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CARB Clean Truck Check Compliance Certificate

engine filter

Clean Truck Check (HD I/M) Compliance Certificate

 The Clean Truck Check HD I/M Program requires heavy-duty trucks to undergo inspection and maintenance to ensure compliance with emission standards and reduce pollution. 

 Almost all non-gasoline heavy-duty vehicles with a GVWR over 14,000 lbs. that operate in CA must be compliant with Clean Truck Check. Out of state vehicles have the same compliance requirements as California registered vehicles.  

Get Compliant Today

Frequently Asked Questions

Please reach us at operations@hcmintegrityservices.com if you cannot find an answer to your question.

Clean Truck Check, also known as Heavy-Duty Truck Inspection and Maintenance (HD I/M), is a California Air Resources Board (CARB)‑mandated emissions program that ensures heavy‑duty diesel trucks maintain proper emissions control systems. It applies to diesel vehicles with a gross vehicle weight over 14,000 lbs, including those registered out-of-state but operating in California.

Key Requirements:

  • Biennial or semi‑annual inspections, depending on your vehicle type .
     
  • Testing conducted by CARB‑credentialed testers, measuring emissions via onboard diagnostics, smoke opacity, and visual inspections.
     
  • Must register vehicles and pass testing before renewing DMV registration in California.
     

Benefits of Compliance:

  • Reduces NOₓ and particulate pollution, contributing to cleaner air.
     
  • Prevents fines, DMV holds, and registration denial—ensuring uninterrupted operations in California.
     
  • Improves engine efficiency, potentially lowering fuel costs and downtime.
     


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