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Your trucks stay on the road. That’s what matters.
When your CARB compliance is current, the DMV doesn’t flag your registration. You’re not scrambling to explain to a customer why a delivery is delayed. You’re not watching fines stack up at $1,000 to $10,000 per vehicle, per day.
California’s Clean Truck Check program applies to nearly every diesel and alternative fuel heavy-duty vehicle with a GVWR over 14,000 pounds operating on public roads. If your truck has a 2013 or newer model year engine, it needs OBD testing to verify emission control systems are working. Miss that requirement, and the state puts a hold on your registration until you fix it.
The testing itself takes less time than most operators expect. What takes longer is dealing with the fallout when you skip it. Roadside enforcement, surprise compliance letters from CARB, customers questioning your legitimacy—all avoidable.
Montebello sits at the center of California’s trucking operations, twenty minutes from the largest deep water port in the Western United States and within ten minutes of the state’s densest concentration of railroad yards. That means higher visibility, more enforcement, and zero tolerance for non-compliance. Getting tested here keeps you ahead of the problem instead of reacting to it.
We’re a CARB-certified testing facility in Montebello. We handle emissions testing for heavy-duty trucks with 2013 or newer model year engines and a GVWR over 14,000 pounds.
We don’t test older trucks. We don’t test lighter vehicles. We focus on what the Clean Truck Check program requires for the specific equipment operating in and around Montebello’s port, rail, and distribution networks.
Montebello’s trucking industry isn’t new to regulations, but CARB’s enforcement has gotten sharper. Fleet operators here deal with tighter timelines, higher scrutiny, and real financial consequences for falling behind. We’re located where the work happens, and we understand what’s at stake when a truck can’t operate.
You bring your truck in. We verify it meets the program requirements—2013 or newer model year engine, GVWR over 14,000 pounds.
Then we run the OBD test. This checks your truck’s onboard diagnostic system to confirm emission control components are functioning properly. It’s not a visual inspection. It’s a data-driven test that CARB uses to monitor real-world compliance across California’s heavy-duty fleet.
If your truck passes, you get a compliance certificate on the spot. That certificate updates your record with the DMV and clears any registration holds. If something’s flagged, we’ll tell you exactly what needs attention before you can retest.
The process is straightforward. Most operators are in and out faster than they expect. What matters is that your truck’s status is current, your registration isn’t blocked, and you’re not dealing with surprise penalties when you’re trying to run your business.
CARB collected over $21 million in penalties in 2022. Most of those violations were avoidable. Testing takes an hour. Fines compound daily. The math isn’t complicated.
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This is OBD testing for trucks with 2013 or newer engines and a GVWR over 14,000 pounds. We connect to your truck’s diagnostic system and pull emission control data that CARB requires for Clean Truck Check compliance.
You’ll receive a compliance certificate immediately after passing. That certificate is what the DMV checks when your registration comes up for renewal. Without it, they can block your registration and ground your truck until the issue is resolved.
Montebello’s location makes compliance even more critical. You’re operating near California’s busiest freight corridors, where CARB runs roadside monitoring stations and sends compliance letters to operators whose trucks are flagged for visible smoke or system failures. Proactive testing keeps you off that list.
The compliance fee increased to $32.13 as of January 2026, reflecting the program’s expansion and stricter enforcement. Every diesel truck operating in California is now part of this system. The state estimates the program will prevent 7,500 air quality-related deaths and 6,000 hospitalizations through 2050, which means enforcement isn’t going away—it’s getting tighter.
Your test results go directly into the state’s database. You don’t have to file paperwork or follow up with the DMV separately. Once you’re compliant, you’re clear until your next testing cycle.
If your truck has a 2013 or newer model year engine and a GVWR over 14,000 pounds, yes. California’s Clean Truck Check program requires OBD emissions testing for nearly all heavy-duty diesel and alternative fuel vehicles operating on public roads.
