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You’re running a business with trucks that need to stay on California roads. That means staying current with Clean Truck Check requirements every six months. Miss a test or let your certificate lapse, and you’re looking at DMV registration holds that ground your equipment. Fines start at $1,000 per day and can hit $75,000 depending on how long you’ve been out of compliance.
We test 2013 and newer heavy-duty diesel trucks in Garnet. You schedule your semi-annual emissions test, we run the OBD diagnostics, and you get documentation that satisfies CARB, the DMV, and any CHP officer who pulls you over. Your trucks stay registered, your drivers stay working, and your business keeps moving.
The testing itself is straightforward if your truck’s emissions systems are functioning. If something’s flagged, you know what needs fixing before it becomes a roadside problem or a compliance violation that costs you days of revenue.
We serve commercial truck operators in Garnet and throughout Riverside County. We’re set up specifically for the heavy-duty vehicle compliance testing that California requires for trucks over 14,000 pounds GVWR.
Garnet sits along major freight corridors, which means you’re dealing with tight delivery windows and equipment that can’t afford to sit idle. We know that. Our testing process is designed to get your compliance certificate processed efficiently so your trucks get back to work.
We handle the CARB diesel compliance requirements for model year 2013 and newer trucks. That’s our lane, and we stay current on the regulatory changes so you don’t have to track every CARB update yourself.
You bring your 2013 or newer heavy-duty truck to our Garnet location. We’re testing trucks with a gross vehicle weight rating over 14,000 pounds—that’s the threshold California set for Clean Truck Check requirements.
The test uses your truck’s onboard diagnostics system. We connect to the OBD port and pull emissions data directly from your engine’s computer. We’re checking that your diesel particulate filter, selective catalytic reduction system, and other emissions controls are working as designed. The test also verifies there are no active fault codes that would indicate a malfunction.
If everything checks out, you get your Clean Truck Check certificate on the spot. That certificate is what you’ll need for DMV registration renewal and what you’ll show if you’re stopped at a CHP inspection. It’s valid for six months, which is your compliance window before the next required test.
If the system flags an issue, we’ll tell you exactly what the diagnostic codes indicate. You’ll need to get those repairs done and come back for a retest before you can get your certificate. It’s better to find out here than during a roadside inspection where the penalty is immediate.
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California’s Clean Truck Check program applies to heavy-duty diesel trucks with 2013 or newer engines and a GVWR above 14,000 pounds. If your truck meets those specs and operates on California roads, you’re required to test every six months. Starting in October 2027, that frequency increases to quarterly for OBD-equipped vehicles.
The compliance fee for 2025 is $31.18 per test. That’s separate from our testing service—it goes directly to CARB. You’re paying for the regulatory program that tracks compliance statewide and flags non-compliant vehicles in the DMV system.
In Garnet and across Riverside County, you’re seeing more enforcement at weigh stations and during routine traffic stops. CHP officers are checking for current Clean Truck Check certificates. If you can’t produce one, or if your certificate is expired, your truck can be red-tagged and taken out of service immediately. That’s lost revenue, potential towing costs, and the scramble to get compliant before you can operate again.
Out-of-state trucks aren’t exempt. If you’re running loads into California, you’re subject to the same semi-annual testing requirements as in-state operators. The regulation applies to your truck the moment it crosses the state line, and enforcement doesn’t make exceptions for out-of-state registration.
Your truck needs Clean Truck Check testing if it has a model year 2013 or newer engine and a gross vehicle weight rating over 14,000 pounds. That includes semi trucks, heavy-duty pickups used commercially, box trucks, and other diesel vehicles above that weight threshold.
The model year matters because 2013 was when EPA emissions standards changed and required more advanced emissions control systems. CARB built their testing program around those OBD-equipped engines. Older trucks have different compliance requirements under separate CARB regulations.
If you’re not sure whether your truck qualifies, check the GVWR on the door placard and your engine’s model year. Both criteria have to be met. A 2015 truck under 14,000 pounds doesn’t require Clean Truck Check testing. A 2010 truck over 14,000 pounds also doesn’t fall under this specific program, though it may have other CARB requirements.
