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You’re running a tight operation. Every hour a truck sits idle is money you’re not making. The Clean Truck Check requirement isn’t going away, and the penalties for skipping it aren’t small. We’re talking $10,000 per vehicle per day, plus DMV registration holds that can shut down your entire operation.
Here’s what compliance actually looks like: your trucks stay on the road. No surprise fines. No scrambling to find a tester when you’re already behind schedule. No wondering if your results made it to CARB or if you’re about to get flagged at a weigh station.
We handle OBD emissions testing for heavy-duty diesel and alternative fuel vehicles over 14,000 pounds GVWR. Model year 2013 or newer. The test takes 15 to 30 minutes, we submit results directly to the state system, and you get back to work. That’s it.
This isn’t about adding another task to your week. It’s about checking the box the right way so you can focus on what actually makes you money. You need this done twice a year starting now, and four times a year by 2027. Might as well work with someone who understands that your time matters.
All SMOG Motors is a CARB-credentialed Clean Truck Check tester serving Maywood, CA and the surrounding Los Angeles County area. We’ve been doing emissions testing for over seven years, and we’re one of the few mobile testers in the region that’s fully licensed and insured. That matters more than you might think.
Maywood sits right in the heart of LA’s logistics corridor. You’ve got freight moving through here constantly, which means enforcement is paying attention. CARB uses roadside monitoring and automated plate readers to flag high-emitting vehicles. If your truck gets pulled and you’re not compliant, that’s a problem that costs you real money.
We come to your yard, your dock, wherever your trucks are parked. We use CARB-approved testing equipment, and we know the regulations inside and out because we deal with them every single day. You’re not our first rodeo, and you won’t be our last. We’ve worked with independent owner-operators, fleet managers, and logistics companies that need this done right without the runaround.
First, you schedule an appointment. Same-day service is available if you’re in a bind. We show up at your location with CARB-certified OBD testing equipment. No need to drive anywhere or pull trucks off a job.
We plug into your truck’s onboard diagnostics system and run the emissions test. This checks for fault codes, monitors system performance, and verifies that your diesel emissions controls are working the way California says they need to. The whole thing takes 15 to 30 minutes per vehicle. If you’ve got a fleet, we can knock them out one after another without disrupting your operation.
Once the test is complete, we submit the results directly to CARB through their secure reporting system. You don’t have to log in anywhere or mail anything. It’s handled. If your truck passes, you’re good for the next six months. If there’s an issue, we’ll tell you exactly what needs attention so you can get it fixed and retested.
This applies to trucks with a GVWR over 14,000 pounds that are model year 2013 or newer. Older trucks and lighter vehicles don’t qualify under the current Clean Truck Check program. If you’re not sure whether your fleet falls under this, we can walk you through it when you call. No guessing, no surprises.
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You’re getting a CARB HD I/M test performed by a credentialed inspector using state-approved equipment. That’s the baseline. But what you’re really paying for is the convenience of mobile service, the assurance that results are submitted correctly, and the peace of mind that comes from working with someone who’s insured and accountable.
In Maywood and across LA County, there are plenty of people offering smog checks. Not all of them are certified for Clean Truck Check. Not all of them are insured. And not all of them understand the difference between a standard smog test and the heavy-duty CARB diesel compliance requirements that went into effect in 2024. We do this specific type of testing, and we do it all day.
You also get transparency. We’ll tell you upfront what the test costs, what it covers, and what happens if your truck doesn’t pass. No upselling, no pressure to buy parts from us. We’re not a repair shop. We’re testers. If something needs fixing, you handle that however you want, then we come back and retest.
For fleet operators, we offer volume pricing and can coordinate inspections so you’re not juggling schedules across multiple drivers. We’ve tested trucks at ports, airports, freight yards, and private lots all over the area. TSA clearance, government contracts, utility companies—we’ve worked with them all. You’re in good company.
If your truck is model year 2013 or newer and has a gross vehicle weight rating over 14,000 pounds, it needs a Clean Truck Check. This includes heavy-duty diesel trucks and alternative fuel vehicles that operate in California, whether they’re registered in-state or out-of-state.
