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You’re looking at $1,000 to $10,000 per vehicle, per day if your trucks aren’t compliant. That’s not a scare tactic—that’s what CARB enforcement actually costs when they flag your registration.
If your semi truck is model year 2013 or newer and weighs over 14,000 pounds, California requires Clean Truck Check emissions testing. Miss your compliance window and the DMV blocks your registration. Your truck can’t legally operate on California roads, regardless of where it’s registered.
We handle CARB emissions testing for heavy-duty diesel trucks in Menifee and across Riverside County. You get a credentialed tester who knows the Clean Truck Check program inside out, a passing test submitted to TRUCRS, and a certificate that keeps your fleet moving. No runaround, no surprises.
Testing happens twice a year for most trucks. If your rig has a 2013 or newer engine, you’ll eventually need testing four times a year starting in 2027. The compliance window opens 90 days before your registration month, so you’ve got time to plan—but not much room to forget.
We serve the trucking industry in Menifee, CA—a city with nearly 700 trucking companies and a logistics corridor that doesn’t stop moving. We’re not trying to upsell you on services your trucks don’t need.
Our testers are CARB-credentialed, meaning they’ve completed the state’s official training and passed the certification exam. We focus exclusively on 2013 and newer heavy-duty trucks because that’s what the Clean Truck Check program covers. If your truck doesn’t meet those specs, we’ll tell you upfront instead of wasting your time.
You’re dealing with a shop that understands the difference between HD I/M testing and standard smog checks. We know what TRUCRS registration looks like, when low-use exemptions apply, and how to keep your compliance records clean without the confusion.
First, we verify your truck qualifies—2013 or newer model year, over 14,000 pounds. If it doesn’t meet those requirements, CARB compliance testing doesn’t apply to your vehicle yet.
Once confirmed, we run the emissions test using CARB-approved equipment. The test checks your diesel particulate filter and measures NOx emissions to make sure your truck meets California’s air quality standards. Most tests take under an hour if your emission system is functioning properly.
After your truck passes, we submit the results directly to the TRUCRS system. You’ll receive a certificate proving compliance, which satisfies the Clean Truck Check requirement for your registration period. That certificate is what keeps the DMV from flagging your registration and blocking your plates.
If your truck doesn’t pass, we’ll explain what failed and what needs repair. California requires a 2010 or newer engine and emission system, so if you’re running older equipment, you’ll need to address that before any test will clear. We don’t do the repairs ourselves, but we’ll point you toward what needs fixing so you’re not guessing.
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Every CARB compliance test includes a full emissions inspection performed by a credentialed tester. We’re checking the systems California actually monitors—your diesel particulate matter output and NOx levels. If your truck’s emission system is intact and working, the test is straightforward.
You also get direct submission to TRUCRS, California’s truck regulation system. That’s the database the DMV checks when your registration comes up. Without a passing test on file, your renewal gets blocked and your truck is flagged for enforcement.
Here in Menifee, CA, most of the fleets we work with are running routes through the Inland Empire and down to the ports. You can’t afford a compliance gap when your trucks are moving freight on tight schedules. We get that, so we don’t drag out the process.
Your compliance certificate is valid for six months in most cases, though trucks with 2013+ engines will eventually move to quarterly testing. That’s not happening until late 2027, but it’s worth planning for now. If you’re managing multiple trucks, we can coordinate testing schedules so you’re not scrambling every registration cycle.
Yes. If your truck operates in California, CARB compliance applies regardless of where it’s registered.
The Clean Truck Check program covers any heavy-duty truck over 14,000 pounds with a 2013 or newer model year that drives on California roads. It doesn’t matter if your plates are from Nevada, Arizona, Texas, or anywhere else. California enforces emissions compliance based on where the truck operates, not where it’s registered.
