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You already know what happens when a truck falls out of compliance. Registration gets frozen. Fines start piling up daily—sometimes $1,000, sometimes $10,000 per vehicle. Your truck sits instead of earning.
CARB’s Clean Truck Check program went live January 1, 2025, and it applies to every diesel truck with a GVWR over 14,000 pounds that’s model year 2013 or newer. That means if you’re operating in California, you need to submit passing emissions tests twice a year. Miss a deadline or fail a test, and your DMV registration gets put on hold until you fix it.
We handle the OBD testing that CARB requires. The process takes under ten minutes. You get your results submitted directly to the state, and you’re back on the road. No guessing if you’re compliant. No scrambling when enforcement pulls you over.
This isn’t about checking a box. It’s about keeping your business moving without the constant worry that one missed test is going to cost you thousands in penalties or lost work.
We’re based right here in West Puente Valley, serving the trucking community across the San Gabriel Valley. We’re CARB certified and credentialed, which means we’ve completed the state’s tester training and passed the exam required to perform Clean Truck Check inspections.
You’re not dealing with a call center or a statewide chain that doesn’t know your area. You’re working with a local shop that understands the routes you run—whether you’re hauling through La Puente, Hacienda Heights, Rowland Heights, or making long-haul trips through California.
We carry $2 million in liability insurance, which most mobile testers don’t. We’ve been doing this work long enough to know what causes trucks to fail and how to help you avoid it. When you show up, we’re ready to test, submit, and get you cleared fast.
Here’s what happens when you come in for a Clean Truck Check. First, we connect to your truck’s OBD system—that’s the onboard diagnostics port that monitors your emissions control equipment. CARB requires this data to verify that your diesel particulate filter, NOx sensors, and other emissions components are working correctly.
The test itself takes five to ten minutes. We’re pulling diagnostic codes and readiness monitors to confirm everything is functioning within California’s standards. If your truck passes, we submit the results directly to CARB’s database that same day. You’ll receive confirmation, and your compliance status gets updated with the DMV.
If something flags during the test, we’ll tell you exactly what needs attention before you can pass. Most issues are related to check engine lights, incomplete readiness monitors, or faulty emissions sensors. We don’t do the repairs ourselves, but we’ll point you in the right direction so you’re not wasting time or money guessing.
You need to complete this test twice a year for most heavy-duty trucks. CARB will send you a Notice to Submit to Testing, and you’ll have 30 days to get it done. Don’t wait until the last week—if your truck fails, you’ll need time to fix it and retest before the deadline.
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California’s Clean Truck Check program exists because heavy-duty vehicles make up only 3% of vehicles on the road but generate over 50% of nitrogen oxide and diesel particulate pollution. CARB estimates this program covers roughly 1 million trucks and buses operating in the state.
If your truck has a GVWR over 14,000 pounds and the engine is model year 2013 or newer, you’re required to test. Older trucks and lighter vehicles aren’t part of this program—this is specifically for newer diesel engines that use advanced emissions controls like DPF and SCR systems.
You’ll pay an annual compliance fee to CARB, which is currently $31.18 for 2025. That’s separate from the testing fee. The testing itself must be done by a credentialed tester, which is why you can’t just plug in a code reader and call it good.
West Puente Valley sits right in the heart of California’s commercial trucking corridor. If you’re running routes through Los Angeles County or moving freight across the state, you’re going to cross paths with CARB enforcement. They’ve deployed roadside emissions monitoring that flags high emitters, and officers can pull you over to verify compliance on the spot.
Getting tested here means you’re not driving out of your way or losing half a day sitting in line. You’re getting it done locally, and you’re working with someone who knows how CARB enforcement operates in this area.
If your truck fails, you’ll need to address whatever triggered the failure before you can pass and submit a compliant test to CARB. Most failures happen because of active check engine lights, incomplete OBD readiness monitors, or malfunctioning emissions components like diesel particulate filters or NOx sensors.
You’ll get a detailed report showing exactly what caused the failure. From there, you’ll need to take your truck to a repair shop that specializes in heavy-duty diesel emissions systems. Once the repairs are done and the codes clear, you can come back for a retest.
