What trucks are required to get a Clean Truck Check in California?

Any diesel or alternative-fuel heavy-duty vehicle with a GVWR over 14,000 pounds operating on California public roads is generally subject to the carb Clean Truck Check program. This includes semi-trucks, commercial buses, fleet vehicles, motorcoaches, and some privately owned heavy-duty vehicles. The rule can also apply to out-of-state vehicles that operate in California. All Smog Motors specializes in mobile digital OBD testing for 2013 or newer diesel engines in Los Angeles and Riverside counties.

How often do I need to get my truck tested for carb compliance?

Most subject heavy-duty trucks must submit passing Clean Truck Check results twice per year (semi-annually). California-registered trucks follow DMV renewal dates; out-of-state trucks follow a VIN-based schedule. Beginning October 2027, OBD-equipped trucks (model year 2013+) are scheduled to move to quarterly testing — four times per year. You can submit passing results up to 90 days before your deadline.

What happens if my truck fails the Clean Truck Check emissions test?

A failed Clean Truck Check OBD test means the vehicle may not be compliant with California heavy-duty emissions requirements. Common causes include an active Malfunction Indicator Light (MIL), active or permanent Diagnostic Trouble Codes (DTCs) related to the DPF, SCR, or EGR systems, or readiness monitors showing 'not ready' because codes were recently cleared. All Smog Motors provides the specific diagnostic codes but does not perform repairs — a qualified mechanic must fix the issue before retesting.

Can I still operate my truck in California if I'm not compliant with Clean Truck Check?

No. Operating a non-compliant covered heavy-duty vehicle on California public roads can result in DMV registration holds, substantial financial penalties, roadside enforcement stops, and compliance delays. carb uses roadside emissions monitoring to flag high-emitting vehicles. All Smog Motors provides fast mobile OBD testing throughout Los Angeles and Riverside counties, with most inspections completed in 10–15 minutes.

How much does Clean Truck Check testing cost?

The total compliance cost includes the state-mandated carb annual compliance fee ($32.13 per vehicle for 2026, paid directly to carb via CTC-VIS) plus All Smog Motors' mobile testing service fee, which covers technician travel to your location, the 10–15 minute OBD scan, and electronic submission through CTC-VIS. Fleet pricing and a 5–10% military discount for active-duty members and veterans are available. Contact All Smog Motors for current rates.

Do I need to do anything after my truck passes the Clean Truck Check test?

All Smog Motors handles electronic submission to carb's CTC-VIS database. After passing, download your compliance certificate from your CTC-VIS account (credit/debit payments process in 1–2 business days; eCheck up to 7 days). If your vehicle had a DMV registration hold, allow 3–5 business days for the DMV system to update. Confirm your annual compliance fee is paid in CTC-VIS, as carb will not issue a certificate until payment is complete.

CARB Compliance Los Angeles & Riverside County, CA

Keep Your Truck Road-Legal Without the Downtime

Digital emissions testing for 2013 or newer heavy-duty trucks over 14,000 lbs GVWR. Fast OBD data download, submitted directly to California’s database, so you avoid DMV registration holds and keep rolling.

CARB Certified Testing Equipment

State-approved OBD devices download emissions data directly from your truck’s computer, meeting all California Air Resources Board standards.

Credentialed Testers on Staff

Our team holds valid CARB tester certifications after completing the official state training course and passing the required exam.

Direct CTC-VIS Submission

Test results are automatically uploaded to the state database, giving you proper compliance documentation without extra steps on your end.

Heavy-Duty CARB Emissions Testing in California

Fast, Mobile Digital Testing for Trucks Over 14,000 lbs

If you’re running a 2013 or newer heavy-duty truck with a GVWR over 14,000 pounds in California, you’re required to undergo Clean Truck Check emissions testing twice a year. This isn’t optional. The state actively uses roadside sensors to flag high emitters, and non-compliance means DMV registration holds, steep fines, and trucks sitting idle.

At All SMOG Motors, we keep you compliant without the downtime. We perform digital emissions testing by downloading data directly from your truck’s ECU and submitting it straight to the State of California’s CTC-VIS database. Here is how we make the modern OBD testing method work for you:

100% Mobile Convenience: Bypass the shop wait times. We travel directly to your truck stop, fleet yard, or roadside location across Los Angeles and Riverside counties.
10–15 Minute Turnaround: No smoke tests. No taking your truck out of service for hours. Just a rapid diagnostic test to capture the exact data California requires.
Heavy-Duty Exclusive: We strictly service commercial and semi-trucks over 14,000 lbs. We don’t do passenger cars or general repairs—our only focus is heavy-duty compliance.
Direct Communication: Skip the corporate red tape with direct phone and text scheduling, including emergency support to get grounded trucks cleared quickly.

