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If you’re running 2013 or newer diesel trucks with a gross vehicle weight rating over 14,000 pounds in California, you already know the state isn’t playing around anymore. CARB’s Clean Truck Check program went into full enforcement mode in January 2025, and the consequences for missing your emissions testing aren’t just annoying—they’re expensive and operational.
We’re talking DMV registration holds that ground your trucks. Fines up to $10,000 per vehicle per day if you ignore a Notice to Submit to Testing. Out-of-state operators getting flagged and restricted from California roads entirely.
You need a passing emissions test every six months now, submitted by a CARB-credentialed tester using certified OBD testing equipment. That’s not optional. It’s not going away. And if you wait until you get that NST letter, you’ve got 30 days to get it done or face the fallout.
We handle Clean Truck Check testing for heavy-duty vehicles right here in Glendora. We’re credentialed, we know the regulations inside out, and we can test your trucks on-site at our shop or bring mobile testing to your yard. You get same-day results submitted directly to CARB, so you’re back to running loads instead of chasing compliance paperwork.
We’ve been serving Glendora’s trucking and commercial vehicle operators with straight-up emissions testing that meets California’s requirements. We’re not new to CARB regulations, and we’re definitely not learning on your dime.
Our testers are CARB-credentialed, which means we’ve completed the state’s official training course, passed the exam, and stay current with renewals every two years. We use CARB-certified OBD testing devices for 2013 and newer diesel engines, and we handle smoke opacity and visual inspections when required.
Glendora sits right in the middle of major freight corridors running through the San Gabriel Valley. You’ve got trucks moving between Ontario, the Ports of LA and Long Beach, and distribution centers all over the Inland Empire. That means you’re dealing with California CARB compliance whether your trucks are registered here or not. We get that. We also get that downtime costs you money, which is why we offer mobile testing and same-day walk-ins when you need to move fast.
First, we verify your truck qualifies for the program. That means confirming it’s model year 2013 or newer with a diesel or alternative fuel engine, and that the GVWR is over 14,000 pounds. If your truck doesn’t meet both of those criteria, this test doesn’t apply to you.
Next, we connect CARB-certified OBD testing equipment to your truck’s onboard diagnostics system. We’re scanning engine data, checking emissions performance, and looking for any fault codes or readiness monitors that could trigger a failure. For 2013+ trucks, this OBD scan is the core of the test—it’s how CARB measures whether your engine is running clean and meeting California’s air quality standards.
If your truck passes, we submit the results to CARB electronically the same day. You’ll get documentation showing you’re compliant, and that passing test gets recorded in the state system. Your registration stays clear, and you’re good for the next six months.
If something comes back flagged, we’ll walk you through what needs attention. Sometimes it’s a sensor issue or a code that needs clearing after a repair. Sometimes it’s bigger. Either way, you’ll know exactly what’s wrong and what it takes to get a passing result before the 30-day deadline hits.
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You’re getting a full CARB-compliant emissions test performed by a credentialed tester using state-certified equipment. That includes the OBD scan for 2013 and newer diesel engines, visual inspection of emissions control components, and smoke opacity testing if your truck’s configuration requires it.
We handle in-state and out-of-state trucks. If you’re an owner-operator passing through California or a fleet manager with trucks registered elsewhere, the rules still apply to you. CARB doesn’t care where your plates are from—if you’re operating on California roads, you’re subject to Clean Truck Check requirements.
Glendora’s location makes us accessible whether you’re running routes through the 210, the 10, or coming up from the 60. We’re not buried in LA traffic, and we’re not an hour out of your way. You can schedule an appointment or take advantage of same-day walk-in availability when your schedule allows.
Mobile testing is available for fleets or operators who’d rather have us come to you. We bring the certified equipment to your yard, test your trucks on-site, and submit results without pulling vehicles off your lot. That’s especially useful if you’re managing multiple trucks or dealing with tight delivery windows where every hour of downtime matters.
The Clean Truck Check requirement applies specifically to heavy-duty diesel and alternative fuel vehicles with model year 2013 or newer engines and a gross vehicle weight rating of 14,000 pounds or more. Both criteria have to be met—if your truck is older than 2013 or weighs less than 14,000 pounds GVWR, this program doesn’t apply.
This includes semi trucks, box trucks, dump trucks, and other commercial diesel vehicles operating on California’s public roads and highways. It doesn’t matter if your truck is registered in California or another state. If you’re driving it here, you’re subject to the testing requirement.
