Hear from Our Customers
Your truck sits because the DMV flagged it. Your registration’s on hold. You’re losing money every day it’s parked.
That’s what happens when CARB emissions testing gets missed or done wrong. California doesn’t send reminders. They send holds—and fines that start at $1,000 per day, per vehicle.
If you’re running semi trucks or heavy-duty commercial vehicles with diesel engines from 2013 or newer and a gross vehicle weight rating over 14,000 pounds, you’re required to submit passing Clean Truck Check results twice a year. Miss a deadline and your truck doesn’t move until you’re compliant again.
You stay ahead of deadlines. Your trucks stay registered. Your business keeps moving. That’s what CARB compliant testing does when it’s handled right.
We serve South Whittier and the surrounding Los Angeles County trucking corridor with CARB credentialed emissions testing. We’re licensed, trained, and equipped to handle the specific requirements for 2013 and newer diesel trucks over 14,000 pounds.
South Whittier sits between major distribution hubs, the ports, and inland freight routes. That means tight schedules and zero tolerance for compliance mistakes. We built our testing process around that reality.
You’re not dealing with a general smog shop trying to figure out heavy-duty regulations. You’re working with testers who know OBD data submission, CTC-VIS registration, and exactly what CARB requires to clear your trucks.
First, we verify your truck qualifies—model year 2013 or newer, diesel engine, over 14,000 pounds GVWR. If it doesn’t meet those criteria, you don’t need this test.
Next, we connect to your truck’s onboard diagnostics system and pull the emissions data CARB requires. This isn’t a visual inspection or a tailpipe test. It’s OBD data submission that gets uploaded directly into the CTC-VIS database.
Once the test is complete and your truck passes, the results go straight to CARB and the DMV. Your compliance record updates automatically. If there’s a registration hold, it gets released. If your deadline’s coming up, you’re covered.
You get documentation showing your test date, results, and next compliance deadline. Keep that handy—it’s proof your truck is legal to operate in California and access freight facilities that require Clean Truck Check compliance.
Ready to get started?
Right now, if you’re operating a heavy-duty diesel truck from 2013 or newer over 14,000 pounds in California, you need to test twice a year. Those deadlines are tied to your registration month—January or July for most operators.
Starting in 2027, testing frequency increases to four times per year for OBD-equipped vehicles. That’s not a maybe. That’s the regulation.
Every test costs you time and money, but skipping one costs more. DMV registration holds stop your truck cold. Daily fines start at $1,000 and climb from there. Freight facilities won’t let non-compliant trucks through the gate.
South Whittier’s location puts you in the middle of some of the strictest enforcement zones in the state. CARB uses roadside monitoring devices throughout Los Angeles County to flag high-emitting vehicles. If your truck gets flagged, you’ll receive a Notice to Submit to Testing—and you’ve got a narrow window to comply before penalties kick in.
Your compliance window opens 90 days before your registration renewal. Don’t wait until the last week. Get tested early, get it done right, and keep your trucks working.
Your truck needs this test if it meets three criteria: diesel engine, model year 2013 or newer, and gross vehicle weight rating over 14,000 pounds. This applies to semi trucks, commercial vehicles, transit buses, motorcoaches, and California-registered motorhomes that fit those specs.
If your truck is older than 2013 or weighs less than 14,000 pounds, you don’t need Clean Truck Check testing. You might need a different type of smog check, but not this one.
Out-of-state trucks operating in California also need to comply if they meet the weight and model year requirements. Registration location doesn’t matter—if you’re running the truck in California, CARB regulations apply.
Right now, testing happens twice a year—every six months based on your registration renewal cycle. Your compliance deadlines are tied to whether your registration comes due in January or July.
That frequency is increasing. By October 2027, trucks with 2013 or newer engines will need testing four times per year. CARB isn’t asking—they’re phasing it in as part of the Clean Truck Check program expansion.
Your compliance window opens 90 days before your registration is due. You can test anytime during that window, but you need a passing result submitted before your renewal date or the DMV puts a hold on your registration.
Missing a deadline doesn’t just delay your registration. It stops your truck from operating legally until you’re compliant again.
If your truck fails, you’ll get a report showing what triggered the failure—usually an emissions system malfunction or OBD fault code. You’ll need to get the issue repaired before you can retest.
Once repairs are done, you come back for another test. The retest follows the same process: OBD data gets pulled, uploaded to CTC-VIS, and submitted to CARB and the DMV.
You can’t register your truck or clear a DMV hold without a passing test result. That means the truck stays parked until it’s fixed and retested. Repair costs vary depending on what’s wrong, but annual compliance expenses including testing and repairs typically run between $2,500 and $4,500 per vehicle.
The longer you wait to address a failure, the more it costs you in lost revenue and potential fines. Get it fixed fast and get back on the road.
Yes. Mobile testing brings the equipment to your location so your trucks don’t have to leave the yard. That cuts downtime and keeps your operation moving while you stay compliant.
Mobile testing works the same way as shop testing—we connect to your truck’s OBD system, pull the required emissions data, and upload results directly to CARB and the DMV. You get the same compliance certification, just without the drive.
For fleets running multiple trucks, mobile testing makes scheduling easier. You can get several trucks tested in one visit instead of pulling them off routes one at a time.
Mobile fees vary depending on location and fleet size, but the time saved and reduced disruption usually make it worth the cost—especially when you’re managing tight delivery schedules in the South Whittier and LA County area.
Testing prices in the South Whittier and Los Angeles County area typically range from $50 to $190 depending on the provider and whether you need mobile service. Mobile testing adds an additional fee, usually around $75, but saves you the time and fuel cost of driving your truck to a shop.
You also pay an annual compliance fee to CARB—$31.18 in 2025, increasing to $32.13 in 2026. That fee is separate from the testing cost and goes directly to the state.
If your truck fails and needs repairs, costs go up. Depending on what’s wrong, you could be looking at anywhere from a few hundred dollars for a sensor replacement to several thousand for emissions system work.
Compare that to the cost of non-compliance: $1,000+ per day in fines, registration holds that stop your truck from operating, and potential loss of access to freight facilities. Testing is cheap insurance against much bigger problems.
Regular smog checks apply to passenger vehicles and lighter trucks under 14,000 pounds. Clean Truck Check testing is specifically for heavy-duty diesel vehicles—model year 2013 or newer, over 14,000 pounds GVWR.
The testing process is different too. Regular smog checks often involve tailpipe emissions measurements and visual inspections. Clean Truck Check uses OBD data—your truck’s onboard diagnostics system reports emissions performance directly to CARB through the CTC-VIS database.
Not every smog shop can perform Clean Truck Check testing. Testers need to be CARB credentialed, which requires completing specific training and passing an exam. The equipment has to meet SAE J1667 specifications and connect properly to heavy-duty diesel OBD systems.
If you show up at a regular smog shop with a 2013 or newer semi truck over 14,000 pounds, they probably can’t help you. You need a facility that’s set up for heavy-duty vehicle compliance—and that’s what we do.
Local Resources
Useful Links
Other Services we provide in South Whittier