The clock is still ticking on your 30-day deadline from the Notice to Submit to Testing. If you don’t submit a passing test within that window, CARB will place a hold on your DMV registration. That means your truck can’t legally operate in California until you’re compliant. Don’t wait until the last minute to test—if something’s wrong, you need time to fix it.
Most heavy-duty trucks with a GVWR over 14,000 pounds and diesel engines from 2013 or newer need to submit passing Clean Truck Check tests twice a year. CARB calls this semi-annual testing, and it’s required to keep your registration active.
You’ll receive a Notice to Submit to Testing from CARB when it’s time to test. That notice gives you 30 calendar days to complete and submit a passing emissions test. If you miss that deadline, your registration gets flagged and you’ll face penalties that can reach $10,000 per vehicle per day.
RVs and certain agricultural vehicles are exempt from the semi-annual requirement, but if you’re running a commercial truck for freight, delivery, or construction, you’re testing twice a year. Mark your calendar when you get the notice, and don’t let it slide. The fines add up fast, and a registration hold will shut down your operation until you’re compliant.
No. The Clean Truck Check program only applies to diesel trucks with model year 2013 or newer engines. If your truck is older than that, you’re not required to participate in this specific emissions testing program.
CARB designed this program around newer diesel engines because those are the ones equipped with advanced emissions control systems like diesel particulate filters, selective catalytic reduction, and OBD monitoring. Older trucks use different technology and fall under different regulations.
If you’re running a 2012 or older diesel truck in California, you may still have other compliance requirements depending on your GVWR and how the truck is used, but the semi-annual Clean Truck Check testing doesn’t apply to you. This service is specifically for 2013 and newer heavy-duty trucks over 14,000 pounds.
OBD stands for onboard diagnostics. It’s the computer system built into your truck that monitors emissions control components in real time. CARB requires OBD testing because it’s the most accurate way to verify that your diesel particulate filter, NOx sensors, EGR system, and other emissions equipment are functioning correctly.
During a Clean Truck Check, we connect a diagnostic tool to your truck’s OBD port and pull data directly from the engine control module. We’re checking for active fault codes, pending codes, and readiness monitors. If any emissions-related system isn’t working properly, the OBD system will flag it, and your truck won’t pass.
This isn’t a visual inspection or a tailpipe test. CARB wants data straight from your truck’s computer because that’s where emissions failures show up first. If your check engine light is on or your readiness monitors aren’t set, you’re not passing. The system is designed to catch problems before they turn into major pollution issues or costly breakdowns.
Testing fees vary depending on the provider, but you’re typically looking at a service fee for the Clean Truck Check itself, plus the annual CARB compliance fee of $31.18 that goes directly to the state. The testing fee covers the time and equipment needed to connect to your OBD system, run the diagnostics, and submit your results to CARB’s database.
We keep the process straightforward. You’re paying for credentialed testing that meets state requirements and gets submitted same day. No hidden fees, no upsells for services you don’t need.
If your truck fails and needs repairs, that’s a separate cost. We don’t handle the repair work, but we’ll tell you exactly what’s wrong so you’re not paying a shop to guess. Once repairs are done, you’ll need to come back for a retest. Most operators budget for testing twice a year as part of their regular maintenance costs—it’s cheaper than a single day of fines or a registration hold that keeps your truck off the road.
CARB penalties are steep, and they add up fast. Fines range from $1,000 to $75,000 per day depending on the violation. For non-compliance with the Clean Truck Check program, you’re looking at up to $10,000 per vehicle per day. In 2022 alone, CARB collected $21.5 million in penalties from commercial vehicle operators.
Beyond fines, a non-compliant truck will trigger a DMV registration hold. That means your truck is legally prohibited from operating in California until you submit a passing test and clear the hold. You can’t renew your registration, and if you’re caught driving, you’re facing additional penalties on top of the original fines.
CARB also conducts roadside enforcement. Officers can pull over heavy-duty trucks and verify compliance status on the spot. If you’re not current on your testing or you’re operating with a registration hold, your truck gets sidelined immediately. There’s no grace period, no warnings. You’re either compliant or you’re not. The cost of staying compliant is a fraction of what you’ll pay in fines, lost work, and downtime if you let it slide.
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