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Mobile Clean Truck Check Los Angeles County
All SMOG Motors runs CARB-credentialed HD I/M testing across all of Los Angeles County — from the port corridor in Long Beach to the high desert in Palmdale. This page covers where we go, what we do, and how to get your truck or fleet through the Clean Truck Check without pulling anyone off a route.
CARB Compliance Testing Across Los Angeles County
Los Angeles County is where Clean Truck Check enforcement is most visible — and most active. CARB has deployed roadside emissions monitoring along corridors like the I-710, and trucks running the port-to-Inland-Empire route are screened regularly.
If your VIN isn’t showing compliant in CARB’s CTC-VIS system, it’s only a matter of time before you get a Notice to Submit to Testing — and that gives you 30 days to fix it. The compliance pressure in Los Angeles County is higher than anywhere else in California, and the consequences of falling behind — escalating civil penalties, registration blocks, and the risk of a truck being placed out of service — are real and enforced.
All SMOG Motors is a single-service HD I/M testing operation. We don’t test passenger cars. We don’t split our time between a smog shop and a fleet yard. We test diesel and alternative-fuel trucks with a GVWR over 14,000 pounds, model year 2013 and newer — the exact class CARB’s Clean Truck Check program was built around. Our tester credential is E164983, publicly listed on CARB’s database at arb.ca.gov. You can look it up before you call.
We’re based in Perris, CA, and we travel to Los Angeles County truck yards, fleet yards, job sites, and truck stops. Each test takes 10 to 15 minutes. We can handle 15 to 40 trucks in a single yard visit. Results go directly to CARB’s CTC-VIS system — no manual upload of test results and no follow-up paperwork on your end; we submit everything for you.
The rate is $150 per truck plus a travel fee quoted by distance from our Perris base. Single trucks or full fleets — for larger yards, we test everything in one visit.
One thing worth clarifying: the annual CARB compliance fee — $32.13 per vehicle starting January 1, 2026 — is not the same as passing the emissions test. The fee is paid by the vehicle owner through the CTC-VIS portal; the test is a separate requirement. Paying the fee without submitting a passing OBD test leaves your VIN showing non-compliant in CARB’s system, and DMV will block registration at renewal. We see this confusion regularly, and it’s worth saying plainly before it costs you a renewal cycle. If you’re already blocked, see our DMV registration hold removal service — and if you’re not sure when your truck is due, our CARB deadline calculator will tell you in seconds.
Los Angeles County isn’t one market — it’s five distinct freight environments, and the compliance pressure in each one looks a little different.
The I-710 and I-110 through Long Beach, Carson, West Carson, and Wilmington form the densest truck corridor in the country. Drayage operators here face a double compliance requirement: CARB’s Clean Truck Check program and the San Pedro Bay ports’ Clean Air Action Plan. The I-710 is a priority corridor for zero-emission drayage programs, and enforcement infrastructure is already in place along that route. If you’re running containers out of San Pedro Bay, your compliance window is tighter than anywhere else in Los Angeles County.
The I-10 and SR-60 through Alhambra, El Monte, and Rowland Heights toward the City of Industry carry a heavy mix of import/export warehousing, food distribution, and last-mile logistics — box trucks, flatbeds, and refrigerated units running daily. The I-605 ties the whole eastern San Gabriel Valley together north to south.
Torrance, CA, Gardena, and Lomita sit at the intersection of the I-405 and I-110. Trucks here move between the port and the broader Los Angeles basin — a mix of drayage-adjacent routes and regional distribution runs. It’s a high-frequency testing area because the same trucks often touch both port corridors and inland delivery zones.
Commerce, Vernon, and the warehouse district running along the I-5 form one of the most industrially dense parts of Los Angeles County. Vernon alone generates significant refrigerated and distribution truck traffic year-round. The I-5 corridor through this area connects directly to the I-710 interchange at Commerce, making it a natural second stop for port-area compliance runs. Fleet manager planning ahead? See our guide to Q4 fleet emissions testing in Los Angeles County.
Palmdale and Lancaster sit at the far north end of Los Angeles County on the SR-14, and local HD I/M testing options up there are essentially nonexistent. If you’re running a construction fleet, hauling aerospace components, or managing general freight out of the high desert, mobile service isn’t just convenient — it’s the only practical option. We make the drive.
Yes. The port and drayage corridor is one of the highest-demand areas we serve throughout Los Angeles County. Drayage trucks running the I-710 and I-110 face active CARB enforcement along those routes, and many port operators also have to meet the San Pedro Bay ports’ Clean Air Action Plan requirements on top of Clean Truck Check. We come to your yard or staging area — you don’t need to bring the truck to us.
Mostly yes — but this changed in 2026, so here’s the honest picture. In January 2026, EPA disapproved the part of Clean Truck Check that applies to out-of-state-registered trucks, and federal enforcement won’t happen on those vehicles. CARB, however, has said it will keep enforcing the program under state law on all trucks operating in California — in-state or not — and its roadside monitoring doesn’t check your registration state before flagging you. California-registered trucks are unaffected: fully enforceable, DMV holds and all. If your truck is registered elsewhere but runs Los Angeles County routes, call us and we’ll talk through where you actually stand. For out-of-state trucks, compliance deadlines run off the last digit of your VIN.
No. Most trucks are done in about ten minutes — fifteen at the outside. We connect a CARB-approved OBD device directly to your truck’s ECU, pull the emissions data, and submit it electronically to CARB’s CTC-VIS system on the spot. Your driver stays with the truck. There’s no trip to a shop, no overnight drop, and no follow-up paperwork on your end. For fleets, we can work through 15 to 40 trucks in a single yard visit — most operations are done before the morning dispatch window closes.
We cover all of Los Angeles County — port corridor to the Antelope Valley, South Bay to the San Gabriel Valley — with travel fees quoted by distance at booking. If your city is linked below, click through for location-specific details. If you don’t see yours listed or you’re not sure whether your truck qualifies, just call — we’ll give you a straight answer.
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