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If you’re running a 2013 or newer diesel truck over 14,000 pounds in California, you already know CARB compliance isn’t optional. It’s the law. And the penalties for skipping it aren’t just annoying—they’re expensive and operational.
We’re talking fines up to $10,000 per vehicle per day. DMV registration holds that keep your truck parked. Roadside flags that pull you off your route. All because you missed a smog test or didn’t know your compliance deadline.
You don’t need another headache. You need to get tested, get your certificate, and get back on the road. That’s what we do here in Castaic. We handle CARB emissions testing for heavy-duty trucks so you stay compliant, avoid penalties, and keep your operation moving without the runaround.
All SMOG Motors has been serving Castaic and the surrounding areas with reliable emissions testing and smog services. We’re not new to this. We understand the regulations, the testing requirements, and what it takes to keep your semi truck California CARB compliant.
Our location right off Interstate 5 makes us easy to reach whether you’re local or passing through. Castaic sits at a major trucking crossroads, and we’ve built our service around that reality. You’re not looking for a lecture or a sales pitch—you’re looking for someone who can test your truck correctly and get you moving.
We use CARB-certified testing equipment and our team stays current on the regulations. You’re dealing with people who actually know what they’re doing.
First, we confirm your truck qualifies. That means it’s model year 2013 or newer and has a gross vehicle weight rating over 14,000 pounds. If it doesn’t meet both of those criteria, this service doesn’t apply.
Once we verify eligibility, we run the OBD-II emissions test using CARB-approved testing devices. This isn’t a visual inspection or a quick plug-in. It’s a full diagnostic check that measures your truck’s emissions output against California’s standards. The test itself doesn’t take long, but it has to be done right.
If your truck passes, you get your Clean Truck Check certificate on the spot. That certificate is what you need to satisfy CARB requirements and keep your DMV registration active. If something comes back flagged, we’ll walk you through what needs attention and what your next steps are. No surprises. No runaround.
You’re in and out with what you need. That’s the process.
Ready to get started?
This is OBD-II emissions testing for heavy-duty diesel trucks that meet California’s Clean Truck Check requirements. You’re getting a full diagnostic scan that checks your engine’s emissions systems against CARB standards. We’re looking at NOx output, particulate matter, and whether your truck’s onboard systems are functioning within legal limits.
Castaic sees thousands of trucks roll through every week on I-5. Most of them are compliant. Some aren’t. The ones that aren’t either don’t know they’re required to test, or they’re putting it off. Neither of those situations ends well. CARB uses roadside monitoring devices that flag high emitters. Once you’re flagged, you get a Notice to Submit to Testing. You’ve got 30 days to provide passing results or face penalties.
Right now, most trucks with 2013+ engines need testing twice a year. Starting in October 2027, that jumps to four times a year. The requirements aren’t getting easier. If your truck falls into this category and you’re operating in California—even if you’re registered out of state—you’re subject to the same rules. We handle the testing so you stay ahead of enforcement, keep your registration clear, and avoid the fines that come with non-compliance.
If your truck is model year 2013 or newer and has a gross vehicle weight rating over 14,000 pounds, yes. It doesn’t matter if you’re registered in California or out of state. If you operate in California, you’re required to comply with CARB’s Clean Truck Check program.
This applies to semi trucks, tractor-trailers, heavy-duty diesel trucks, and even large motorhomes with diesel engines over that weight threshold. The program started in January 2023 and enforcement is active. Roadside devices monitor emissions, and if your truck gets flagged as a high emitter, you’ll receive a notice requiring you to test within 30 days.
If you’re not sure whether your truck qualifies, bring in your registration or VIN. We can confirm eligibility before we do anything else. But if you’re running a newer heavy-duty diesel in California, odds are you’re covered by this regulation.
Right now, most trucks with 2013 or newer engines need CARB emissions testing twice a year. That’s every six months. You’ll receive compliance deadlines from CARB, and you’ve got a 90-day window before each deadline to complete your test.
Starting in October 2027, the frequency increases. Trucks with OBD-equipped engines will need testing four times a year. That’s a significant jump, and it’s worth planning for now if you’re managing a fleet or running your own rig.
Missing a deadline isn’t just an inconvenience. It triggers a registration hold with the California DMV. Your truck can’t be renewed, and technically, it can’t legally operate until you’re compliant again. The testing schedule is strict, but it’s predictable. As long as you stay on top of your deadlines, you won’t have issues.
If your truck doesn’t pass, the test results will show what’s out of spec. Usually, it’s an issue with the emissions control system—something like a malfunctioning sensor, a DPF problem, or an engine code that’s throwing off the readings.
You’ll need to get the issue repaired before you can retest. We can point you toward what needs attention, but the actual repair work has to be done by a qualified mechanic. Once the repairs are complete, you come back for a retest.
Here’s the part that matters: you’re on a clock. If you’ve already received a Notice to Submit to Testing, you’ve got 30 days from that notice to provide passing results. If you’re testing ahead of your compliance deadline, you’ve got more breathing room. Either way, don’t sit on a failed test. The longer you wait, the closer you get to penalties, registration holds, and potential fines that start at $10,000 per vehicle per day.
Yes. If your truck operates in California, it’s subject to California’s emissions regulations regardless of where it’s registered. That includes trucks registered in Nevada, Arizona, Oregon, or anywhere else.
CARB’s Clean Truck Check program applies to all heavy-duty vehicles operating within the state. If you’re an interstate driver and your route brings you through California, you’re required to comply. If you get flagged by a roadside emissions monitor or pulled into an inspection, your out-of-state plates won’t exempt you from the rules.
We test plenty of out-of-state trucks here in Castaic. The process is the same. Bring in your truck, we run the OBD test, and if it passes, you get your certificate. If you’re running regular routes through California, it’s worth staying current on your testing schedule so you’re not scrambling to find a facility when you get a compliance notice.
The actual test doesn’t take long—usually 30 to 45 minutes depending on the truck and whether any issues come up during the diagnostic scan. We’re running an OBD-II test, which pulls data directly from your truck’s onboard systems.
What takes time is making sure the truck is ready to test. Your engine needs to be warmed up, and certain readiness monitors need to show complete. If you roll in with a cold engine or after a recent battery disconnect, the system might not be ready, and we’ll have to wait or reschedule.
Plan for about an hour start to finish if everything goes smoothly. If you’re coming off I-5 and need to get back on the road fast, call ahead so we know you’re coming. We’ll do everything we can to keep things moving, but we can’t skip steps. The test has to be done right, or it doesn’t count.
The California DMV will place a registration hold on your vehicle. That means you can’t renew your registration, and technically, your truck isn’t legal to operate until you’re compliant. If you’re caught operating a non-compliant vehicle, you’re looking at fines up to $10,000 per vehicle per day.
If your truck gets flagged as a high emitter and you receive a Notice to Submit to Testing, you’ve got 30 days to provide passing results. Miss that window, and the penalties kick in. CARB doesn’t mess around with enforcement. This isn’t a “we’ll get to it eventually” situation.
Beyond the fines, there’s the operational cost. A truck that can’t be registered is a truck that’s not generating revenue. Downtime is expensive. The smog test itself is a small cost compared to what happens if you ignore it. Stay on schedule, keep your certificate current, and you won’t have to deal with any of this.
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