Hear from Our Customers
Your truck can’t legally operate on California roads without passing Clean Truck Check testing. That’s not a suggestion—it’s state law as of October 2024.
If you’re running a 2013 or newer diesel truck with a GVWR over 14,000 pounds, you’re required to get CARB emissions testing done semi-annually starting January 2025. Miss it, and you’re looking at fines up to $10,000 per vehicle, per day. The DMV will block your registration. CHP and CARB can cite you during roadside inspections.
We handle CARB diesel compliance testing for heavy-duty vehicles right here in La Cañada Flintridge. You bring your truck in, we run the OBD emissions test, and you get documentation proving you’re California CARB compliant. No surprises, no runarounds—just the testing you need to keep operating legally.
This matters because your business depends on those trucks being on the road, not sitting idle while you sort out compliance issues. We make sure you’re covered before deadlines hit.
All SMOG Motors serves truck operators throughout La Cañada Flintridge and the surrounding areas who need reliable CARB emissions testing. We’re CARB-certified to perform Clean Truck Check testing on 2013 and newer diesel vehicles.
La Cañada Flintridge sits right at the 210 and 2 freeway junction, which means plenty of commercial traffic moves through here daily. We understand that truck operators in this area are dealing with California’s toughest compliance requirements in the country—and we’re set up to help you meet them without the hassle.
You’re not getting a generic smog shop trying to figure out heavy-duty regulations. You’re working with a facility that specializes in CARB HD I/M testing for the exact vehicles that fall under these new rules.
First, we verify your truck qualifies—2013 or newer diesel engine with GVWR over 14,000 pounds. If it doesn’t meet those specs, this testing doesn’t apply to your vehicle.
Once confirmed, we connect to your truck’s onboard diagnostics system. That’s the OBD test CARB requires for newer diesel trucks. We’re checking emissions data directly from your engine’s computer—no tailpipe test, no smoke reading. It’s all electronic.
The test takes about 20 to 30 minutes in most cases. If your truck passes, we submit the results directly to CARB, and you get your compliance documentation. You can submit passing results up to 90 days before your deadline, so you’re not scrambling at the last minute.
If there’s an issue, we’ll tell you exactly what flagged and what needs attention. You’ll know what you’re dealing with before you leave. No vague “check engine” nonsense—you get clear information so you can make decisions about repairs.
Ready to get started?
California’s Clean Truck Check program started October 2024, with the first compliance deadlines hitting January 2025. If you operate a semi truck or any heavy-duty diesel vehicle from 2013 or newer, you’re required to test twice a year right now. Starting October 2027, that increases to four times annually.
You also pay an annual compliance fee—$32.13 as of 2026—and your vehicle has to be reported in CARB’s system. All of this is on top of regular maintenance and operating costs, which is why getting testing done correctly the first time matters.
Here in La Cañada Flintridge, many operators are running trucks through the 210 corridor or serving businesses in the Foothill Communities. You’re already dealing with California’s high fuel costs and tight regulations. The last thing you need is a compliance violation adding thousands in fines on top of everything else.
We make sure your CARB emissions testing is done right so you stay legal and keep your trucks working. That’s the whole point—compliance without the drama.
Only diesel trucks that are model year 2013 or newer and have a gross vehicle weight rating over 14,000 pounds. If your truck is older than 2013 or weighs less than 14,000 pounds GVWR, this program doesn’t apply to you.
The 2013 cutoff matters because that’s when manufacturers started equipping diesel engines with onboard diagnostics systems that CARB can test electronically. Older trucks don’t have the OBD systems this testing requires, so they’re not part of the program.
This includes semi trucks, heavy-duty pickups used commercially, box trucks, and diesel motorhomes that meet the weight and year requirements. If you’re not sure whether your vehicle qualifies, bring your registration—we can tell you in about 30 seconds whether you need this testing or not.
Right now, you’re required to test twice a year—that’s semi-annual testing. Your specific deadlines depend on when your vehicle was registered in the CARB system, but most operators are looking at testing every six months starting in 2025.
In October 2027, the requirement increases to four times per year. That’s quarterly testing, which means more frequent visits and tighter scheduling to stay compliant.
You can submit passing test results up to 90 days before your deadline, which gives you some flexibility. If you know your deadline is coming up in March, you can test in December and already have it handled. That’s especially useful if you’re planning to be on the road or out of state when your deadline hits.
If your truck fails, you’ll get a report showing exactly what triggered the failure—usually it’s a fault code in the OBD system or an emissions-related component that’s not functioning properly. You’ll need to get those issues repaired before you can retest.
Once repairs are done, you come back for another test. If it passes, we submit the results to CARB and you’re compliant. If it fails again, you’ll need to address whatever’s still flagged.
Here’s the important part: you can’t legally operate that truck on California roads until it passes and you have proof of compliance. CARB and CHP can pull you over during roadside inspections, and if you’re not compliant, you’re getting cited. Fines start at $10,000 per vehicle, per day, and the DMV will block your registration if you’re a California-registered vehicle. It’s not worth the risk—get it fixed and get it tested.
Yes, if you’re operating in California. The Clean Truck Check requirement applies to any qualifying truck operating on California public roads, regardless of where it’s registered. Out-of-state trucks are not exempt.
If your truck is registered in Nevada, Arizona, Oregon, or anywhere else, but you’re running loads through California, you still need to comply with CARB emissions testing. That means getting tested and paying the annual compliance fee.
CARB and CHP enforce this during roadside inspections, and they’re not making exceptions for out-of-state plates. If you’re caught operating without compliance, you’re facing the same penalties as California-registered operators—up to $10,000 per vehicle, per day. If you regularly run routes through California, it’s worth getting tested and staying legal.
Testing typically takes 20 to 30 minutes once we’ve got your truck connected to the diagnostic equipment. It’s not an all-day affair—most operators are in and out pretty quickly.
Cost varies depending on the facility, but you’re also paying an annual CARB compliance fee of $32.13 as of 2026. That fee goes to the state, not the testing facility, and it’s required whether you test once or four times a year.
The real cost you should be thinking about is what happens if you don’t test. A single day of non-compliance can cost you $10,000 in fines. If you’re running multiple trucks and they’re all out of compliance, that’s $10,000 per vehicle, per day. Suddenly a $30 fee and 30 minutes of your time sounds pretty reasonable compared to five-figure penalties and losing your registration.
You need to go to a CARB-certified testing facility with credentialed testers. Not every smog shop is set up to handle heavy-duty diesel emissions testing—this is a specialized program that requires specific equipment and certification.
CARB maintains a list of certified facilities, and All SMOG Motors is certified to perform Clean Truck Check testing for 2013 and newer diesel trucks. We’ve got the equipment, the credentials, and the experience with OBD testing for heavy-duty vehicles.
Don’t assume your regular mechanic or the corner smog shop can handle this. If they’re not CARB-certified for Clean Truck Check, the test won’t count, and you’ll still be out of compliance. Make sure you’re going to a facility that’s actually authorized to perform this testing before you waste time and money.
Local Resources
Useful Links
Other Services we provide in La Cañada Flintridge
