Hear from Our Customers
If you’re running 2013 or newer heavy-duty trucks in California, you already know the state isn’t playing around with compliance anymore. Starting this year, CARB requires emissions testing every six months for diesel and alternative fuel trucks over 14,000 pounds GVWR. Miss your deadline and the DMV won’t let you renew your registration. Your truck sits. Your business stops.
But it’s not just about registration. Freight facilities, cargo ports, and rail yards around Los Angeles are now checking for Clean Truck Check compliance before they let you through the gate. No certificate means no entry, and they’re required to report non-compliant vehicles directly to CARB.
You need testing done by someone with the right credentials, the right equipment, and the ability to submit results directly into the state’s CTC-VIS system. That’s what keeps your trucks on the road and your business moving without interruption.
We serve the Walnut Park area with CARB certified emissions testing for heavy-duty vehicles. Our testers completed the required HD I/M training course, passed the state examination, and hold active CARB Authorized Tester Certification. That means we’re legally qualified to test your trucks and submit results that actually count.
We use CARB certified OBD testing devices and follow the exact protocols the state requires. When we finish your test, the results go straight into the CTC-VIS database so your compliance status updates immediately. No paperwork delays. No wondering if it went through.
Walnut Park sits in the heart of Los Angeles County’s trucking corridor, where thousands of owner-operators and small fleets are navigating these new requirements for the first time. We’re here because this community needs reliable, local access to compliance testing without driving across the county or waiting weeks for an appointment.
First, we verify your truck qualifies for the service. You need a model year 2013 or newer diesel or alternative fuel vehicle with a gross vehicle weight rating over 14,000 pounds. If your truck is older than 2013 or lighter than 14,000 pounds, this testing doesn’t apply to your vehicle.
Once we confirm eligibility, we connect our CARB certified OBD diagnostic equipment to your truck’s onboard system. The test pulls emissions data directly from your vehicle’s computer and checks it against California’s standards. This isn’t a visual inspection or a tailpipe test. It’s a digital scan of your truck’s emissions control systems.
If your truck passes, we submit the results to CARB’s CTC-VIS system right away. You’ll receive proof of compliance that satisfies DMV registration requirements and gets you access to ports and freight facilities. The whole process typically takes under an hour if there are no issues.
If your truck doesn’t pass, we’ll explain what the system flagged and what needs repair. You can get the work done wherever you choose, then come back for a retest. CARB allows you to submit test results up to 90 days before your compliance deadline, so there’s time to handle repairs without missing your window.
Ready to get started?
California’s Clean Truck Check program mandates testing every six months starting in 2025 for all applicable heavy-duty vehicles. That frequency increases to quarterly testing beginning in October 2027. You’re also required to pay an annual compliance fee, which is $31.18 per vehicle for 2025.
The testing applies specifically to diesel and alternative fuel trucks that are model year 2013 or newer with a GVWR over 14,000 pounds. These are the vehicles equipped with onboard diagnostic systems that CARB can monitor electronically. Older trucks and lighter vehicles follow different rules and aren’t part of this program.
If you operate in the Los Angeles area, compliance isn’t optional. The ports won’t let you in without it. The DMV won’t renew your registration without it. And CARB has enforcement authority to issue penalties for non-compliance that run into the thousands of dollars per violation.
This is especially relevant for the trucking community in Walnut Park and surrounding areas, where many owner-operators and small fleets depend on port access for their livelihood. One missed test can mean lost contracts, delayed shipments, and revenue you can’t recover. The cost of staying compliant is a fraction of what you’d lose by letting it slide.
It’s mandatory, not optional. If you own or operate a diesel or alternative fuel truck that’s model year 2013 or newer with a GVWR over 14,000 pounds, California law requires you to complete emissions testing every six months starting in 2025. This is part of the state’s Clean Truck Check program, and there’s no exemption for small fleets or independent owner-operators.
If you don’t comply, the DMV will block your vehicle registration. That means you can’t legally operate the truck on California roads until you complete the required testing and submit proof of compliance. Freight facilities and ports also check for compliance certification before allowing entry, and they’re required to report non-compliant vehicles to CARB.
The penalties for non-compliance can reach thousands of dollars per violation, and repeated violations can result in additional enforcement action. The state built this program with teeth because they’re serious about reducing diesel emissions from heavy-duty vehicles. Testing isn’t something you can skip or delay without real consequences to your business.
