Blog & updates
Compliance news and guides
CTC-VIS login, compliance status and the certificate
CTC-VIS login help: how to check Clean Truck Check compliance status by VIN, what counts as a pass certificate, and where to find official CARB updates.
Read moreBox truck and medium-duty Clean Truck Check guide
Clean Truck Check for medium-duty trucks: Isuzu and Hino box trucks, Class 4, flatbeds, dump trucks and school buses. See if yours is covered.
Read moreMobile Truck Smog Check in Southern California
Mobile truck smog check in Southern California: we bring CARB Clean Truck Check testing to your yard, jobsite or port. See how it works and book.
Read morePrueba de humo y emisiones para camiones en el sur de CA
Prueba de emisiones para camiones en Los Ángeles, Fontana, Ontario y San Diego. Servicio móvil de prueba de humo y OBD en su yarda. Llame o agende hoy.
Read moreTruck smog check in LA County: Carson, Compton, Pomona
Truck emissions testing in Los Angeles County at your yard: Carson, Compton, Pomona, Santa Fe Springs and City of Industry. See which test you need and book.
Read moreFleet Clean Truck Check Compliance Program Guide
Build a fleet Clean Truck Check compliance program: CTC-VIS fleet reporting, leased and farm trucks, recurring testing and records for every VIN.
Read moreTruck Won't Communicate for the CARB OBD Test?
Truck won't communicate for the OBD test, or has DEF and SCR faults? Learn what causes it, what to check, and how to get ready for a Clean Truck Check retest.
Read moreWho Can Perform a Clean Truck Check Test?
Who can perform Clean Truck Check: credentialed testers with CARB-verified equipment. Learn about OBD devices, testing one truck and testing early.
Read moreSmoke Opacity Test and SAE J1667 Explained
What the SAE J1667 snap acceleration test is, how CARB sets opacity limits by engine model year, and how PSIP fits in for pre-2013 diesel trucks.
Read moreClean Truck Check Penalties, Fines and Enforcement
Clean Truck Check penalties explained: DMV registration holds, CARB citations and fines, and what to do now if your truck is out of compliance.
Read moreTruck smog check in the Inland Empire: city-by-city guide
Mobile truck smog check in the Inland Empire: Mira Loma, Jurupa Valley, Moreno Valley, Perris, Temecula, Chino, Corona, Victorville. Book at your yard.
Read moreSemi truck smog check in San Diego County, city by city
Semi truck smog check in San Diego at your yard: Otay Mesa, Chula Vista, El Cajon, Escondido and Oceanside. Learn which test you need and book a mobile visit.
Read moreClean Truck Check 2027 quarterly testing and deadlines
Clean Truck Check 2027 quarterly testing: what CARB's rule says, how your 2026 deadlines work, what may still change and how to plan your fleet's tests now.
Read moreClean Truck Check exemptions list: is your truck exempt?
Clean Truck Check exemptions list: which vehicles fall outside the program, which cases CARB decides, and how to confirm your truck's status before you skip.
Read moreCheck engine light and Clean Truck Check: will you pass?
Will a check engine light or unset readiness monitors fail Clean Truck Check? What the CARB OBD test looks at and how to get your truck ready to pass.
Read moreCTC-VIS registration: how to register your truck
A plain-English CTC-VIS registration guide: set up your account, add each truck, pay CARB's fee and check compliance status before a deadline sneaks up.
Read moreClean Truck Check compliance fee, explained
What the Clean Truck Check compliance fee is, who pays it, when it's due and why it's separate from your test cost. Avoid a surprise DMV hold.
Read moreClean Truck Check DMV registration hold: how to clear it
Got a DMV registration hold for CARB Clean Truck Check? Learn why it happens, what clears it and how to get your truck tested fast in Southern California.
Read moreFailed Clean Truck Check? What to do next
Failed Clean Truck Check? Learn the common causes of OBD and smoke test failures, VIN mismatches and no-communication errors, and how to retest.
Read moreDPF deletes, smoke and Clean Truck Check
Will a DPF or EGR delete pass Clean Truck Check? No. Here's why deleted trucks fail, what causes excess smoke and how a legal, working truck passes.
Read moreClean Truck Check vs smog check vs PSIP
Clean Truck Check vs smog check vs PSIP: which test does your truck need? How CARB's heavy-duty program differs from regular smog and DOT inspections.
Read moreWhich vehicles need Clean Truck Check? A truck-type guide
Which vehicles need Clean Truck Check? Semis, box trucks, dump trucks, buses and motorhomes over 14,000 lb GVWR. See which test yours needs and how to book.
Read moreDoes my F-350 need Clean Truck Check? The GVWR rule
Does my F-350 need Clean Truck Check? Most pickups are under 14,000 lb GVWR and not covered. Here is how to check yours and when heavy-duty pickups qualify.
Read moreMotorhome Clean Truck Check: RVs over 14,000 lb
Motorhome Clean Truck Check explained: which diesel RVs over 14,000 lb GVWR are covered, which test they need, and how we test at your home or storage lot.
Read moreFreightliner OBD test and other brands: CARB guide
Freightliner OBD test, plus Peterbilt, Kenworth, International, Volvo and Mack: which trucks get the CARB OBD test, which get a smoke test and how to prepare.
Read moreClean Truck Check en español: prueba de emisiones móvil
Prueba de emisiones para camiones en California: qué es el Clean Truck Check, qué prueba necesita su camión y cómo hacerla en su yarda. Le explicamos todo.
Read moreClean Truck Check: what California truck owners need to know
A plain-English overview of CARB’s heavy-duty inspection program: who it covers, which test your truck needs and how to stay ahead of deadlines.
Read moreWhat happens if I miss my Clean Truck Check deadline?
Missing a Clean Truck Check deadline makes a truck non-compliant. Here are the consequences and how to get back on track fast.
Read moreCan Clean Truck Check be done at my yard?
Yes. Mobile Clean Truck Check testing comes to your yard, jobsite or terminal. Here is how an on-site visit works.
Read moreHow to pass the CARB smoke test
Practical steps to help older diesel trucks pass the Clean Truck Check smoke opacity test the first time.
Read moreHow much does Clean Truck Check cost in California?
Clean Truck Check costs come in two parts: CARB’s annual compliance fee and the testing fee. Here is how to budget for both.
Read moreDoes Clean Truck Check apply to out-of-state trucks?
Yes. Out-of-state and Mexico-registered trucks over 14,000 lbs GVWR that drive in California are covered. Here is what carriers need to do.
Read moreHow often do trucks need Clean Truck Check?
Most covered trucks test twice a year today, with quarterly testing for OBD trucks scheduled from October 2027. Here is what that means for your fleet.
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