First Phase OBD Readiness Criteria Effective on August 1, 2024
Clean Truck Check (CTC) first-phase readiness criteria will require a minimum of Operation Since codes Cleared (OSC). If the vehicle’s test result does not meet that minimum, the vehicle result will be NOT READY and will not pass the OBD test.
This initial phase has a very low OSC threshold and will be increased over time to ensure the vehicle has had adequate operation for emissions monitors to complete their diagnostics checks.
This initial phase has a very low OSC threshold and will be increased over time to ensure the vehicle has had adequate operation for emissions monitors to complete their diagnostics checks.
Phase 1 Minimum OSC
- 3 Warm-Up Cycles (WUC)
- If the vehicle OBD system does not collect WUC, the CTC test will check for a minimum of 100 miles OSC.
- If neither WUC nor mileage are in the test record, the CTC test will check for a minimum of 200 minutes of OSC
Getting ready for the CTC OBD test
Things to do to have your best chance at passing the CTC OBD test:
- If your Malfunction Indicator Light (right) is on, get your vehicle repaired as soon as possible.
- Don’t wait - Do the OBD test early in the inspection compliance window so there will be time to complete the test if there are problems
- Avoid clearing codes. OBD systems require substantial vehicle operation to be able to complete their emission control diagnostic tests.
- A vehicle that has not been operated enough will fail the test.