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Your truck clears the test, we submit the results directly to CARB, and your DMV registration hold gets lifted. That’s it.
You’re not scrambling to figure out why your renewal got blocked. You’re not losing days of revenue because a truck is grounded. And you’re definitely not staring down a $10,000-per-day fine for non-compliance.
If you’re running 2013 or newer diesel trucks over 14,000 pounds in California, Clean Truck Check testing isn’t optional. It’s required every six months. Miss your deadline and the state puts a hold on your registration until you comply. We make sure that doesn’t happen.
You get tested within the 90-day window before your deadline. If something needs fixing, you’ve got time. If you pass, you’re done and documented.
We focus on CARB compliance for the trucks that need it most—2013 and newer heavy-duty vehicles operating in California. We’re not trying to be everything to everyone.
We’re located in Glendora, serving fleets and owner-operators across the San Gabriel Valley. If you’re hauling freight through LA, moving goods to the ports, or running routes that touch California, you know the rules here are different. Stricter. More expensive to ignore.
We use CARB-certified OBD testing equipment. Our results go straight into the state system. You get your compliance certificate, your registration hold clears, and you move on.
You bring your truck in during the 90-day window before your compliance deadline. That deadline is based on your vehicle’s last eight digits of the VIN—CARB sets it, not us.
We connect to your truck’s onboard diagnostics system using certified equipment. The OBD system reports emissions data directly from the engine. We’re not doing a tailpipe test—this is about what your truck’s computer says is happening under the hood.
If your truck passes, we submit the results to CARB electronically. Usually within a day or two, your record updates and any DMV registration hold gets removed. You’ll get a certificate of compliance for your records.
If your truck doesn’t pass, you’ll know exactly what triggered the failure. You get it repaired, then come back for a retest. That’s why testing early in your 90-day window matters—it buys you time to fix issues without missing your deadline.
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California’s Clean Truck Check program applies to nearly every diesel and alternative fuel truck over 14,000 pounds GVWR operating in the state. If your truck is model year 2013 or newer, it requires OBD-based emissions testing every six months.
This isn’t the same as a regular smog check. Your truck’s onboard diagnostics system has to communicate properly with CARB’s testing equipment. The system checks for emission control malfunctions, readiness monitors, and fault codes.
Here in Glendora and across the San Gabriel Valley, we see a lot of trucks moving between freight yards, distribution centers, and the ports. If your truck isn’t compliant, you can’t legally operate in California. You’ll face registration holds at minimum. Enforcement is real—CARB uses roadside monitoring and license plate readers to catch high-emitting vehicles.
Starting in 2027, the testing frequency increases to quarterly for OBD-equipped trucks. Right now, you’ve got a six-month cycle. But the rules are tightening, and the penalties for non-compliance are steep. Up to $10,000 per vehicle per day if you’re caught operating without a valid test.
Yes, if you operate in California. The Clean Truck Check requirement applies to any heavy-duty truck over 14,000 pounds GVWR that operates in the state, regardless of where it’s registered.
Out-of-state trucks aren’t exempt. If you’re hauling freight into California, running routes through the state, or accessing ports and freight facilities here, your truck needs to comply with CARB emissions testing.
California uses roadside monitoring and automated license plate readers to identify non-compliant vehicles. Getting caught without a valid test can result in fines and being barred from operating until you comply. If you’re running California routes regularly, it’s worth getting tested here in Glendora before you have an issue on the road.
You’ll get a detailed report showing exactly what caused the failure—usually a fault code, a malfunctioning emissions control component, or readiness monitors that aren’t set. That gives you a clear direction for repairs.
You’ll need to take your truck to a qualified diesel mechanic to fix whatever triggered the failure. Once repairs are done, you come back for a retest. There’s no penalty for failing the test itself—the penalty comes if you miss your compliance deadline entirely.
That’s why we recommend testing early in your 90-day window. If you wait until the last week and fail, you’re in a tough spot. Test early, and you’ve got time to handle repairs without risking a registration hold or operating violations.
Your compliance deadline is assigned by CARB based on the last eight digits of your truck’s VIN. It’s not tied to your registration renewal date—it’s a separate six-month cycle specific to emissions testing.
You can check your deadline on CARB’s Clean Truck Check website by entering your VIN. You’re allowed to test up to 90 days before that deadline. Testing earlier doesn’t move your next deadline up—it just gives you a buffer in case something needs attention.
If you’ve never tested before, or if you’re bringing an out-of-state truck into California operation, you’ll need to get into the system. Once you’re in, CARB tracks your compliance and will flag your registration if you miss a deadline.
Trucks model year 2013 and newer are equipped with advanced onboard diagnostics systems that monitor emissions controls in real time. CARB’s Clean Truck Check program uses OBD testing to pull data directly from your truck’s computer.
Older trucks use different testing methods—or in some cases, aren’t subject to the same Clean Truck Check requirements. But if your truck is 2013 or newer and over 14,000 pounds GVWR, the OBD test is mandatory.
The OBD system tracks things like diesel particulate filter performance, NOx sensor function, and emission control readiness. It’s more comprehensive than older testing methods, and it’s harder to pass if your truck has underlying issues. That’s the trade-off with newer emissions technology—it’s cleaner, but it requires proper maintenance and monitoring.
You can get tested at any CARB-certified Clean Truck Check location in California. The results get submitted electronically to the state system regardless of where you test.
That said, if you’re based in or frequently run through the San Gabriel Valley, testing locally in Glendora saves you time. You’re not detouring out of your route or coordinating testing around a long haul.
We see a lot of fleets and owner-operators who operate between LA, the Inland Empire, and the ports. Testing here keeps you close to your operating area and makes it easier to handle retests if needed. Once your results are in the system, your compliance status updates statewide.
If you miss your Clean Truck Check deadline, the DMV will place a registration hold on your vehicle. You won’t be able to renew your registration until you get tested and submit a passing result.
If you continue operating a non-compliant truck in California, you’re looking at penalties up to $10,000 per vehicle per day. CARB enforces this through roadside inspections, automated monitoring, and license plate reader systems.
For fleets, the costs add up fast. For owner-operators, a single violation can be financially devastating. Beyond the fines, you risk losing access to freight contracts and port facilities that require CARB compliance. The testing itself costs a fraction of what you’d pay in penalties—and it keeps your trucks working instead of sidelined.
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