17760 Valley Blvd Ste A Bloomington, CA 92316

Carb Certified

Program Overview

What is it?

A new program similar to Smog Check but for heavy-duty vehiclesClean Truck Check previously referred to as Heavy-Duty Inspection and Maintenance (HD I/M)

Who is regulated?

Diesel and alternative fuel vehicles over 14,000 lbs. GVWR operating in CaliforniaOut-of-state vehicles, public vehicles (federal, state, and local)

How are they regulated?

Phase 1 – Started January 2023 with high-emitter screening and testingPhase 2 – Starts in mid-2023 with reporting and compliance fee paymentsPhase 3 – Full implementation starts in 2024 with periodic compliance testing

What is it?

  • A new program similar to Smog Check but for heavy-duty vehicles

  • Clean Truck Check previously referred to as Heavy-Duty Inspection and Maintenance (HD I/M)

Who is regulated?

  • Diesel and alternative fuel vehicles over 14,000 lbs. GVWR operating in California

  • Out-of-state vehicles, public vehicles (federal, state, and local)

How are they regulated?

  • Phase 1 – Started January 2023 with high-emitter screening and testing

  • Phase 2 – Starts in mid-2023 with reporting and compliance fee payments

  • Phase 3 – Full implementation starts in 2024 with periodic compliance testing

Opacity Testing