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You’re not dealing with registration holds at the DMV. You’re not scrambling to find a CARB certified smog check before a 30-day deadline runs out. Your trucks aren’t sitting idle while you lose $500+ per day in revenue.
You’re running your business. Your fleet stays on the road. Your drivers stay on schedule.
That’s what CARB compliance actually gets you when it’s handled right. California’s Clean Truck Check program isn’t optional anymore—testing deadlines started January 1, 2025, and the state isn’t messing around. If your heavy-duty vehicle is model year 2013 or newer with a diesel engine, or 2018 or newer with alternative fuel, and it’s over 14,000 pounds GVWR, you’re required to test twice a year. By October 2027, that jumps to four times annually.
We bring the test to your location in Maywood. You stay compliant without the trip, the wait, or the stress. Results upload directly to the CTC-VIS system the moment you pass. No paperwork. No follow-up calls. Just done.
All SMOG Motors started because the people behind it spent 25 years as owner-operators in the construction industry. We’ve been on your side of the CARB regulations—dealing with the confusion, the notices, the pressure to stay legal while keeping equipment working.
Now we’re CARB credentialed testers serving Maywood and the surrounding areas. We use state-certified OBD testing equipment that meets every official requirement. We know the rules because we had to follow them ourselves.
Maywood sits right in the heart of LA County’s industrial corridor. If you’re running trucks through here—whether you’re local or just passing through California—you’re subject to the same Clean Truck Check requirements as every other operator in the state. We’ve built our service around the reality that your time matters and your trucks need to stay in service.
You schedule a time that works for your operation. We come to your yard, job site, or wherever your truck is in Maywood. No need to drive anywhere or wait in line.
We connect our CARB-certified OBD testing device to your truck’s diagnostic system. The scan pulls data directly from your engine’s onboard diagnostics—this is required for all 2013 and newer diesel engines and 2018 and newer alternative fuel engines operating over 14,000 pounds GVWR. The test checks emissions control systems, fault codes, and compliance status.
If your truck passes, we upload the results immediately to California’s CTC-VIS system. CARB and the DMV both see that you’re compliant. If there’s an issue, we’ll tell you exactly what needs attention before you can pass. No surprises. No runaround.
Most tests take under 30 minutes. You get a compliance certificate. Your vehicle record updates with CARB and DMV. You’re legal and back to work.
Ready to get started?
This isn’t a standard smog test for passenger cars. This is heavy-duty vehicle compliance testing under California’s Clean Truck Check program, and it’s specific to trucks over 14,000 pounds.
We test OBD-equipped vehicles—2013 and newer diesel engines, 2018 and newer alternative fuel engines. We scan for emissions system faults, check readiness monitors, verify that your diesel particulate filter and other emissions controls are functioning. The test meets every CARB requirement because we’re using their certified equipment and following their exact protocols.
In Maywood, you’re likely running trucks for freight, construction, logistics, or municipal work. The state estimates this program covers roughly 1 million heavy-duty trucks and buses operating in California. If you received a Notice to Submit Test (NST) from CARB, you have 30 days to submit a passing result. If you’re due for registration, the DMV checks your compliance status before they’ll process it.
We handle same-day service when you need it. We provide instant reporting so there’s no lag between your test and your compliance status updating. And if you operate multiple trucks, we scale with you—one truck or 500, the process stays efficient.
If your truck doesn’t pass, we’ll tell you exactly why. The OBD scan identifies specific fault codes or emissions system issues that are causing the failure. Common problems include malfunctioning diesel particulate filters, issues with selective catalytic reduction systems, or readiness monitors that haven’t completed their checks.
You’ll need to get those issues repaired before you can pass. We don’t do the repairs ourselves, but we’ll explain what needs fixing so you can take it to your mechanic with clear information. Once repairs are done, we come back and retest.
The important part: don’t wait. If you received a 30-day notice from CARB, that clock is ticking. If repairs take time, you need to know that early so you’re not scrambling at the deadline. And if your registration is coming up, a failed test means the DMV can place a hold on your registration until you’re compliant.
