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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