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If you’re running heavy-duty trucks in California, you already know the drill. Every diesel or alternative fuel truck over 14,000 pounds with a 2013 or newer engine needs to pass Clean Truck Check testing. Miss it, and the DMV blocks your registration. That means trucks sitting idle, loads getting delayed, and revenue walking out the door.
We bring CARB certified testing directly to your location in Claremont and across the Inland Empire. You don’t drive to us. We come to your yard, your shop, or wherever your trucks are parked. Most tests wrap up in under an hour, and you get the compliance certificate you need to keep operating without interruption.
This isn’t about jumping through hoops. It’s about protecting your ability to do business in California without the constant worry that a compliance deadline is going to shut you down. You submit your passing test up to 90 days before your deadline, and you’re covered. No registration blocks. No enforcement action. Just clean paperwork and clear roads.
We’ve been testing emissions for over two decades, and we’ve been CARB certified for Clean Truck Check since the program started gaining traction. We’ve completed more than 250 Clean Truck Checks, and we know exactly what CARB looks for during compliance audits.
Claremont sits right in the heart of the Inland Empire’s freight corridors. Trucks moving through here are hauling goods between the ports, the rail yards, and distribution centers across Southern California. That means tight schedules and zero tolerance for delays. We built our mobile service around that reality. You need testing done fast, done right, and done without pulling trucks off the road for half a day.
We’re licensed, insured with $2 million in liability coverage, and we use the same opacity testing equipment the state uses. Our team is CARB trained, and we stay current on every regulatory update so you don’t have to.
First, you schedule a time that works for your operation. We bring our CARB certified testing equipment to your location—your yard, your facility, wherever the trucks are. No need to route drivers to a testing center or lose hours coordinating logistics.
When we arrive, we run a full On-Board Diagnostics test on your 2013 or newer diesel engine. This checks the truck’s emissions control systems in real time and confirms everything is functioning within CARB’s compliance standards. The test itself usually takes less than an hour per truck. If you’re running a fleet, we can move through multiple vehicles in a single visit.
Once the truck passes, we submit the results directly to CARB and provide you with the official Clean Truck Check certificate. That certificate is what keeps your registration clear and your trucks legal to operate in California. If there’s an issue, we’ll walk you through what needs to be fixed and help you get back into compliance as quickly as possible. No runaround. No confusion. Just clear next steps.
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You’re not just getting a smog test. You’re getting CARB HD I/M compliance testing designed specifically for heavy-duty diesel trucks operating under California’s strictest emissions regulations. This applies only to trucks with a gross vehicle weight rating over 14,000 pounds and model year 2013 or newer engines. If your truck doesn’t meet both of those criteria, this isn’t the service you need.
Here’s what’s included: full OBD system diagnostics using CARB approved testing devices, opacity testing that meets SAE J1667 specifications, real-time compliance reporting, and direct submission of passing results to the state. You also get help with clean truck check registration if you’re new to the program, plus all the documentation you need for your records or fleet management system.
In Claremont and the surrounding Inland Empire, most of the trucks we test are drayage vehicles moving freight between Ontario, San Bernardino, and the LA ports. These operators can’t afford downtime, and they can’t risk a registration block during peak shipping season. That’s why mobile testing matters. We work around your schedule, not the other way around. You keep your trucks moving, and we handle the compliance piece without disrupting your operation.
Your truck qualifies if it meets two specific requirements: it has a gross vehicle weight rating over 14,000 pounds, and the engine is model year 2013 or newer. This includes most heavy-duty diesel trucks, hybrid trucks, and diesel buses operating in California. It does not include lighter commercial vehicles, older trucks with pre-2013 engines, or vehicles under 14,000 pounds GVWR.
If you’re not sure whether your truck qualifies, check the door placard for the GVWR and the engine model year. Those two numbers tell you everything you need to know. If you’re still unsure, reach out and we’ll confirm eligibility before scheduling anything. There’s no point in booking a test if your truck doesn’t fall under the CARB HD I/M program requirements.
Starting January 1, 2025, all qualifying trucks need to pass two Clean Truck Checks per year. That requirement jumps to four per year in 2027. If you’re running a fleet, now’s the time to map out your testing schedule so you’re not scrambling when deadlines hit.
