Clean Truck Check - Credentialed Testers & Testing Devices
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Important News
Posted March 10, 2026: Clean Truck Check program requirements are in effect for subject vehicles, including vehicles registered outside of California when operating in the state, to report, pay an annual vehicle compliance fee, and submit required passing emissions tests.
Becoming a Tester
- How to become a Clean Truck Check Credentialed Tester
- Tester Training Course, Exam, and Certification
- Testers Marketing Materials
- Clean Truck Check - Credentialed Tester Overview
- Credentialed Tester Account User Guide
- Tester Training and Examination FAQ
Troubleshooting Tests
- Test Results FAQ
- What to do when an ECL is Missing/Illegible
- Determining the Correct Test Type by Engine Year
- Vehicles of Interest (Field Issues)
- OBD Readiness Criteria
Testing devices & procedures
- OBD Test Devices
- OBD Background Information
- OBD Recommended Practices
- Vehicle Emissions Control Equipment Inspection Worksheet
- Submitting a NON-OBD Test
- SAE J1667-Smoke Meter Information