If you operate a semi-truck or commercial fleet in California, passing the Clean Truck Check (Heavy-Duty Inspection and Maintenance – HD I/M) program is required by law. At All SMOG Motors, we specialize exclusively in commercial emissions compliance—we do not service passenger cars or perform general auto repairs.
Clean Truck Check testing is required every six months. California-registered trucks follow DMV renewal dates, while out-of-state vehicles follow a VIN-based schedule. You can submit your test up to 90 days early to stay compliant and avoid penalties.
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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.
What Passing This Test Does for You
This isn't about checking a box. It's about keeping your truck legal, your registration active, and your business moving without interruption from the state.
Does Your Vehicle Qualify for CARB Clean Truck Check?
To save you time, let’s be clear about exactly what we test. At All SMOG Motors, we specialize in digital Clean Truck Check emissions testing for commercial trucks and fleets. We do not service passenger cars, perform general truck repairs, or provide opacity smoke testing for older engines.
Do not assume you are exempt just because your truck is registered outside California. If your commercial vehicle operates on public roads in California and falls under the Clean Truck Check program, you may still be required to report the vehicle, pay the annual compliance fee, and submit passing emissions test results through CTC-VIS.
Clean Truck Check testing is currently required twice per year for most subject vehicles. CARB is scheduled to move to quarterly testing, meaning four tests per year, beginning in 2027. Staying ahead of your assigned deadlines is important if you want to avoid penalties, compliance issues, or DMV registration holds.
How the OBD Testing Process Actually Works
When it’s time for your Clean Truck Check, you do not need to waste hours sitting at a repair shop. All SMOG Motors provides mobile OBD emissions testing for commercial trucks and fleets, traveling directly to your fleet yard, truck stop, or vehicle location. Our testing process is fast—typically completed in just 10 to 15 minutes—and relies on hard data pulled straight from your truck’s computer.
If your Malfunction Indicator Light is on, if your truck has active or permanent emissions-related codes, or if readiness monitors are not set because codes were recently cleared, your truck may not pass the Clean Truck Check. If this happens, we will explain which codes or readiness issues caused the failure.
Please note that All SMOG Motors strictly provides compliance testing and does not perform automotive or truck repairs. You will need to have a qualified mechanic repair the underlying issue before retesting.
Passing Clean Truck Check results may be submitted up to 90 days before your compliance deadline. We recommend testing early so you have time to handle any repairs, retest if needed, and avoid expensive fines, compliance issues, or DMV registration holds.
Frequently Asked Questions
Any diesel or alternative-fuel heavy-duty vehicle operating on California public roads with a Gross Vehicle Weight Rating (GVWR) over 14,000 pounds 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 if they operate in California.
At All SMOG Motors, we focus specifically on mobile digital OBD testing for commercial trucks and fleets:
In addition to passing your emissions test, vehicle owners must report vehicles in CARB’s CTC-VIS system, pay the annual compliance fee, and submit passing Clean Truck Check results by the assigned deadline. Most subject vehicles currently test twice per year, while OBD-equipped vehicles are scheduled to move to quarterly testing beginning in October 2027.
For most subject heavy-duty trucks operating in California, passing Clean Truck Check results must be submitted twice per year through semi-annual testing. Your specific deadlines are determined by your vehicle’s registration status:
90-Day Testing Window: You can submit your passing test results up to 90 days before your official deadline. We recommend scheduling your mobile inspection early to avoid last-minute stress. All SMOG Motors provides fast, 10–15 minute testing directly at your yard or truck stop in Los Angeles and Riverside counties to help your fleet stay compliant and reduce the risk of registration holds.
The best way to stay on top of your schedule is to monitor your deadlines in your official CTC-VIS account. Tracking these dates helps ensure you are not caught off guard by upcoming compliance requirements or potential penalties.
ntial penalties.If your truck fails the Clean Truck Check OBD test, it means the vehicle may not be compliant with California’s heavy-duty emissions requirements. A failed test can prevent you from obtaining a compliance certificate and may lead to DMV registration holds, penalties, or compliance delays.
Common reasons for failure include:
Important Note on Repairs: All SMOG Motors strictly provides mobile emissions testing and does not perform mechanical repairs. If your truck fails, we will provide the specific diagnostic codes so your fleet mechanic or a qualified repair shop can fix the underlying issue.
The state allows you to submit a passing test up to 90 days before your deadline. We strongly recommend scheduling your mobile inspection early in Los Angeles and Riverside counties so you have a buffer for repairs and retesting without risking costly downtime, compliance issues, or registration penalties.</p
No. If your heavy-duty vehicle is subject to the CARB Clean Truck Check program, operating without compliance on California public roads can create serious legal, financial, and operational problems. Staying compliant is not optional for covered vehicles—it is part of doing business in California.
Fast Mobile Compliance Support: At All SMOG Motors, we help truck owners and fleet operators stay ahead of these issues with fast mobile OBD testing. Our certified technicians travel directly to your yard, truck stop, or vehicle location across Los Angeles and Riverside counties, with most inspections completed in about 10–15 minutes.
If you received a Notice to Submit to Testing, have an upcoming deadline, or are dealing with a registration issue, we can provide emergency compliance support and submit passing test results through CARB’s CTC-VIS system once your vehicle passes.
We also offer a 5–10% military discount for active-duty members and veterans.
The total cost of compliance is split between the state-mandated CARB compliance fee and the cost of the emissions inspection. At All SMOG Motors, we provide transparent pricing for mobile Clean Truck Check testing throughout Los Angeles and Riverside counties. Contact us for current rates on individual inspections or fleet-wide testing.
Testing-Only Advantage: Because we specialize strictly in compliance testing and do not perform mechanical repairs, you receive a focused, independent assessment of your truck’s emissions status. We have no incentive to sell you parts or repair labor.
Avoid Compliance Problems: While testing and fees are a cost of doing business, they are typically much cheaper than the alternative. Non-compliance can lead to DMV registration holds, penalties, costly downtime, and lost revenue if your truck cannot stay on the road.
For a custom quote on individual inspections or fleet-wide mobile testing in Los Angeles and Riverside counties, contact All SMOG Motors today.
Once your truck passes the Clean Truck Check OBD test, All SMOG Motors handles the electronic submission of your results directly to CARB’s CTC-VIS database. You do not need to mail paperwork, upload files, or contact the state yourself. However, there are a few final steps to make sure your compliance record is complete:
Planning for the Future: After you pass, you are generally set until your next semi-annual deadline six months later. Your 90-day testing window opens three months before your next due date, so scheduling early gives you time to address any unexpected issues before your deadline.
All SMOG Motors helps recurring clients in Los Angeles and Riverside counties plan ahead for upcoming testing windows with fast, mobile OBD testing at your yard, truck stop, or vehicle location.
Be sure to keep your contact information updated in the CTC-VIS system so you receive official state notifications regarding your account and upcoming testing requirements.
