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Here’s what happens when your truck isn’t CARB compliant: the DMV puts a hold on your registration. Your truck can’t legally operate on California roads. You’re losing money every day it sits.
That’s not a scare tactic. That’s the reality of California’s Clean Truck Check program for any heavy-duty vehicle over 14,000 pounds with a 2013 or newer diesel engine.
The testing requirement is straightforward. You need a passing emissions test twice a year. The test scans your OBD system and checks that your emissions controls are working. If everything passes, you submit the results to CARB through their CTC-VIS system and pay the $30 annual compliance fee.
If you skip it or fail it, you’re dealing with registration problems, potential fines starting at $1,000, and the headache of getting back into compliance while your business is on pause. West Rancho Dominguez sits right in the heart of the port logistics corridor. Trucks move through here constantly. The last thing you need is a compliance issue keeping you out of the ports or off the road during a tight delivery window.
We focus exclusively on CARB compliance for 2013 and newer heavy-duty diesel trucks. That’s it. We’re not a general smog shop trying to handle every vehicle that rolls in.
This matters because the Clean Truck Check program has specific requirements that don’t apply to older trucks or lighter vehicles. Your 2013+ diesel with OBD needs a different test than a 2010 truck or a passenger car. We know exactly what CARB is looking for in these newer systems.
We’re located in West Rancho Dominguez because this area has one of the highest concentrations of commercial trucking operations in Southern California. You’re minutes from the 710, close to the ports, and surrounded by logistics hubs. When you need compliance testing, you don’t want to drive across the county. You want someone local who understands the urgency and can get you in and out.
The test itself is not complicated. You bring your truck in, and we connect to your OBD system using CARB-certified testing equipment. The scanner pulls data from your engine control module and checks your emissions control systems—things like your diesel particulate filter, your SCR catalyst, and your NOx sensors.
We’re looking for fault codes, system readiness, and whether your emissions equipment is functioning as designed. If your check engine light is on or your OBD system isn’t ready, that’s going to cause a problem. Most tests take about 20 to 30 minutes if everything is working correctly.
Once you pass, we submit your results directly to CARB through the CTC-VIS system. You’ll need to pay the $30 annual compliance fee if you haven’t already. After that, you’re good for the next six months until your next semi-annual test is due.
If something fails, we’ll tell you exactly what the issue is. Sometimes it’s a sensor. Sometimes it’s a regeneration cycle that didn’t complete. Sometimes it’s a bigger problem with your aftertreatment system. Either way, you’ll know what needs to be fixed before you can pass and get back into compliance.
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This service applies to heavy-duty diesel trucks with a gross vehicle weight rating over 14,000 pounds that are model year 2013 or newer and equipped with OBD systems. If your truck doesn’t meet all three of those criteria, this isn’t the test you need.
California’s Clean Truck Check program became fully enforceable on January 1, 2025. Every truck that fits the criteria above must complete emissions testing twice a year. If you receive a Notice to Submit to Testing from CARB, you have 30 calendar days to get a passing test submitted.
The testing requirement isn’t optional. It’s tied to your registration. Miss your deadline or fail to submit results, and the DMV will flag your vehicle. That means no registration renewal until you’re compliant. It also means you’re at risk during roadside inspections or when entering ports and rail yards.
West Rancho Dominguez is surrounded by enforcement zones. The ports have their own compliance checks. CHP runs roadside inspections on the 710 and surrounding corridors. If you’re operating a non-compliant truck in this area, it’s only a matter of time before it catches up with you. The smarter move is to stay ahead of it and keep your testing current.
If your truck fails, you’ll get a detailed report showing which part of the OBD system triggered the failure. Most failures come from fault codes related to your diesel particulate filter, SCR catalyst, NOx sensors, or other emissions control components.
You’ll need to get the issue repaired before you can retest and pass. Depending on what failed, that could mean replacing a sensor, completing a forced regeneration, or addressing a more serious problem with your aftertreatment system. Once the repair is done, you come back for a retest.
The clock is still ticking if you received a Notice to Submit to Testing. You have 30 days from that notice to submit a passing test. If you’re dealing with a failure, don’t wait until the last minute to handle repairs. Get it diagnosed and fixed as quickly as possible so you don’t run out of time and end up with a registration hold.
Right now, the requirement is twice a year—every six months. That’s the semi-annual testing schedule for all heavy-duty vehicles covered under the Clean Truck Check program.
Starting in October 2027, the frequency increases to quarterly testing. That means every three months instead of every six. CARB is phasing this in gradually, so you have time to adjust your maintenance and compliance schedules.
The best way to stay on top of it is to track your last test date and set a reminder for your next one. Don’t wait until you get a notice from CARB. By the time they send you a Notice to Submit to Testing, you’re already behind and only have 30 days to comply. Stay proactive and test on schedule so you’re never scrambling to meet a deadline.
No. The Clean Truck Check program only applies to diesel trucks that are model year 2013 or newer with OBD-equipped engines. If your truck is a 2012 or older, it’s not subject to this testing requirement.
Older trucks fall under different CARB regulations, like the Truck and Bus Regulation, which has its own compliance requirements related to engine upgrades and particulate filter retrofits. But those older vehicles don’t go through the OBD-based emissions testing that newer trucks do.
If you’re not sure whether your truck qualifies, check your model year and GVWR. If it’s 2013 or newer, over 14,000 pounds, and has an OBD system, then yes—you need to comply with Clean Truck Check. If it doesn’t meet all three of those criteria, this particular test doesn’t apply to you.
Technically, no. If your truck is subject to Clean Truck Check and you’re not in compliance, it’s not legal to operate on California public roads. That includes driving to and from job sites, making deliveries, or even moving the truck to a repair shop.
The bigger issue is enforcement. California Highway Patrol has the authority to conduct Clean Truck Check inspections during roadside stops. Ports and rail yards are also checking compliance at entry points. If you’re flagged as non-compliant, you could be denied access or cited.
The DMV will also place a registration hold on non-compliant vehicles. That means you can’t renew your registration until you submit a passing test and get back into compliance. Once that hold is in place, your truck is effectively grounded. The fines for operating a non-compliant vehicle start at $1,000 and can go much higher depending on the violation. It’s not worth the risk.
The $30 fee is an annual charge that CARB collects as part of the Clean Truck Check program. You pay it once per year, and it’s separate from the cost of the actual emissions test.
You submit the fee through CARB’s CTC-VIS system, which is the same online portal where your test results get uploaded. Most people pay it right after their first passing test of the year. Once it’s paid, you’re covered for the next 12 months.
The fee isn’t optional. If you don’t pay it, your vehicle is considered non-compliant even if you’ve passed your emissions tests. That can trigger the same registration holds and enforcement issues as failing a test. Make sure you handle both the testing and the fee to stay fully compliant.
Most tests take between 20 and 30 minutes if your truck’s OBD system is ready and there are no fault codes. The actual scanning process is quick. We connect to your OBD port, pull the data, and check your emissions control systems.
The time can stretch longer if there’s an issue. If your check engine light is on, if your system isn’t showing readiness, or if we find fault codes that need to be cleared and retested, that adds time. In those cases, you might need to come back after repairs or after completing a drive cycle to reset your monitors.
The best way to keep it fast is to make sure your truck is in good working order before you come in. If your check engine light is on or you’ve been having emissions-related issues, get those looked at first. That way, when you show up for your test, it’s a straightforward pass and you’re back on the road in under an hour.
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