Program requirements are currently in effect

Stay Compliant with
Clean Truck Check

California's CARB Heavy-Duty Inspection & Maintenance program for trucks over 14,000 lbs GVWR. Simple guidance to avoid penalties and keep your fleet on the road.

Access CTC-VIS Portal View Compliance Steps

Includes out-of-state vehicles

Annual fee + testing required

14,000+ lbs

GVWR threshold

Semi-Annual

Testing for most vehicles

$32.13

Annual compliance fee (2026)

Statewide

Enforced at ports & roads

CALIFORNIA AIR RESOURCES BOARD

What is Clean Truck Check?

Clean Truck Check (also known as the Heavy-Duty Inspection and Maintenance or HD I/M program) is a CARB initiative designed to reduce emissions from heavy-duty diesel and alternative-fuel vehicles operating on California roads.

The program requires vehicle owners to regularly report vehicles, pay an annual compliance fee, and submit passing emissions tests performed by credentialed testers. It applies to both California-registered and out-of-state vehicles.

Key Goals

Identify high-emitting trucks
Ensure emissions systems function properly
Improve air quality across California
Level the playing field for compliant operators

DOES THIS APPLY TO YOU?

Program Requirements

Vehicles Subject to CTC

GVWR greater than 14,000 lbs
Diesel or alternative fuel engines
Operate on CA public roads (incl. out-of-state registered)
Includes trucks, buses, and some motorhomes

Gasoline vehicles are generally exempt (subject to BAR Smog Check instead).

Common Exemptions

Vehicles subject to BAR Smog Check program
Certain agricultural vehicles (see CARB guidance)
Emergency vehicles in some cases
Motorhomes used only for personal/recreational purposes (annual requirements may still apply)

Always verify your specific vehicle in the CTC-VIS portal.

Your Key Obligations

1. Register every subject vehicle in the CTC-VIS database

2. Pay the annual compliance fee by your deadline

3. Have emissions tests performed by a credentialed tester

4. Maintain compliance or face registration blocks & penalties

4 SIMPLE STEPS

How to Become Compliant

Follow these steps to meet Clean Truck Check requirements.

Register Your Vehicles

Create an account and add every applicable vehicle to the official CTC-VIS portal.

Start here

Pay Annual Fee

Pay the compliance fee ($32.13 in 2026) for each vehicle. Fees are due according to your vehicle-specific deadline in CTC-VIS.

Required every year

Get Emissions Tested

Use a CARB-credentialed tester. Newer OBD-equipped vehicles get a scan; older diesels require smoke opacity + visual inspection.

Tests accepted up to 90 days before deadline.

Submit & Maintain

Your tester submits results electronically. Monitor your CTC-VIS account for status, notices, and upcoming deadlines. Re-test on schedule.

Keep records

Deadlines are unique to each vehicle. Log into CTC-VIS for your exact dates.

Testing Frequency & Deadlines

Most vehicles must demonstrate compliance twice per year (semi-annual).

Starting October 2027, OBD-equipped vehicles will move to quarterly testing (four times per year). Agricultural vehicles and certain motorhomes remain annual.

View official deadline tables

PRO TIP

You can submit passing test results up to 90 days early. This gives time to repair any issues before your deadline.

CHECK YOUR ACCOUNT REGULARLY

PROFESSIONAL SUPPORT

How We Can Help Your Fleet

On-Site Emissions Testing

Certified testers come to your yard or terminal. OBD scans, smoke opacity tests, and visual inspections completed quickly with results submitted directly to CARB.