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California’s Clean Truck Check program started enforcement in January 2025. If your heavy-duty diesel trucks aren’t compliant, you’re looking at fines that can hit $10,000 per vehicle per day. That’s not a scare tactic—that’s what CARB can legally impose.
Beyond the financial hit, non-compliance means your trucks can’t be registered. The DMV will place a hold on your registration until you fix the problem. Your truck sits. Your contracts suffer. Your customers start looking elsewhere.
The program applies specifically to trucks with a gross vehicle weight rating over 14,000 pounds and a model year of 2013 or newer. If that describes your fleet, you need CARB emissions testing twice a year right now—and that’s increasing to four times annually starting October 2027. There’s no way around it if you operate in California.
We serve the Whittier, CA area and greater Los Angeles County with CARB-certified testing for heavy-duty vehicles. We’re not a general smog shop trying to figure out diesel compliance on the fly. This is what we do.
Whittier sits right in the heart of Southern California’s trucking corridors. You’ve got the 605, the 5, routes into the ports, and connections to distribution centers across LA County. That means your trucks need to stay compliant to keep moving through one of the busiest commercial vehicle regions in the country.
We understand the pressure you’re under. Downtime costs money. Confusion about regulations costs money. We’re here to make the compliance process as straightforward as possible so you can get back to work.
First, we verify your truck qualifies for the program. That means confirming it’s a 2013 or newer model year with a GVWR over 14,000 pounds. If it doesn’t meet those specs, the Clean Truck Check program doesn’t apply to your vehicle.
Once we confirm eligibility, we perform the required OBD testing. For 2013 and newer diesel engines, CARB requires onboard diagnostics testing using certified equipment. We plug into your truck’s system, run the diagnostics, and check for any emission-related fault codes or system malfunctions.
After testing, you get documentation showing your compliance status. If your truck passes, you’re good for the next testing cycle. If there’s an issue, we’ll explain what needs to be addressed and what your timeline looks like. CARB gives you 30 days to comply if your vehicle gets flagged, so timing matters.
You’ll also need to make sure your vehicle is registered in the CTC-VIS system before operating on California roads. We can walk you through that process if you haven’t done it yet.
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Right now, trucks with 2013+ engines need emissions testing twice per year. That frequency increases to four times annually starting in October 2027. Each test involves OBD diagnostics to check your emission control systems.
There’s also an annual compliance fee. As of 2026, that’s $32.13 per vehicle. It’s not a huge cost, but it’s mandatory, and missing it can trigger registration issues.
In Los Angeles County, where Whittier is located, the stakes are higher because of the sheer volume of commercial vehicle traffic. CARB enforcement is active here. Roadside inspections happen. If you’re pulled over and can’t show current compliance documentation, you’re facing penalties on the spot.
For fleets operating interstate, this applies to you too. It doesn’t matter if your trucks are registered in Nevada, Arizona, or anywhere else. If you’re driving through California, CARB compliance is required. Out-of-state operators get caught off guard by this all the time.
The other thing to know: shippers are also on the hook. If a shipping company uses a non-compliant carrier, they can face their own $10,000 annual fine. That means your customers are checking your compliance status. Losing a contract because you’re not certified is a real risk.
No. The Clean Truck Check program specifically applies to heavy-duty vehicles with 2013 or newer model year engines and a GVWR over 14,000 pounds.
If your truck is a 2012 or older model, you’re not subject to this program. That doesn’t mean you have no emissions requirements—California has other regulations depending on your vehicle type and weight—but the Clean Truck Check testing and fees don’t apply.
The 2013 cutoff exists because that’s when onboard diagnostics became standard in heavy-duty diesel engines. The testing relies on OBD systems, which older trucks don’t have in the same way.
Currently, trucks with 2013 or newer engines need testing twice per year. That’s the requirement as of 2025.
Starting in October 2027, the frequency increases to four times per year. CARB is phasing in the higher testing schedule, so you’ll need to adjust your maintenance and compliance planning accordingly.
Each test involves OBD diagnostics to check your emission control systems. You’ll receive documentation after each test showing your compliance status. Keep those records with you—they matter during roadside inspections and audits.
If your truck fails, CARB issues a Notice to Submit to Testing. You have 30 days to address the issue and retest.
During that 30-day window, you need to figure out what’s causing the failure—whether it’s a faulty sensor, an emission control system problem, or something else—and get it fixed. Once repairs are done, you come back for another test.
If you don’t comply within the 30 days, you’re looking at registration holds and potential fines. The DMV won’t renew your registration until the compliance issue is resolved. That means your truck can’t legally operate, which is why acting fast matters.
Yes. If your truck meets the criteria—2013 or newer model year, over 14,000 pounds GVWR—it needs to comply with CARB regulations when operating in California, regardless of where it’s registered.
This catches a lot of interstate operators off guard. You might be based in another state, but California’s rules apply the moment you cross the border. That includes testing, fees, and registration in the CTC-VIS system.
Enforcement happens at weigh stations, during roadside inspections, and at border checkpoints. If you can’t show compliance documentation, you’re facing penalties and potential impoundment. It’s worth getting ahead of this before your first California run.
The annual compliance fee is $32.13 per vehicle as of 2026. That’s the state-mandated cost you pay directly to CARB.
Testing costs vary depending on the provider. For a single vehicle, you’re looking at somewhere between $225 and $701 annually when you factor in testing fees and compliance costs. For larger fleets, the numbers add up—seven trucks can run between $772 and $2,180 per year.
Those costs don’t include repairs if your truck fails testing. If you need to fix emission control systems or replace faulty components, that’s additional. The key is staying on top of maintenance so you’re not scrambling to make repairs under a 30-day deadline.
CTC-VIS stands for Clean Truck Check Vehicle Information System. It’s CARB’s database for tracking heavy-duty vehicle compliance.
If your truck is subject to the Clean Truck Check program, it needs to be registered in CTC-VIS before you operate it on California roads. Registration links your vehicle identification number to your compliance records, testing history, and fee payments.
You can register online through CARB’s system. You’ll need your VIN, vehicle details, and owner information. Once registered, your compliance status is tracked automatically. This is what enforcement officers check during inspections, and it’s what the DMV references when processing your registration.
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