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Clean Truck Check

California Clean Truck Check Program

Overview

A mandatory inspection program ensuring heavy-duty vehicles meet emissions standards. Reduces diesel pollutants, improves statewide air quality, and supports California's 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

  1. 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
  2. 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
  3. 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
  4. Maintain compliance records
    • Keep digital or physical copies of test results
    • Store records for at least 4 years
    • Have documentation available during roadside inspections
  5. 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

Penalties for Non-Compliance

  • Fines ranging from $300-$1,800 per violation
  • Potential vehicle impoundment for repeat offenders
  • DMV registration holds
  • Restricted access to ports and intermodal facilities

Benefits of Compliance

  • Reduced air pollution and greenhouse gas emissions
  • Improved public health outcomes
  • Better fuel efficiency and potential cost savings
  • Avoiding costly penalties and operational disruptions
  • Contributing to California’s climate goals

Resources

  • Find authorized testing locations
  • Schedule testing appointments
  • Access compliance assistance
  • Review testing requirements
  • Get answers to frequently asked questions
  • Download the mobile compliance app

Note: The California Clean Truck Check program requirements may change. Always check the official CARB website for the most current information.