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All Smog Motors

Need a quick estimate?

Stay compliant and keep your trucks on the road with All Smog Motors. We specialize in CARB emissions compliance checks for heavy-duty trucks, making the process simple, fast, and stress-free. Whether you’re up against a registration deadline or received a notice to test, our certified team will handle your inspection accurately and efficiently so you can avoid penalties and costly downtime. Fill out the form below to schedule your compliance check today and keep your fleet moving without interruption.

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CARB Certified Smog Check Benefits

What You Actually Get From Staying Compliant

Beyond just checking a box, CARB compliance keeps your truck operating, your registration active, and your business moving without expensive interruptions or penalties.

Your truck stays road-legal in California, which means no enforcement citations during roadside inspections or CHP weigh station checks.

You avoid DMV registration holds that block renewal and effectively ground your vehicle until compliance is restored.

You’re protected from fines ranging from $1,000 to $10,000+ per vehicle per day for operating a non-compliant truck.

You maintain access to ports, freight terminals, and work zones that require proof of CARB compliance before entry.

Your test results are on file with the state, so if you’re ever flagged by roadside sensors, you have documentation.

You meet the twice-yearly testing requirement without pulling your truck off the road for traditional inspections.

Mobile Clean Truck Check in Los Angeles & Riverside

Testing Built for the Trucks That Actually Need It

Not every truck needs this service, and we don’t test every truck. CARB’s Clean Truck Check program strictly applies to heavy-duty diesel and alternative fuel vehicles with a GVWR over 14,000 pounds. If your truck is a model year 2013 or newer, it relies on an onboard diagnostics (OBD) system to monitor emissions in real time. That is our exact specialty.

Older trucks without OBD systems require outdated opacity smoke testing, and lighter passenger vehicles fall under completely different rules. We don’t do smoke tests, and we don’t service cars. We provide fast, digital testing exclusively for the 2013 and newer commercial trucks over 14,000 pounds keeping California’s supply chain moving.

If you operate one of these heavy-duty rigs in Los Angeles or Riverside County, you are currently required to pass emissions testing twice a year. Be aware: starting in October 2027, that mandate jumps to four times per year for OBD-equipped trucks.

The state isn’t loosening its grip. They are tightening enforcement, deploying more roadside sensors, and actively mailing out Notices to Submit to Testing (NST). Getting ahead of your compliance deadlines with a fast, mobile test saves you from scrambling—and keeps your fleet safely out of the DMV’s crosshairs.

Mobile Digital Emissions Testing in Riverside County

How the OBD Testing Process Actually Works

Your heavy-duty truck’s computer already tracks its own emissions data. Every time the engine runs, the ECU monitors critical components like NOx levels, particulate matter, and exhaust gas recirculation. That data is sitting in the system, ready to be pulled.

Here is how our digital emissions testing works in the field:

Direct OBD Connection: We connect CARB-certified diagnostic equipment directly to your truck’s port.
Fast Data Extraction: We download the exact emissions parameters the state requires in just 10–15 minutes.
Instant Electronic Submission: The results are securely uploaded straight to California’s CTC-VIS database for you.

Because we bring the service to your yard or truck stop, there is no need to drop your rig at a shop, leave it overnight, or pull a driver off their route. You don’t lose a single day of revenue to compliance testing.

Once the data is submitted, the state analyzes it to ensure your emissions control systems are functioning properly. If everything checks out, your vehicle is officially CARB compliant.

But what happens if there is an issue? If the diagnostic scan reveals a fault code or an emissions monitor that isn’t ready, you will know exactly what needs attention before your deadline hits. Testing early gives you the critical window needed to make repairs without facing a sudden DMV registration hold or a 30-day Notice to Submit to Testing.

Frequently Asked Questions

What trucks are required to get CARB compliance testing in California?