Right now, you need testing every six months. That’s the semi-annual requirement California put in place for all qualifying heavy-duty trucks. Your certificate shows your test date and expiration date—that six-month window is your compliance period.
Starting in October 2027, the frequency increases to quarterly for trucks with onboard diagnostics systems. That means you’ll be testing four times per year instead of twice. CARB is phasing that in to catch emissions problems faster and reduce the amount of time non-compliant trucks operate on California roads.
You can test early if your schedule makes that easier. If your certificate expires in March but you’re near a testing location in February, you can knock it out ahead of time. The new six-month period starts from your test date, not from when the old certificate expired. Just don’t let it lapse—an expired certificate triggers a DMV registration hold, and you can’t renew your registration until you’re compliant again.
If your truck fails, you’ll get a diagnostic report showing which emissions system triggered the failure. Common issues include DPF regeneration problems, SCR system malfunctions, or active fault codes that indicate a sensor or component isn’t working correctly.
You’ll need to get those repairs done at a qualified diesel shop. Once the work is complete and the fault codes are cleared, you come back for a retest. You can’t get your Clean Truck Check certificate until your truck passes, and you can’t legally operate it on California roads without that certificate.
Some operators try to run with an expired or failed test, hoping they won’t get caught. That’s a bad bet. CHP is actively checking compliance at weigh stations and during traffic stops. If you’re flagged as non-compliant, your truck gets red-tagged on the spot. You’re paying for a tow, you’re losing the day’s revenue, and you’re still facing the same repairs plus potential fines that start at $1,000 per day.
Yes. If your truck operates in California, you’re subject to Clean Truck Check requirements regardless of where it’s registered. The regulation applies to any heavy-duty diesel truck with a 2013+ engine and GVWR over 14,000 pounds that uses California roads.
CARB doesn’t distinguish between in-state and out-of-state operators for this program. You need the same semi-annual testing and the same valid certificate. Enforcement happens at the border, at weigh stations, and during roadside inspections throughout the state.
Some out-of-state carriers assume they’re exempt or that California won’t track their compliance. That’s not how it works. CARB maintains a database of all trucks operating in the state, and non-compliant vehicles get flagged. If you’re running regular routes into California, you need to build Clean Truck Check testing into your compliance schedule just like your in-state competitors do.
The state compliance fee for 2025 is $31.18 per test. That’s the fee CARB charges to fund the Clean Truck Check program—it goes directly to the state, not to the testing facility. Our testing service fee is separate and covers the actual diagnostic work and certificate processing.
Compare that to the cost of non-compliance. Fines range from $1,000 to $75,000 per day depending on the violation and how long you’ve been out of compliance. A DMV registration hold means your truck sits idle until you get tested and pass. If you’re caught operating without a valid certificate, you’re looking at roadside enforcement that red-tags your vehicle immediately.
The math is straightforward. Testing twice a year costs you a few hundred dollars total. One day of downtime from a compliance violation costs you that plus lost revenue, potential towing, and the scramble to get compliant under pressure. The testing is cheap insurance against much bigger problems.
We can usually accommodate same-day testing if you call ahead and we have availability. The test itself doesn’t take long—we’re pulling data from your truck’s OBD system and processing the results. If your emissions systems are functioning properly, you can get your certificate the same visit.
The bottleneck is usually scheduling, not the test duration. We’re testing heavy-duty trucks that can’t just pull into any service bay, and we need to manage the flow to keep wait times reasonable for everyone. Calling ahead lets us slot you in and gives you a realistic timeframe.
If you’re up against a registration deadline or you need to get a truck back on the road fast, let us know when you call. We’ll work with you to get it done as quickly as possible. Just understand that if your truck fails the test, you’re not getting a certificate until the repairs are done and you pass a retest. There’s no shortcut around that—the system either shows compliant emissions or it doesn’t.
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