What is Clean Truck Check?

Clean Truck Check is California's mandatory emissions testing program for heavy-duty diesel vehicles. This program helps ensure trucks operating in California meet the state's strict emissions standards.

Key Requirements

  • Annual testing required for all heavy-duty diesel vehicles operating in California
  • Applies to trucks with GVWR > 14,000 lbs
  • Both OBD (On-Board Diagnostic) testing and visual inspection required
  • Results must be submitted to CARB database

Testing Process

  1. OBD connector check and communication verification
  2. Full diagnostic scan of emission control systems
  3. Visual inspection of emission components
  4. Smoke opacity test (if required)
  5. Results submission to CARB

Need to Schedule a Test?

We provide mobile testing services throughout Los Angeles, Orange County, and the Inland Empire.