Testing costs vary depending on whether you need mobile service, how many trucks you’re testing, and your scheduling needs. What we can tell you is this: the cost of the test is a fraction of what non-compliance costs you.
CARB fines run up to $10,000 per vehicle, per day. If your truck is out of service due to a registration hold, you’re losing revenue every day it sits. Annual compliance costs—including inspections, testing, and any repairs—typically range from $2,500 to $4,500 per vehicle, plus the $31 annual CARB fee. But that’s the cost of doing business in California with heavy-duty diesel equipment.
Our mobile service saves you the downtime of driving to a test facility and waiting. For fleet operators in Maywood running tight schedules, that’s worth more than the test fee itself. Call us for specific pricing based on your situation.
Yes. If your out-of-state truck operates on California roads and meets the weight and model year requirements, you’re subject to Clean Truck Check. This applies to interstate carriers, out-of-state trucking companies, and anyone bringing heavy-duty equipment into California for work.
The rules don’t care where your truck is registered. They care where it operates. If you’re running loads through Maywood or anywhere else in California, and your truck is 2013 or newer diesel (or 2018 or newer alternative fuel) over 14,000 pounds GVWR, you need to comply.
Out-of-state operators who don’t comply face the same penalties as California-based fleets—up to $10,000 per vehicle per day, plus the state can prevent your truck from operating here. We work with out-of-state carriers regularly. The process is the same: we test, you pass, results go to CARB, you’re legal to operate in California.
Right now, most heavy-duty vehicles need testing twice a year. That’s the current requirement for OBD-equipped trucks under the Clean Truck Check program. You’ll receive notices from CARB when your testing is due, and you have 30 days from the notice date to submit a passing test.
Starting October 2027, the frequency increases to four times per year for OBD-equipped vehicles. That’s a significant jump, and it means compliance becomes even more of a regular operational concern. The state is tightening enforcement because they’re targeting air quality improvements—CARB estimates this program will prevent 7,500 air quality-related deaths and 6,000 hospitalizations between 2023 and 2050.
For fleet operators in Maywood, this means building testing into your maintenance schedule. Waiting until you get a notice isn’t the best strategy when you’re testing multiple times a year. We work with fleets to set up regular testing schedules so you’re never caught off guard.
Technically, yes. Anyone can become a CARB credentialed tester by passing the state exam and maintaining current certification. You’d also need to purchase or lease a CARB-certified OBD testing device, which isn’t cheap, and you’d need to stay current on all program updates and testing protocols.
For most fleet operators, that’s not worth it. You’re in the business of moving freight, running equipment, or managing logistics—not becoming a compliance testing specialist. The time and cost to get credentialed, buy equipment, and handle all the reporting requirements usually doesn’t pencil out unless you’re running a massive fleet.
We’re already credentialed, already equipped, and already handling dozens of tests. We come to you in Maywood, test your trucks on-site, and upload results immediately. You stay focused on your business. That’s the value of using a mobile testing service instead of trying to DIY your compliance.
A regular smog check is for passenger vehicles and light-duty trucks under 14,000 pounds. It tests tailpipe emissions at a smog station. CARB compliance testing under the Clean Truck Check program is completely different—it’s for heavy-duty vehicles over 14,000 pounds, and it uses OBD diagnostics instead of tailpipe testing.
We’re not checking your exhaust with a probe. We’re scanning your truck’s onboard diagnostic system to verify that emissions controls are working correctly. The test looks at fault codes, readiness monitors, and the performance of systems like your diesel particulate filter and selective catalytic reduction. It’s a data-based test, not a physical emissions measurement.
This is why you can’t just take your semi truck to a regular smog shop in Maywood. They’re not equipped for heavy-duty compliance testing, and they’re not credentialed for the Clean Truck Check program. You need a CARB credentialed tester with the right OBD equipment—and that’s what we provide.
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