The reason for the 2013 cutoff is that those model years are equipped with onboard diagnostics systems that CARB can test electronically. Older trucks fall under different regulations. The 14,000-pound threshold targets the heavy-duty vehicles responsible for the majority of diesel emissions, even though they make up a small percentage of vehicles on the road.
Most heavy-duty vehicles subject to the program need to submit a passing Clean Truck Check test every six months. CARB tracks compliance deadlines based on your vehicle, and if you miss a deadline, you’ll receive a Notice to Submit to Testing giving you 30 days to complete the test.
If you ignore that notice or miss the 30-day window, the California DMV will place a registration hold on your vehicle. That means you can’t renew your registration until you submit a passing test. You’re also looking at potential fines up to $10,000 per vehicle per day for continued non-compliance.
The six-month interval is designed to catch emissions issues before they get worse and to ensure trucks are maintaining clean performance over time. It’s more frequent than the old smog check schedule, and it’s a direct response to California’s air quality goals. Set reminders, track your deadlines, and don’t wait until the last minute—especially if you’re managing a fleet with multiple vehicles on different schedules.
If your truck fails, you’ll get a detailed report showing what triggered the failure—whether it’s an OBD fault code, a readiness monitor issue, or something else flagged during the test. You’ll need to address whatever caused the failure and then retest before your compliance deadline.
Common failure reasons include check engine lights, incomplete readiness monitors after recent repairs, faulty sensors, or emissions control components that aren’t functioning properly. Sometimes it’s a quick fix. Sometimes it requires more involved diagnostics or parts replacement.
You’ve got 30 days from the date on your Notice to Submit to Testing to get a passing result submitted to CARB. If you’re cutting it close, don’t wait—get the truck looked at immediately so you have time to make repairs and retest. A failure isn’t the end of the world, but ignoring it or running out the clock will cost you in registration holds and potential penalties. We’ll walk you through what needs fixing and help you understand your options for getting back into compliance.
Yes. We offer mobile Clean Truck Check testing for fleets and operators in Glendora and the surrounding San Gabriel Valley area. We bring CARB-certified testing equipment directly to your yard or facility, test your trucks on-site, and submit results to CARB the same day.
Mobile testing makes sense if you’re running multiple trucks, if your vehicles are loaded or difficult to move, or if you just don’t want to deal with the hassle of driving each truck to a testing station. It minimizes downtime and keeps your operation moving while staying compliant with California’s requirements.
We also have same-day walk-in availability at our Glendora location if you’d rather bring your truck to us. Either way, you’re getting the same credentialed tester, the same certified equipment, and the same fast turnaround on results. It’s about what works better for your schedule and your operation.
Clean Truck Check testing in California typically ranges from $50 to $150 per vehicle depending on the testing provider and whether you’re getting in-house or mobile service. We offer competitive pricing for both options, and we’re transparent about costs upfront—no surprises when you show up.
Mobile testing usually costs more because we’re bringing equipment and a credentialed tester to your location, but it can save you more than the price difference if it means avoiding downtime or keeping loaded trucks on your property. For single trucks or owner-operators, in-house testing at our Glendora shop is the most cost-effective option.
What you’re paying for is CARB-certified compliance testing performed by a credentialed tester, same-day electronic submission of results to the state, and documentation that keeps your registration clear and your trucks legal to operate in California. Compare that to a $10,000-per-day fine for non-compliance or a registration hold that grounds your vehicle, and the test cost is a small price to pay for staying operational.
Yes. If your heavy-duty diesel truck meets the program requirements—2013 or newer model year and over 14,000 pounds GVWR—you’re subject to Clean Truck Check testing regardless of where your truck is registered. CARB’s regulations apply to any qualifying vehicle operating on California’s public roads and highways.
Out-of-state operators have been flagged, fined, and even restricted from entering California for non-compliance. The state is serious about enforcement, and they’re not making exceptions for trucks registered elsewhere. If you’re running loads into California regularly, you need to track your testing deadlines just like in-state operators.
We test out-of-state trucks at our Glendora location or via mobile service. We submit results to CARB electronically, and you get the same compliance documentation that keeps you legal to operate here. If you’re coming through the San Gabriel Valley, the Inland Empire, or making runs to the LA ports, plan your testing around your route and avoid the risk of getting pulled over or hit with penalties at a weigh station.
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