CARB Clean Truck Check Compliance Certificate

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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.