CTC Connection
Clean Truck Check Directory
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Clean Truck Check compliance basics

California’s Clean Truck Check (CTC) program replaced the previous Periodic Smoke Inspection Program (PSIP) and applies to most non-gasoline vehicles with a GVWR over 14,000 lb operating in California.

What fleets must do

  • Register every applicable vehicle in CARB’s Clean Truck Check system.
  • Pay the annual compliance fee per vehicle.
  • Submit emissions tests during the assigned compliance windows.

How tests get submitted

Submissions come from either a Certified Tester, the fleet itself (if credentialed), or an automated device like AIRPASS for OBD-eligible vehicles. Use this directory tofind a Certified Tester, or visit AIRPASS to automate it.

This directory is not affiliated with or endorsed by CARB. Certified Tester information is sourced from CARB’s public for-hire Certified Tester list when available; inclusion on that list is optional. Always confirm Certified Tester credentials, services, and availability before scheduling compliance testing.