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Your truck sitting idle costs you money. Every day you’re waiting on CARB compliance testing is a day you’re not hauling, not billing, not operating.
California’s Clean Truck Check program requires semi-annual emissions testing for diesel trucks with 2013 or newer engines and a GVWR over 14,000 pounds. Miss it, and the DMV blocks your registration. Fail to comply, and you’re looking at fines up to $10,000 per vehicle per day.
We come to you. We test on-site at your yard or warehouse in Hawthorne, CA and throughout LA County. Results upload immediately to the CARB system, and most compliant vehicles show cleared in the portal within one to three business days. You get back on the road faster, with proof of compliance in hand and no registration surprises at renewal time.
All SMOG Motors is a CARB-credentialed testing provider serving Hawthorne, CA and the surrounding South Bay and LA County areas. We’ve spent over 15 years navigating California emissions regulations, and we only work with the vehicles that actually fall under the Clean Truck Check mandate.
That means if your truck is model year 2013 or newer and has a GVWR over 14,000 pounds, we can help. If it doesn’t meet both of those criteria, this service doesn’t apply—and we’ll tell you that upfront.
Hawthorne sits right in the middle of major freight corridors. You’re close to LAX, the 405, the 110, and the ports. That means heavy enforcement, high visibility, and zero room for non-compliance. We understand the local landscape, and we’re set up to keep your operation moving without the bureaucratic runaround.
First, we confirm your truck qualifies. That means verifying the model year is 2013 or newer and the GVWR is over 14,000 pounds. If it doesn’t meet both, the Clean Truck Check program doesn’t apply to your vehicle.
Once confirmed, we schedule your mobile test at your location in Hawthorne, CA or anywhere in our service area. Our CARB-credentialed tester arrives with certified OBD testing equipment. We plug into your truck’s onboard diagnostics system and run the emissions test right there on-site. The whole process typically takes 15 to 30 minutes per vehicle.
If your truck passes, we upload the results immediately to California’s CARB database. You’ll receive your Clean Truck Check certificate, and the DMV hold—if there was one—clears in real time. If there’s an issue, we’ll walk you through what needs to happen next, whether that’s a repair referral or a retest timeline.
You’re not left guessing. You know where you stand, what’s compliant, and when you’re clear to operate.
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This is OBD-based emissions testing for diesel trucks that fall under California’s HD I/M program. We’re testing the onboard diagnostics system to confirm your truck meets CARB emissions standards. It’s not a visual inspection. It’s not an opacity test unless your truck is older and falls under a different program. This is specifically for 2013 and newer heavy-duty vehicles.
You get mobile service, meaning we come to your facility in Hawthorne, CA or surrounding areas. You get same-day or next-day scheduling in most cases. You get immediate upload of passing results to the state system. And you get a compliance certificate you can show during roadside inspections or submit for registration renewal.
Starting in 2025, all applicable trucks must be tested every six months. Some will eventually move to quarterly testing by 2027. That’s four times a year. If you’re running a fleet, that’s a lot of appointments—and a lot of potential downtime if you’re driving to a fixed testing location. We eliminate that. You stay on your property. We handle the rest.
Hawthorne, CA fleets near the 405 and Century Boulevard corridors are especially vulnerable to CARB roadside monitoring. Enforcement is active. Compliance isn’t optional. This service keeps you ahead of it.
Only if your truck meets two specific criteria: it has a model year of 2013 or newer, and it has a gross vehicle weight rating over 14,000 pounds. Both have to be true.
If your truck is older than 2013, this program doesn’t apply to you. If it’s under 14,000 pounds GVWR, it’s also not covered under the Clean Truck Check mandate. The state created this program specifically for newer heavy-duty diesel trucks because those engines are equipped with onboard diagnostics systems that can be tested electronically.
If you’re unsure whether your truck qualifies, check your vehicle registration or the door placard for the GVWR and model year. You can also call us, and we’ll confirm eligibility before scheduling anything. There’s no point in testing a vehicle that doesn’t fall under the rule.
The DMV will block your registration renewal. That means your truck can’t legally operate on California roads, even if your tags haven’t expired yet.
CARB tracks compliance through the Clean Truck Check database. If your vehicle is due for testing and you haven’t completed it, the state notifies the DMV. The DMV then places a hold on your registration. You won’t be able to renew until you complete the test and submit proof of compliance.
On top of that, operating a non-compliant vehicle can result in fines starting at $1,000 and going up to $10,000 per vehicle per day depending on the violation. CARB also conducts roadside inspections and monitors smoking trucks. If you’re flagged, you’ll be required to test immediately. It’s not worth the risk. Testing twice a year is a lot easier than dealing with a registration block or a five-figure fine.
If your truck passes, the results upload to the CARB system immediately. Most vehicles show as compliant in the state portal within one to three business days.
That’s when the DMV hold clears and your registration status updates. You’ll also receive a Clean Truck Check certificate that you can keep in the truck for proof during inspections or renewals.
If your truck doesn’t pass, we’ll let you know on-site what the issue is. Common failures include active fault codes, incomplete readiness monitors, or emissions system malfunctions. From there, you’ll need to address the repair and schedule a retest. We can point you toward qualified repair shops if needed, but the fix has to happen before you can pass and get compliant. The faster you handle it, the faster you’re back in operation.
Yes. If your out-of-state truck operates in California and meets the criteria—2013 or newer, over 14,000 pounds GVWR—you’re required to comply with the Clean Truck Check program.
It doesn’t matter where your truck is registered. If you’re driving in California, CARB regulations apply to you. That includes trucks based in Nevada, Arizona, Oregon, or anywhere else that cross state lines for deliveries, drayage, or freight hauling.
Out-of-state operators are often surprised by this, but CARB enforcement doesn’t stop at the border. Roadside inspections happen on the 405, the 110, near the ports, and along major freight routes around Hawthorne, CA and LA County. If you’re flagged and can’t show proof of compliance, your truck can be sidelined until you test. We work with out-of-state fleets regularly. We’ll test your vehicle, upload the results, and get you the certificate you need to keep moving through California legally.
We come to you. That’s the whole point of mobile CARB compliance testing.
You don’t need to pull your truck off a job, drive across town, and wait in line at a testing facility. We bring the certified equipment to your yard, warehouse, or job site in Hawthorne, CA and throughout the LA County area. You schedule a time that works for your operation, and we show up ready to test.
This is especially useful if you’re running multiple trucks. We can test your entire fleet in one visit without disrupting your dispatch schedule. Each test takes 15 to 30 minutes. You stay on-site. Your drivers stay on schedule. And you’re not losing half a day to compliance.
Mobile service also means fewer miles on your trucks and less fuel burned just to meet a state requirement. For fleets operating near LAX, the ports, or the South Bay industrial corridor, it’s the most efficient way to stay compliant without sacrificing productivity.
Right now, most trucks under the Clean Truck Check program need testing every six months. That’s twice a year.
Starting in 2025, all applicable heavy-duty vehicles must comply with that semi-annual schedule. Some vehicles will eventually move to quarterly testing—four times a year—by 2027, depending on how the program phases in.
If you’re running a fleet, that’s a lot of tests to track. Miss one, and you’re dealing with registration holds and potential fines. The state doesn’t send reminders. It’s on you to stay ahead of the schedule.
We recommend setting up recurring appointments so you’re never scrambling at the last minute. We work with fleet managers in Hawthorne, CA who need consistent testing schedules across multiple trucks. We’ll come out on a regular cadence, test everything in one visit, and keep your compliance documentation organized. You focus on running your business. We’ll make sure your trucks stay legal.
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