The requirement kicked in October 2024, and compliance deadlines started rolling out in January 2025. CARB estimates this affects around 36,900 California-registered trucks and up to 192,400 out-of-state trucks that operate here regularly. If you’re running freight through California, this applies to you.
Right now, testing is required every six months. Starting in October 2027, OBD-equipped vehicles will need testing four times a year. The rules are getting stricter, not looser, so it’s worth building this into your maintenance schedule now rather than waiting until enforcement catches up with you.
Pricing varies depending on whether you need mobile service or can bring the truck to a testing location. Most testers in the area charge between $50 and $190 per test, with mobile fees on top of that. We offer competitive pricing and transparent quotes—no hidden fees or surprise charges.
For fleet operators, we provide volume pricing that makes it easier to budget for multiple trucks. If you’ve got five trucks or fifty, we can work out a rate that makes sense for your operation. The key is planning ahead rather than waiting until the last minute and paying premium rates for emergency service.
Keep in mind that the cost of the test is a fraction of what you’d pay in penalties if you skip it. A single violation can run $10,000 per vehicle per day, plus DMV registration holds that prevent you from operating legally. Compliance is cheaper than the alternative, every single time.
If your truck fails, we’ll give you a detailed report of what triggered the failure. Usually it’s a fault code in the OBD system or an emissions control component that’s not performing within CARB’s limits. You’ll need to get that issue repaired before the truck can pass a retest.
We don’t do repairs ourselves, so there’s no conflict of interest. You can take the truck to your regular mechanic, a dealership, or any shop you trust. Once the repair is done, we come back and retest. If it passes, we submit the clean results to CARB and you’re good to go.
The important thing is not to ignore a failure. CARB tracks compliance through their database, and if your truck is flagged as non-compliant, you risk enforcement action. That could mean fines, registration holds, or getting pulled at a weigh station. Fix it, retest it, and move on. It’s not the end of the world, but it does need to be handled.
Yes, same-day service is available depending on our schedule and your location. If you’re in Maywood or nearby in LA County, we can usually accommodate urgent requests. The test itself only takes 15 to 30 minutes, so as long as we can get to you, we can get you compliant fast.
This is especially helpful if you’re facing a deadline or just realized your compliance window is closing. A lot of operators don’t think about Clean Truck Check until they’re up against a registration renewal or a scheduled inspection. We get it. Things slip through the cracks when you’re busy running a business.
The best approach is to schedule ahead, but if you need us today, call us. We’ll tell you straight up whether we can make it work. No runaround, no maybes. Either we can do it or we can’t, and if we can’t, we’ll point you toward someone who can.
No. We come to you. That’s the whole point of mobile CARB emissions testing. Whether your trucks are parked at your yard, a warehouse, a freight terminal, or even a job site, we bring the equipment and perform the test on-site.
This saves you time and keeps your trucks in service longer. You don’t have to pull a driver off a route, arrange transportation, or sit in line at a testing station. We show up, plug in, run the test, and submit the results. You keep moving.
For fleet operators in Maywood, this is a huge advantage. You can schedule all your trucks back-to-back and knock out compliance in a single visit. We’ve done this for companies with dozens of vehicles, and it’s always faster and less disruptive than trying to coordinate individual appointments at a brick-and-mortar location.
We submit results directly through CARB’s secure reporting system as soon as the test is complete. You’ll get confirmation that the submission went through, and you can verify compliance status yourself by checking your vehicle’s record in the CARB database using your VIN.
This is one of the reasons it matters to work with a credentialed tester. We have access to the official reporting system, and we’re required to submit results accurately and on time. If we don’t, we lose our credentials. That accountability protects you.
Some operators worry about whether their compliance is actually on file, especially if they’ve had issues in the past with paperwork getting lost or not processed. With Clean Truck Check, everything is digital and traceable. Once it’s in the system, it’s in the system. You’re not relying on mail or manual data entry. It’s handled electronically, and you can confirm it yourself if you want peace of mind.
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