California Clean Truck Check (HD I/M Program)

Required by Law. Powered by APD.

If your diesel truck operates in California, you are now required to comply with the California Clean Truck Check program — also known as the Heavy-Duty Inspection and Maintenance (HD I/M) Program — enacted by the California Air Resources Board (CARB).

This regulation is not optional — it’s the law. And non-compliance can result in hefty fines and registration holds on your vehicle.

What Is the California Clean Truck Check?

The Clean Truck Check is a new emissions testing program designed to reduce air pollution from heavy-duty trucks operating in California. As of 2023, nearly all diesel trucks with a Gross Vehicle Weight Rating (GVWR) of 14,000 lbs or more must undergo regular emissions inspections — even if the truck is registered out of state but operates in California.

Who Needs to Comply?

You’re required to participate if you operate:

• Diesel or alternative-fuel trucks over 14,000 lbs GVWR

• Buses and box trucks

• Delivery vehicles and cargo vans used in commercial operations

• Out-of-state trucks that enter California

• Fleets operating within the state

This applies to both private owners and commercial fleets.

Why Is It Required?

California has some of the strictest air quality standards in the nation. The Clean Truck Check program was launched to:

• Reduce emissions from high-polluting vehicles

• Ensure diesel trucks are properly maintained

• Hold all vehicles to consistent emissions standards, regardless of registration state

• Support California’s clean air goals and environmental health

How Often Do You Need to Test?

Beginning in 2024, most trucks will be required to submit semi-annual emissions compliance tests through certified vendors.

APDCarb is a certified mobile tester, which means we come directly to your vehicle and complete your smog testing on-site — saving you time, downtime, and headaches.

Avoid Fines and Penalties

Failure to comply with Clean Truck Check regulations can result in:

• DMV registration holds

• Fines of up to $1,000 per violation

• Delays in business operations

• Loss of fleet compliance

Let APDCarb keep you protected and compliant.

Schedule Your Clean Truck Check with APDCarb

We make it easy:

• We come to your location — yard, job site, or roadside.

• We test your truck with state-certified equipment.

• We submit results directly to CARB, keeping your fleet in good standing.

Don’t risk fines or downtime — book your mobile Clean Truck Check today and keep your business rolling.

👉 Call now or book online to schedule your inspection.