OBD emissions compliance test
For 2013 and newer diesel and 2018 and newer alternative-fuel engines. We scan your engine's OBD data with a CARB-certified device and submit the result.
OBD-equippedWe bring the Clean Truck Check to you.
Mobile CARB emissions compliance testing for diesel trucks, big rigs, and RVs across the Inland Empire and San Diego County. On your yard, on your schedule.
License #049917
Fully insured
15+ years in diesel
CARB Update
March 2026: Clean Truck Check requirements are in effect for all subject vehicles, including trucks registered outside California when operating in the state. Vehicles must report, pay the annual compliance fee, and submit passing emissions tests through CTC-VIS.
OBD & non-OBD testing
CARB-credentialed
We come to you
Fleets & owner-operators
Inland Empire & San Diego
Our services
Every part of the Clean Truck Check, handled on site.
We run the right test for your engine, inspect your emissions equipment, and submit your passing result to the state. One visit, fully compliant.
Opacity & smoke test
Snap-idle smoke opacity testing for 2012 and older diesel engines, the non-OBD path also known as the OVI test.
Non-OBD dieselEmissions equipment inspection
A visual inspection of your vehicle's emissions control equipment, required for non-OBD diesel and alternative-fuel vehicles.
Visual inspectionCTC-VIS reporting
We submit your passing results into the Clean Truck Check Vehicle Inspection System so your compliance record updates without the paperwork.
State submissionFleet & recurring compliance
Scheduled semi-annual testing for your whole fleet, tracked to each vehicle's deadline so nothing lapses.
Fleets welcomeMobile, at your location
We drive to your yard, terminal, or home base across the Inland Empire and San Diego County. No trip to a test station.
On-site service
On-site checklist
What a mobile inspection includes
A single visit covers identification, testing, the visual inspection, and state submission. You leave road-legal with your deadline in hand.
- Vehicle & engine ID check (VIN, year, GVWR)
- OBD scan with a CARB-certified device
- Snap-idle opacity test for older diesels
- Visual inspection of emissions equipment
- Pass or fail reviewed with you on the spot
- Passing result submitted to CTC-VIS
How it works
From booking to compliant in one stop.
Book
Call or send the form with your vehicle details. We confirm a time that fits your route.
We come to you
Our credentialed tester drives to your yard or home base anywhere in the IE or San Diego.
We test
OBD scan, or opacity plus the visual inspection, whichever your engine requires.
We submit
Your passing result goes straight into CTC-VIS. No portal wrangling on your end.
You roll
You stay road-legal and we flag your next deadline so you never get caught out.
On the road with us
Trucks we keep compliant.
From flatbeds and day cabs to sleepers and RVs, we test the vehicles that keep Southern California moving. Real trucks, real yards, real deadlines met.
15+YEARS IN DIESEL
2COUNTIES SERVED
100%MOBILE SERVICE
Who we are
A family-owned diesel shop that came to you first.
GB Mobile Clean Truck Check is a small, family-owned business serving the Inland Empire and San Diego. With more than 15 years in the diesel industry, we know what it takes to keep trucks on the road and how hard California compliance can be to keep up with.
We have deep mechanical knowledge across the makes you run, so a Clean Truck Check with us is quick, accurate, and hassle-free. The new CARB requirements can be confusing, so we partner with you on the whole process, from a single test to a full fleet schedule.
InternationalFreightlinerPeterbiltVolvoHinoFordDodge& more
Who we test for
- Local businesses
- Independent owner-operators
- Fleets of every size
- Government agencies
- RV and motorhome owners
- Out-of-state trucks operating in CA
CTC FAQ
Clean Truck Check, explained.
Straight answers on what the program is, how the inspection works, and what to have ready. For exact fees and deadlines, always confirm with CARB.
Official CARB resources
Look up your vehicle, check its deadline, and read the program rules straight from the source.
Still have a question? Ask usWhat is the Clean Truck Check?
Clean Truck Check, also called the Heavy-Duty Inspection and Maintenance program (HD I/M), is a California Air Resources Board program that makes sure heavy-duty diesel and alternative-fuel vehicles keep their emissions systems working. Most non-gasoline vehicles over 14,000 pounds gross vehicle weight rating that operate in California are subject, including trucks registered in other states.
What is CTC-VIS?
CTC-VIS is the Clean Truck Check Vehicle Inspection System, the online portal CARB uses to track every vehicle. Your registration, annual compliance fee, and passing test results all live in your CTC-VIS account, and each vehicle's testing deadline is listed there under the Testing Details tab. When we finish a passing test, we submit it directly into CTC-VIS for you.
How does the inspection actually work?
It depends on your engine. Trucks with on-board diagnostics (2013 and newer diesel, 2018 and newer alternative fuel) get an OBD data scan using a CARB-certified device. Older diesels (2012 and older) get a snap-idle smoke opacity test plus a visual inspection of the emissions control equipment. Older alternative-fuel vehicles (2017 and older) get the visual inspection only. We run the correct test for your vehicle and report the result.
How often do I need to test?
Most subject vehicles need a passing test twice a year. California-registered motorhomes and qualifying agricultural vehicles test once a year. Beginning in October 2027, OBD-equipped vehicles will be required to report four times a year. Your exact deadline is always shown in your CTC-VIS account.
Is there a fee, and how much?
Yes. CARB charges an annual compliance fee per vehicle, adjusted each year to the California Consumer Price Index. For 2026 the fee is $32.13 per vehicle. That fee is separate from testing and is paid to CARB through CTC-VIS. Confirm the current amount with CARB before you file.
What documentation do I need for a mobile test?
Have your vehicle and engine details ready: the VIN, license plate, gross vehicle weight rating, engine make and model year, and current DMV registration. It helps to have your CTC-VIS account set up so we can submit results right away. If you are not registered yet, we can walk you through it during the visit.
What happens if I fail or miss a deadline?
A vehicle that misses its compliance deadline can be blocked from DMV registration renewal and flagged through roadside and weigh-station enforcement. If your truck does not pass, we tell you exactly what needs attention so you can repair and retest quickly.
Do you test out-of-state trucks?
Yes. If your truck is registered outside California but operates in the state, it is subject to Clean Truck Check. We can test it while you are working in the Inland Empire or San Diego area.
Contact
Book your mobile Clean Truck Check.
Send your details and we will get you scheduled. Have a quick question first? That is fine too.