CARB’s Clean Truck Check program applies to nearly all diesel and alternative fuel heavy-duty vehicles with a gross vehicle weight rating over 14,000 pounds that operate on California public roads. This includes semi-trucks, commercial delivery vehicles, buses, motorhomes, and heavy-duty work trucks. If your truck is model year 2013 or newer, it’s equipped with an onboard diagnostics system and requires digital OBD testing. Older trucks without OBD systems need opacity smoke testing and visual inspections instead. The requirement applies whether your truck is registered in California or out of state—if you’re operating in California, you need to comply. The only exceptions are vehicles that travel less than 1,000 miles per year in California under the low-use exemption, or those that qualify for a temporary 5-day pass.

How often do I need to get my heavy-duty truck tested for CARB compliance?

Most heavy-duty trucks are required to undergo emissions compliance testing twice per year under California’s Clean Truck Check program. For California-registered vehicles, your compliance deadlines are tied to your DMV registration expiration date. Out-of-state vehicles have deadlines based on the last digit of the vehicle identification number. You can submit a passing test up to 90 days before your deadline, which gives you a window to get it done without rushing. Starting in October 2027, OBD-equipped vehicles will be required to test four times per year instead of twice. Agricultural vehicles and California-registered motorhomes used for recreation have annual testing requirements instead of semi-annual. Missing a deadline results in a registration hold from the DMV, which means you can’t renew your registration until you’re compliant.

What happens if my truck fails the CARB emissions test or I miss the deadline?

If your truck fails the emissions test, you’ll receive a detailed report explaining why. Common reasons include fault codes in the emissions control system, the check engine light being on, or OBD readiness monitors not being set. You’ll need to address the issue—whether that’s making repairs, clearing codes, or completing drive cycles to reset monitors—and then retest before your compliance deadline. If you miss your deadline entirely without submitting a passing test, the California DMV will place a registration hold on your vehicle. This means you cannot renew your registration until you become compliant. You also risk being flagged by carb’s roadside emissions monitoring devices, which can trigger a Notice to Submit to Testing. Once you receive that notice, you have 30 days to submit a passing test or face fines and potential enforcement action. Non-compliance can also result in being denied access to ports, freight terminals, and certain work zones that require carb compliance.

Can I get CARB testing done if my truck is registered out of state?

Yes. All heavy-duty trucks operating in California must comply with CARB regulations, regardless of where they’re registered. If you’re an out-of-state carrier running loads into or through California, your truck still needs to meet Clean Truck Check requirements. Your compliance deadlines are based on the last digit of your vehicle’s VIN rather than a registration renewal date. You’ll need to register your truck in California’s CTC-VIS database, pay the annual compliance fee, and submit passing emissions tests twice per year. If you only operate in California for short periods, carb does offer a 5-day pass once per calendar year, but you must submit the request at least 7 business days before entering the state. For regular operations, it’s simpler to stay compliant year-round rather than trying to time your California trips around testing windows.

What's the difference between OBD testing and traditional smog testing for trucks?

OBD testing is the digital method used for 2013 or newer heavy-duty trucks equipped with onboard diagnostics systems. Instead of measuring exhaust smoke or running the truck through physical tests, we connect to the truck’s computer and download emissions data that the ECU has already been collecting. This data shows whether the emissions control systems are functioning properly and whether there are any fault codes or readiness issues. The whole process takes just a few minutes and doesn’t require taking the truck out of service. Traditional smog testing—called opacity testing for heavy-duty vehicles—is used for older trucks (2012 and earlier) that don’t have OBD systems. This involves measuring the darkness of the exhaust smoke using specialized equipment and performing a visual inspection of emissions control components. Both methods are valid, but they apply to different truck model years. carb requires the appropriate test based on your engine model year, not the truck’s model year, so always check your emissions control label to be sure.

How much does it cost if I don't stay CARB compliant in California?

The financial consequences of non-compliance add up fast. First, there’s the annual compliance fee of around $31 per vehicle just to participate in the program—that’s unavoidable. If you operate without complying, you’re looking at fines that range from $1,000 to $10,000 per vehicle per day depending on the severity of the violation. carb collected over $21 million in penalties in 2022 alone, so enforcement is real and active. Beyond fines, a DMV registration hold means your truck can’t legally operate, which translates to lost revenue for every day it sits. If you’re an owner-operator running one truck, that could be thousands of dollars in missed loads. Fleet operators face multiplied costs across multiple vehicles. California shippers and receivers who hire non-compliant carriers can also be fined up to $10,000 per year, which means some companies won’t even load your truck if you can’t prove compliance. Add in potential towing fees, inspection citations, and denied access to ports or terminals, and the cost of staying compliant is a fraction of what you’d pay for ignoring it.

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