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

What is HD I/M in California?

TheThe CARB HD I/M Program, also called the Clean Truck Check, is a California rule that helps make sure diesel trucks, motorhomes, and other heavy-duty vehicles are safe and not making too much pollution. This program is known as the Heavy-Duty Inspection and Maintenance Program. It is for trucks with a GVWR over 14,000 lbs, including non-gasoline vehicles. The goal is to keep the air clean by having trucks go through regular emissions testing and fixing any problems. Trucks must meet all the diesel inspection requirements to keep driving.

Clean Truck Check Program

Table of Contents

Understanding the Heavy-Duty Inspection and Maintenance Program (HD I/M)

California made the HD I/M Program to check and limit the pollution from big trucks and alternative fuel vehicles. The state uses tools like remote emissions monitoring, roadside emissions detection, and OBD data submission to check emissions. Trucks that make too much pollution are found through high-emitter screening. If your truck is picked, you have to fix it and pass a test to get a vehicle compliance certificate. This program keeps trucks running safely while also helping the air stay clean. For drivers in Riverside County, you can now access the Clean Truck Check in Canyon Lake, CA to stay compliant with the HD I/M rules.

Who Needs to Follow HD I/M Rules in California?

If you drive or own a diesel truck, bus, or diesel motorhome that weighs over 14,000 pounds, you must follow the Clean Truck Check rules. These rules are for California-based and out-of-state vehicles that drive in the state. If you have a USDOT number or are listed in the HD I/M database, you are part of the program. Whether you own a company or just one truck, you must follow these rules to avoid enforcement actions like fines or missed registration renewals.

Which Trucks Are Affected by HD I/M Regulations?

All big trucks like diesel trucks, school buses, motorhomes, and non-gasoline vehicles over 14,000 pounds must follow these rules. Trucks that run on diesel, natural gas, or biodiesel are included. These vehicles must pass an opacity test, also known as a smoke test SAE J1667, and other checks. If your truck is in California or just passes through, these rules still apply. Even trucks that only drive short distances have to follow the HD I/M rules. If you're located in Riverside County, you can stay compliant by visiting the Clean Truck Check in Desert Hot Springs, CA.

What Truck Owners Must Do to Stay in Compliance

To stay in line with the rules, truck owners must send in OBD data, complete periodic testing, and keep the emissions control system working. If your truck gets a high-emitter notice, you have to fix it and test again before the compliance deadline. You also need to make sure your VIN reporting and diesel vehicle reporting are correct in the CARB reporting system. When your truck passes, you get a compliance certificate. Without it, you can’t renew your diesel truck registration.

HD I/M Testing – What Happens If You Fail?

If your truck fails the smoke opacity test or is flagged by remote emissions monitoring, you will get a Notice to Submit for Testing. This means your truck makes too much pollution and needs repairs. If you don’t fix the truck and take the test again in time, CARB might give you a fine, stop your registration renewal, or block your truck from driving. It’s very important to fix your truck fast, test again, and upload your data to the HD I/M database to avoid getting an emissions violation notice.

How to Respond to a Notice to Submit for Testing (NST)

If you get a Notice to Submit for Testing, you should take action right away. This means your truck was flagged by roadside emissions monitoring or another check. You have to go to a testing station or call a mobile truck repair team to do the needed diesel emissions repair. After the truck is fixed, the repair shop helps you send your test results to CARB. This includes OBD data submission, smoke tests, and fixing any emissions control system problems. Doing this fast helps you avoid fines and compliance deadline issues.

HD I/M Reporting and Compliance Fees Explained

Every truck in the CARB HD I/M Program must pay a yearly compliance fee. This money helps the state keep the air clean. If you don’t pay, you might not get your diesel truck certification or be able to renew your vehicle registration. You also must keep up with VIN reporting and fleet compliance service records. If you don’t report or pay the fee, CARB may take enforcement action, and your truck might not be allowed to drive in California.

Our Services to Help You Pass HD I/M Testing

We offer diesel compliance consulting, emissions testing, and repair services for trucks in California. Whether you drive one truck or manage a big fleet, we help you stay up to date with CARB reporting and follow all the diesel regulation California has. We handle OBD data submission, fix emissions control systems, and help you pass your test. We also help with compliance certificate lookup, registration renewal, and clearing high-emitter screening notices.