This applies whether you’re based in Montebello or just passing through. The DMV checks compliance status when your registration comes up for renewal. If you’re not current, they’ll place a hold on your registration until you complete the required testing.
Trucks with older engines or lighter weight ratings have different requirements, but if you’re running a semi or heavy-duty commercial vehicle in California, assume you’re covered under this program. The state doesn’t make exceptions based on how often you operate in California—if the truck touches public roads here, it needs to comply.
The DMV will block your registration. That means your truck can’t legally operate in California until you complete the required testing and clear the hold.
Beyond the registration issue, CARB can issue fines ranging from $1,000 to $75,000 per day depending on the severity of the violation. Those fines compound daily, so a week of non-compliance can turn into a five- or six-figure problem fast.
Roadside enforcement is also a factor. CARB monitors trucks at weigh stations and uses remote sensing technology to flag vehicles with visible smoke or emission system failures. If your truck gets flagged, you’ll receive a compliance letter requiring you to bring it in for testing. Ignoring that letter doesn’t make it go away—it escalates the penalties and puts your operating authority at risk.
Most OBD tests take less than an hour. You’re not waiting around all day.
The test itself is quick—we connect to your truck’s diagnostic system, pull the emission control data, and verify everything meets CARB’s standards. If your truck passes, you get your compliance certificate immediately and you’re done.
If something’s flagged during the test, we’ll tell you what needs attention. You’ll need to address the issue and come back for a retest, but at least you’ll know exactly what’s wrong instead of finding out during a roadside inspection or when the DMV blocks your registration. Downtime costs money—traditional manual inspections can take one to three hours per vehicle and cost $300 to $900 in lost productivity. OBD testing is faster and gets you back on the road quicker.
No. We only test trucks with 2013 or newer model year engines and a GVWR over 14,000 pounds.
Older trucks fall under different testing requirements—typically OVI (Opacity and Visual Inspection) instead of OBD testing. We’re certified specifically for the OBD testing that applies to newer heavy-duty vehicles under California’s Clean Truck Check program.
If your truck doesn’t meet those criteria, you’ll need to find a facility that handles the testing method your vehicle requires. CARB’s website has a lookup tool where you can verify which testing applies to your specific truck based on model year, weight rating, and engine type. Don’t assume all smog check stations handle heavy-duty compliance—many only test passenger vehicles, and the equipment and certification requirements are completely different.
CARB compliance testing for heavy-duty trucks is more specific than a standard smog check. It’s part of California’s HD I/M (Heavy-Duty Inspection and Maintenance) program, which targets commercial vehicles over 14,000 pounds GVWR.
For trucks with 2013 or newer engines, the test uses OBD diagnostics to check emission control systems in real time. It’s not a tailpipe test or visual inspection—it’s a data pull from your truck’s computer that verifies everything is functioning as designed.
Standard smog checks apply to passenger vehicles and lighter trucks. The testing methods, equipment, and certification requirements are different. When people say “smog check,” they’re usually talking about cars—not the semi trucks and heavy-duty commercial vehicles that fall under CARB’s Clean Truck Check program. If you’re operating a heavy-duty diesel truck in California, you need CARB-certified emissions testing, not a regular smog check.
We provide Clean Truck Check testing for heavy-duty trucks in Montebello. We’re certified to perform OBD emissions testing for vehicles with 2013 or newer model year engines and a GVWR over 14,000 pounds.
Once your truck passes the test, you receive a compliance certificate immediately. That certificate updates your record with the DMV and clears any registration holds. You don’t have to submit paperwork separately—the results go directly into the state’s system.
Montebello’s central location near California’s port and rail infrastructure makes it a logical testing hub for operators running freight through Southern California. Getting tested locally saves time and keeps your trucks moving instead of sitting in a queue at a facility that’s backed up or doesn’t specialize in heavy-duty compliance. You’re already operating in the area—get the testing done where it’s convenient and get back to work.
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