If you’re an owner-operator or run an out-of-state fleet that moves freight through California, you’re required to register in TRUCRS and complete emissions testing. Enforcement has ramped up significantly since 2023, and trucks without compliance records are getting cited during roadside inspections and weigh station checks.
Most heavy-duty trucks need testing twice a year. Trucks with 2013 or newer engines will eventually require testing four times a year.
Right now, if your truck’s registration renews in January or July, your compliance window is open. Testing must happen within 90 days before your registration month, and the passing results need to be submitted to TRUCRS before your renewal date.
Starting in October 2027, trucks equipped with onboard diagnostics and 2013+ engines will move to quarterly testing. That means four tests per year instead of two. California is phasing this in gradually, but if you’re running newer equipment, plan for the increased frequency. Missing even one test can trigger a registration hold, and that’s not something you can fix quickly once it happens.
You’ll need to repair whatever caused the failure before you can retest and get a passing certificate.
Common failures involve malfunctioning diesel particulate filters, faulty sensors, or emission system components that aren’t working to California’s standards. The test measures NOx and particulate matter, so if those levels are too high or your system isn’t reading correctly, it won’t pass.
We’ll give you a detailed report showing what failed so you know exactly what needs attention. You’ll need to take your truck to a repair shop that handles heavy-duty diesel emission systems. Once repairs are done, you come back for a retest. California doesn’t allow compliance extensions or grace periods, so the clock is ticking from your original compliance deadline. If your registration date passes without a passing test on file, the DMV will block your renewal and your truck is officially non-compliant.
Maybe, but only if your truck genuinely operates under 1,000 miles per year in California.
CARB offers a low-use exemption for trucks that stay below that mileage threshold. You have to report your mileage through TRUCRS and provide documentation proving your truck qualifies. If approved, you’re exempt from testing for that compliance period.
But here’s the catch—if you go even one mile over 1,000 during the year, your exemption is void and you’re immediately out of compliance. CARB audits these exemptions, and if they find you’ve been operating beyond the limit, you’re looking at penalties that start at $1,000 per day, per vehicle. For most commercial operators in Menifee and Riverside County, the mileage threshold is too low to be realistic. If your trucks are running freight routes, moving equipment, or doing anything beyond occasional local trips, you’re better off just doing the testing and staying compliant.
Testing typically costs between $150 and $300 depending on the provider, and the actual test takes about an hour if your truck passes.
Pricing varies based on whether you’re bringing in a single truck or managing a fleet. Some shops offer discounts for multiple vehicles, which makes sense if you’re coordinating testing for several trucks at once. The test itself isn’t complicated if your emission system is working properly—we hook up the diagnostic equipment, run the emissions analysis, and submit the results.
Where things take longer is if your truck fails. Then you’re looking at repair time, which depends entirely on what’s wrong and how quickly you can get parts. After repairs, you’ll need to come back for a retest, which adds more time and cost. The smarter move is to stay on top of your emission system maintenance so you’re not dealing with failures during your compliance window. In Menifee, most of the trucking companies we work with schedule testing early in their 90-day window so they have time to handle any issues before the deadline hits.
CARB compliance testing is specifically for heavy-duty diesel trucks over 14,000 pounds. A regular smog check is for passenger vehicles and lighter trucks.
The equipment is different, the standards are different, and the testers need different credentials. CARB compliance falls under the Heavy-Duty Inspection and Maintenance program, which focuses on diesel particulate matter and NOx emissions from commercial trucks. Regular smog tests measure tailpipe emissions from gasoline engines and lighter diesel vehicles.
If you walk into a standard smog shop with a semi truck, they probably can’t help you. They’re not set up for heavy-duty testing and their testers aren’t CARB-credentialed for the Clean Truck Check program. You need a facility that specifically handles HD I/M testing and knows how to submit results to TRUCRS. That’s what we do at All SMOG Motors—we’re focused on the trucks that actually fall under California’s heavy-duty compliance rules, not passenger cars or light-duty vehicles.
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