You can submit a passing Clean Truck Check up to 90 days before your compliance deadline. That’s a three-month window, and it’s there to give you flexibility. If you know your deadline is coming up in March, you can get tested in December and have it count toward that requirement.
This matters because it lets you plan testing around your schedule instead of waiting until the last minute and hoping you can find an available slot. It also gives you time to address any issues if the truck doesn’t pass on the first try. Waiting until the week before your deadline is a gamble. If something fails, you’re racing the clock to get repairs done and retested before the DMV blocks your registration.
Most fleet operators we work with in Claremont schedule their tests at least 30 to 60 days out. That way, if there’s a problem, they have breathing room to fix it without pulling trucks off active routes. If you’re an owner-operator with one or two trucks, the same logic applies. Get ahead of it, and you won’t be stressed when the deadline shows up.
If your truck fails, you’ll get a detailed report showing exactly what triggered the failure. Most failures come from issues with the emissions control system—things like a faulty diesel particulate filter, problems with the selective catalytic reduction system, or sensor malfunctions that prevent the OBD system from monitoring properly.
Once you know what’s wrong, you can take the truck to a qualified repair shop to fix the issue. After repairs are done, you’ll need to get retested. We can come back out and run the test again once you’re confident the problem is resolved. There’s no penalty for failing the first time, but you do need a passing test submitted by your compliance deadline or the DMV will block your registration.
The key is not to ignore a failure or assume it’ll fix itself. CARB’s testing standards are strict, and if the OBD system is flagging a problem, it’s real. Address it, get it repaired, and get retested. That’s the only way to stay compliant and keep your trucks on the road legally in California.
Yes, if your truck operates in California, it needs to comply with CARB regulations regardless of where it’s registered. That means out-of-state trucks hauling freight through California are subject to the same Clean Truck Check requirements as California-registered vehicles. If you’re based in Nevada, Arizona, or anywhere else but you’re running loads into or through California, this applies to you.
CARB enforces compliance at weigh stations, ports, and rail yards. If your truck gets pulled for an inspection and you can’t show proof of a passing Clean Truck Check, you’re looking at fines and potential impoundment. It doesn’t matter that your plates say Oregon or Texas. If the truck is operating in California and it meets the weight and model year criteria, it needs to pass the test.
We work with out-of-state operators regularly, especially those running drayage routes between the Inland Empire and the LA-Long Beach port complex. If you’re passing through Claremont or staging loads in the area, we can meet you wherever your trucks are parked and get the testing done while you’re between runs. No need to route to a fixed testing location or lose time hunting down a CARB certified facility.
Most Clean Truck Check tests take less than an hour per truck. The actual OBD diagnostics and opacity testing usually wrap up in 30 to 45 minutes, depending on the truck and whether there are any initial system errors that need a second look. If everything checks out clean, we submit the results and provide your certificate on the spot.
If you’re scheduling testing for a fleet, we can move through multiple trucks in a single visit. The more trucks you have ready to test in one location, the more efficient the process becomes. We’ve done back-to-back testing for fleets with 10, 20, even 50 trucks, and we can coordinate timing so it doesn’t disrupt your dispatch schedule.
The mobile aspect is what saves you the most time. You’re not sending drivers across town to a testing center, waiting in line, and hoping they get back before their next load. We come to you, test on-site, and your trucks stay exactly where they need to be. For operators in Claremont running tight freight schedules, that hour of testing beats a half-day detour any time.
A regular smog check is what passenger vehicles and lighter commercial trucks go through for DMV registration. Clean Truck Check is a completely different program. It’s part of CARB’s Heavy-Duty Inspection and Maintenance program, and it’s designed specifically for heavy-duty diesel and alternative fuel trucks over 14,000 pounds with 2013 or newer engines.
The testing itself is more advanced. Clean Truck Check uses On-Board Diagnostics to monitor emissions control systems in real time, plus opacity testing to measure visible smoke from the exhaust. It’s not a tailpipe emissions test like you’d see on a car. It’s a full system diagnostic that checks whether the truck’s emissions equipment is working the way CARB requires.
You can’t just go to any smog shop and get a Clean Truck Check done. The facility has to be CARB certified specifically for HD I/M testing, and the technicians have to be trained and credentialed by the state. We’re certified for both, which is why we can handle everything from passenger vehicle smog checks to full heavy-duty truck compliance testing. If you’re running trucks in California, you need the right test from the right provider, or it doesn’t count.
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