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Clean Truck Check | California's Emissions Program
Truck Maintenance Guide

Who Needs to Comply with Clean Truck Check?

California’s Clean Truck Check is now a critical program for any fleet operating heavy-duty vehicles within the state. Whether your fleet is based in California or crosses into the state from elsewhere, understanding CARB emissions compliance is essential to avoid costly penalties. This guide breaks down who needs to comply with the Clean Truck Check 2025, what vehicles are affected, and how your operation can stay ahead of diesel truck emissions testing requirements under the HD I/M Program.

Clean Truck Check Program

Table of Contents

What Is the Clean Truck Check and Why Does Compliance Matter?

The Clean Truck Check California is also called the Heavy-Duty Inspection and Maintenance (HD I/M) program. It was made by the California Air Resources Board (CARB) to help cut down on pollution from diesel trucks that weigh over 14,000 pounds. This program uses CC-ROBD telematics, periodic compliance testing, and the CTC-VIS system to check if trucks follow the rules. Who needs to comply with Clean Truck Check?Any business with heavy-duty trucks must meet the requirements. If a truck doesn’t follow the rules, the company may have to pay fines or stop using the truck. That’s why emissions compliance is very important for any business with trucks.

Which Vehicles Must Comply with Clean Truck Check Requirements?

Any big diesel truck must follow the CARB Clean Truck Check rules, even if it comes from another state. This includes trucks used for work, farming, RVs, and government use. Trucks with J1939 or J1979 protocol must send emissions data using CARB-approved telematics or get tested by a CARB credentialed tester. Some gas trucks and older diesel trucks have different rules, but all must follow the laws about diesel fleet emissions.

Is Your Fleet Affected by California’s Clean Truck Check Program?

If your fleet has heavy-duty trucks that drive in or through California, it must follow fleet compliance California rules. No matter where your trucks are from—California or out of state—you need to follow diesel compliance California laws, sign up in the CTC registration system, and follow the VIN-based testing schedule. Fleets also have to pay the CTC compliance fee and make sure they send the right truck emissions data submission on time.

How Clean Truck Check Compliance Impacts Fleet Operations

The CARB Clean Truck Check changes how fleets do vehicle maintenance and emissions checks. Now, fleets must follow diesel smog check California rules during normal truck services. If a fleet doesn’t follow the rules, it might not get its truck compliance certificate, and the truck could lose its DMV registration. There could also be large fines. Fleets must track emissions compliance deadlines, collect data using CARB telematics reporting, and make sure all trucks are clean and ready. For fleets operating in Clean Truck Check in Indio, CA, it’s important to stay compliant with all local testing and reporting requirements.

Key Requirements Fleets Must Follow to Stay Compliant

To follow the rules, fleets must register each truck in the CTC-VIS system, pay the CTC compliance fee, and send test results by the VIN-based testing schedule. Trucks must be tested by CARB credentialed testers or use approved telematics that work with J1939/J1979 protocols. Fleets must also watch truck performance and fix anything that could cause the truck to fail. Doing all this helps fleets stay safe, legal, and ready for inspections.

Periodic Compliance Testing: What Fleet Managers Need to Know

Periodic compliance testing is a key part of the HD I/M Program. CARB says most big trucks must be tested at least two times each year. Each truck has its own testing date based on the VIN-based schedule. Fleet managers must send results to the CTC-VIS system on time. If they miss the date, their truck may not get a truck compliance certificate and could face penalties or be taken off the road.

Preparing for the Future: Staying Ahead of Clean Truck Check Regulations

CARB emissions compliance rules may change again in the future. That’s why fleet managers need to stay ready for updates to the Clean Truck Check 2025. CARB might add new reporting steps, require different telematics devices, or change the way diesel fleet emissions are checked. To stay ahead, managers should train their teams on vehicle regulations and use smart systems that track truck emissions enforcement and service needs.

Schedule a Demo and See How Verizon Connect Supports Compliance

Staying compliant with the Clean Truck Check can be tricky, but Verizon Connect makes it easier. Their tools work with CARB telematics reporting and can collect and send emissions data using CC-ROBD telematics. Verizon Connect gives alerts about emissions compliance deadlines, checks for problems, and connects with the CTC-VIS system. This helps fleets stay legal, safe, and running smoothly.