Truck Smog Check by All PRO SMOG specializes in heavy-duty diesel truck and 18-wheeler smog inspections. Our certified technicians use cutting-edge technology to ensure compliance with California’s stringent emissions standards. We offer efficient, thorough service with exceptional customer support. Trust us to keep your fleet running clean and compliant.

Clean Truck Check

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All PRO SMOG STATION

We’re a mobile Clean Truck Check inspection service—we come to you!

Book a Clean Truck Check

TRACY call: (209) 830-0086
Manteca Call: (209) 823-6263
Stockton Call: (209) 478-7664

Book a mobile diesel smog check with us online, or by calling us at (209) 622-9156. We offer flexible times and will come to your location

Senate Bill 210 (Leyva; Chapter 298, Statutes of 2019) instructed CARB to develop and execute a comprehensive regulation for the inspection and maintenance of heavy-duty vehicles (HD I/M) to ensure that their emissions control systems are working properly while on California’s roads. The Board approved the regulation on December 9, 2021, and it will be gradually implemented starting in January 2023. The program, called Clean Truck Check, combines periodic vehicle testing requirements with other emissions monitoring techniques and expanded enforcement strategies to identify vehicles needing emissions-related repairs and ensure that necessary repairs are carried out. Once fully implemented, the program will significantly reduce smog-forming and carcinogenic toxic air pollution, essential for meeting federal air quality requirements and ensuring clean air in California’s

California Clean Truck Check Program

Overview

California Clean Truck Check is a mandatory inspection and maintenance program designed to ensure heavy-duty vehicles operating in California meet emissions standards. This program helps reduce harmful pollutants from diesel trucks, improving air quality throughout the state and helping California meet its climate goals.

Types of Clean Truck Check Services

1. OBD (On-Board Diagnostics) Testing

Most newer heavy-duty vehicles (model year 2013 and newer) equipped with on-board diagnostic systems must undergo periodic OBD testing:

Tests engine and emissions control systems through the vehicle’s computerized diagnostic system
Verifies proper functioning of emissions components
Quick process that can be completed in approximately 15-30 minutes
Required every 6 months for most vehicles

2. Opacity Testing

For older vehicles (pre-2013) without OBD systems:

Measures the density of smoke emitted from the exhaust
Determines if particulate matter emissions exceed legal limits
Takes approximately 30-45 minutes to complete
Required annually for applicable vehicles

3. Visual Inspection

All heavy-duty vehicles must undergo visual inspections:

Checks for tampering with emissions control systems
Ensures all emissions components are present and properly connected
Verifies no visible smoke or leaks
Conducted alongside other testing methods

4. Roadside Emissions Monitoring

The California Air Resources Board (CARB) conducts random roadside emissions testing:

Uses remote sensing technology to measure emissions as vehicles drive by
Identifies high-emitting vehicles for follow-up inspections
Supplements the regular testing program
No action required by drivers unless contacted for follow-up

Requirements for Truckers

Who Must Comply

All heavy-duty diesel vehicles with a GVWR of 14,001+ pounds operating in California
Includes out-of-state trucks that enter California
Both fleet-owned and independent operator vehicles
Exemptions may apply for certain emergency, military, or historic vehicles

Testing Schedule

Vehicle Type	Testing Frequency	First Compliance Date
2013+ with OBD	Every 6 months	January 1, 2024
Pre-2013 without OBD	Annual opacity test	July 1, 2023
All vehicles	Annual visual inspection	Concurrent with other tests

Compliance Steps

Register in CARB’s reporting system
- Create an account in the TRUCRS (Truck Regulation Upload, Compliance, and Reporting System)
- Provide vehicle and owner information
- Pay the annual compliance fee
Schedule testing at approved facilities
- Find an authorized Heavy-Duty Vehicle Inspection and Maintenance (HD I/M) testing location
- Testing can be performed at certified truck stops, fleet facilities, or mobile testing units
- Testing appointments can be scheduled online or by phone
Complete required testing
- Bring your vehicle and registration documents to the testing facility
- Testing technicians will perform appropriate tests based on vehicle type
- Results are electronically submitted to CARB
Maintain compliance records
- Keep digital or physical copies of test results
- Store records for at least 4 years
- Have documentation available during roadside inspections
Address any failures promptly
- If your vehicle fails testing, repairs must be completed within 90 days
- Re-testing is required after repairs
- Continued operation of non-compliant vehicles may result in penalties