Right now, you need testing every six months. That’s the current requirement that went into effect in 2025 for all diesel and alternative fuel trucks that are model year 2013 or newer with a GVWR over 14,000 pounds. Mark your calendar for every six months from your last test date, because missing your window triggers DMV registration issues.
Starting in October 2027, the frequency increases to quarterly testing. That means every three months instead of every six. CARB is phasing in stricter monitoring over time, so the requirements you’re dealing with now will get tighter in a couple of years.
You can submit test results up to 90 days before your compliance deadline, which gives you some flexibility for scheduling. If you’re running multiple trucks, stagger your testing dates so you’re not trying to get your whole fleet done at once. And if a truck fails, that 90-day window gives you time to make repairs and retest before you’re officially non-compliant.
If your truck fails, you’ll get a detailed report showing which emissions control systems didn’t meet California’s standards. The OBD test checks your vehicle’s onboard diagnostics for issues with the diesel particulate filter, NOx sensors, exhaust gas recirculation system, and other emissions components. Whatever triggered the failure will be documented in the test results.
You’ll need to get the problem repaired before you can pass a retest. You can take your truck to any qualified diesel mechanic you trust. Once the repairs are done, come back for another test. There’s no limit on how many times you can retest, but you need a passing result submitted to CARB before your compliance deadline or you’ll face registration blocks and potential penalties.
This is why testing early matters. If you wait until the last minute and your truck fails, you might not have time to get repairs done and retest before your deadline. CARB allows you to submit results up to 90 days in advance specifically so you have time to deal with failures without putting your registration at risk. Use that buffer. Don’t wait until you’re up against the deadline.
No. This specific testing program only applies to model year 2013 and newer heavy-duty vehicles. If your truck is model year 2012 or older, it’s not part of the Clean Truck Check program and doesn’t require this type of OBD emissions testing. The cutoff is 2013 because that’s when manufacturers started equipping heavy-duty trucks with the onboard diagnostic systems that CARB can monitor electronically.
Older trucks may still have other emissions requirements depending on their weight class and how they’re used, but they’re not subject to the semi-annual OBD testing that newer trucks need. The same goes for lighter vehicles. If your truck has a GVWR under 14,000 pounds, it doesn’t qualify for this program regardless of model year.
Make sure you know your truck’s exact model year and GVWR before scheduling testing. We verify eligibility before we start because running the wrong test wastes your time and doesn’t satisfy any compliance requirements. If you’re not sure whether your vehicle qualifies, check your registration or call us with your VIN and we can confirm.
If your semi truck is model year 2013 or newer with a GVWR over 14,000 pounds, you need CARB compliance testing through the Clean Truck Check program. This is different from a standard smog check. It’s an OBD-based emissions test that’s specific to heavy-duty diesel and alternative fuel vehicles, and it requires specialized equipment and CARB credentialed testers.
Traditional smog checks that most people think of apply to lighter passenger vehicles and follow different testing protocols. Heavy-duty trucks over 14,000 pounds don’t go through the same smog check process. You need testing that connects directly to your truck’s onboard diagnostic system and submits results to CARB’s CTC-VIS database.
Not every shop that does smog checks can perform CARB compliance testing for heavy-duty vehicles. You need a facility with CARB certified OBD testing equipment and staff who completed the HD I/M training course and hold active tester credentials. That’s what we provide. If you show up at a regular smog check station with a heavy-duty truck, there’s a good chance they can’t help you because they don’t have the right equipment or certification.
Testing costs vary by provider, but you’re also required to pay CARB’s annual compliance fee, which is $31.18 per vehicle for 2025. That fee goes directly to the state and covers the administrative costs of the Clean Truck Check program. It’s separate from whatever the testing facility charges for the actual emissions test.
When you’re comparing prices, make sure you’re comparing the same service. Some places advertise low rates but don’t include the state fee, or they’re not actually equipped to test heavy-duty vehicles over 14,000 pounds. You need a facility with CARB certified OBD equipment and credentialed testers who can submit results directly to the CTC-VIS system. If the price seems too good to be true, verify they’re actually qualified to do the work.
Factor in the cost of non-compliance when you’re thinking about testing. Missing your deadline means DMV registration blocks, potential port access denials, and CARB penalties that start in the thousands. One missed test can cost you more in lost revenue and fines than a year’s worth of compliance testing. This isn’t an expense you can skip. It’s the cost of operating a heavy-duty diesel truck in California, and it’s not going away.
Local Resources
Useful Links
Other Services we provide in Walnut Park
