t test older trucks. We don’t test passenger vehicles. We focus on the exact segment that California is regulating under the Heavy-Duty Inspection and Maintenance program.
Our technicians are CARB-credentialed, which means they’ve completed the state’s training course, passed the certification exam, and use only approved OBD testing equipment. We’re not a general smog shop trying to figure out heavy-duty compliance on the fly. This is what we do.
San Dimas sits right in the heart of the San Gabriel Valley, where trucking routes intersect with some of the strictest air quality enforcement in the country. If you’re running trucks through Southern California, you know the regulations aren’t getting looser. We’re here because the demand is real and the stakes are high.
You bring in your truck—2013 or newer, over 14,000 pounds GVWR. We plug into the OBD system using CARB-certified diagnostic equipment. The test pulls data directly from your truck’s onboard computer to check emissions performance against California’s standards.
If your truck passes, you get a certificate that goes into the state’s system. That certificate clears your vehicle for DMV registration and keeps you compliant for the next six months. If it doesn’t pass, we’ll tell you exactly what the issue is so you can get it fixed and come back for a retest.
The whole process takes about 30 minutes if everything’s in order. You’re not waiting around all day. You’re not dealing with a shop that’s guessing at the requirements. We run the test, document the results, and get you back on the road.
This isn’t complicated if you’re working with people who know the regulations. The state requires semi-annual testing now, which means you need to plan for it twice a year. Miss a cycle and you risk getting flagged. Get flagged and you’re on a 30-day countdown to fix it or park the truck.
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You’re paying for a CARB-certified emissions test using state-approved OBD diagnostic equipment. You’re getting a credentialed technician who knows the difference between a 2012 and a 2013 truck and why that matters. You’re getting documentation that satisfies California’s Heavy-Duty Inspection and Maintenance program requirements.
Here’s what’s included: the OBD scan, the emissions data report, the compliance certificate if you pass, and entry into the state database so your records are current. You also get clarity on what happens next—whether that’s scheduling your next test in six months or addressing a failure before it becomes a bigger problem.
In San Dimas and across California, the enforcement is real. CARB collected over $21 million in penalties in 2022 alone. Trucks are being monitored at weigh stations and by roadside sensors. If your vehicle is flagged as a high emitter, you get a Notice to Submit to Testing. You’ve got 30 days. After that, the fines start—and they can hit $10,000 per vehicle per day.
The annual compliance fee is $31.18 for 2025, and that’s separate from the testing itself. But the testing is what keeps you legal. It’s what prevents your registration from being blocked. It’s what keeps your trucks moving instead of sitting in a yard waiting for someone to figure out what went wrong.
Yes. If your truck operates in California, it has to comply with CARB regulations regardless of where it’s registered. The state doesn’t care if your plates are from Nevada, Arizona, Texas, or anywhere else. If the truck is model year 2013 or newer and has a GVWR over 14,000 pounds, it needs to be tested twice a year.
California uses roadside monitoring and weigh station data to track heavy-duty vehicles. Out-of-state trucks get flagged just like in-state trucks. If you get a Notice to Submit to Testing, you’ve got 30 days to comply no matter where your registration is from.
A lot of owner-operators and fleet managers don’t realize this until they get pulled over or flagged at a weigh station. By then, you’re on the clock. The smarter move is to get ahead of it and schedule your testing before the state comes looking for you.
If your truck fails, you’ll get a detailed report showing exactly what triggered the failure. Most failures come down to sensor issues, exhaust system problems, or engine performance that’s outside California’s emissions standards. You’ll need to get the issue repaired and then come back for a retest.
The state gives you time to fix it, but if you’ve already been flagged with a Notice to Submit to Testing, that 30-day window is still running. Fail the test on day 20 and you’ve got 10 days left to repair and retest. Miss that deadline and the truck can’t legally operate in California until you’re compliant.
We don’t do the repairs ourselves, but we’ll tell you exactly what needs to be addressed so you’re not guessing. Once the work is done, bring it back and we’ll run the test again. If it passes, you’re clear for the next six months.
Starting in 2025, you need to test every six months. That’s twice a year for every qualifying truck in your fleet. The state isn’t sending reminders. You’re responsible for tracking your own compliance schedule and making sure each vehicle gets tested on time.
If you miss a cycle, you risk getting flagged by roadside monitoring or at a weigh station. Once you’re flagged, you get a Notice to Submit to Testing and you’ve got 30 days to comply. After that, the penalties start piling up—up to $10,000 per vehicle per day.
Looking ahead, the state is moving to quarterly testing by 2027. That means four times a year. The regulations are tightening, not loosening. The best approach is to build testing into your maintenance schedule now so it doesn’t catch you off guard later.
No. We only test trucks that are model year 2013 or newer with a GVWR over 14,000 pounds. That’s the specific segment covered under California’s Heavy-Duty Inspection and Maintenance program. Older trucks fall under different regulations and require different testing procedures.
This isn’t about turning away business. It’s about doing the work correctly. The OBD testing equipment we use is designed for 2013 and newer engines. The CARB certification our technicians hold is specific to this testing protocol. If we tested a 2010 truck, the results wouldn’t be valid and you’d be wasting your time and money.
If your truck is older than 2013, you’ll need to find a facility that handles pre-2013 diesel emissions testing. We focus exclusively on the newer segment because that’s where the current enforcement and regulatory pressure is concentrated.
Bring your vehicle registration and any previous CARB compliance certificates if you have them. We’ll need to verify the truck’s VIN, model year, and GVWR to confirm it qualifies for testing. If you’ve been issued a Notice to Submit to Testing from CARB, bring that too so we can document the compliance response.
The testing itself pulls data directly from your truck’s OBD system, so we don’t need maintenance records or repair history. But if you’ve recently had work done on the exhaust or emissions system, it’s helpful to know that in case something shows up during the scan.
Once the test is complete, we’ll give you a certificate if you pass, and that certificate gets logged in the state’s database. You’ll want to keep a copy for your records, especially if you’re managing multiple trucks. It’s proof of compliance if you get stopped at a weigh station or audited by CARB enforcement.
Testing costs vary depending on the facility, but you’re looking at a straightforward diagnostic test using CARB-certified equipment. The state also charges an annual compliance fee of $31.18 for 2025, which is separate from the testing fee itself. That compliance fee goes directly to CARB, not to the testing facility.
What you’re really paying for is avoiding the alternative. A single day of non-compliance can cost you up to $10,000 in fines. A truck that can’t renew its registration because of a compliance hold isn’t generating revenue. A Notice to Submit to Testing that you ignore turns into penalties that add up fast.
The cost of testing twice a year is a rounding error compared to what happens if you skip it. And if you’re running a fleet, multiply that risk by every truck you’ve got on the road. The math isn’t complicated. Stay compliant or pay exponentially more when enforcement catches up with you.
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