CARB delays the beginning of Clean Truck Check testing and updates passing criteria
With little fanfare, CARB has moved the deadline for the beginning of the Clean Truck Check (CTC) onboard diagnostic (OBD) system testing and submissions from July this year to January in 2025.
This delay means owners who must do the testing in January 2025, can begin the testing and submitting the data on November 3, 2024 (the test and submission can be done up to 90 days before the submission deadline).
The due date of the OBD testing and submission is the last day of the month based on either:
- California-plated vehicles: The expiration date of their plate (for a California-plated vehicle, plates expiring in January and July will be due to do the testing and submission by the end of January), or
- Out-of-state vehicles: The last digit in the vehicle’s VIN (vehicles with a VIN ending in 3 and 9 will be required to do the testing and submission by the end of January).
The confusing part is that the 2024 registration fees were to be paid when the July to December 2024 test and submission was done. Based on the new Overview Fact Sheet-Clean Truck Check, even though the 2024 testing is not going to be required owners will still have to pay the 2024 fee in the month the test was supposed to have been done between July and December of 2024. The schedule and details can be found here: https://ww2.arb.ca.gov/clean-truck-check-requirements-vehicles-subject-semi-annual-periodic-compliance.
Test process and a change in passing criteria
The OBD test and submission must be done by a CARB-licensed tester. The tester must have completed the required training and have the necessary equipment. To conduct the test and submission on a vehicle with a 2013 or newer engine (vehicles with engines from MY 2012 or older must pass a smoke opacity test, rather than an OBD test), the licensed tester must connect a download device to the vehicle and a laptop that is logged into CARB’s system. The system will then verify that the vehicle’s emissions system is working within its designed parameters.
One of the indicators of a problem the test is looking for is an active malfunction indicator lamp (MIL). In the past, if the MIL was off, that portion of the test was passed.
The recent change is that not only will the vehicle fail if it is displaying an active MIL, but it will also fail if it has not done enough warm up cycles and hours or miles to verify that the issue has been fully resolved. The OBD does this to verify that the defect creating the MIL has been addressed, as opposed to someone just resetting the MIL by unplugging the battery or using a reset device immediately prior to the test.
Key to Remember: The test and submissions required under the Clean Truck Check program have been delayed until 2025, but the $30 per vehicle registration fees for 2024 must still be paid. Also, for an active MIL, the underlying issue must be repaired far enough in advance of the test that the OBD system can verify the defect has been corrected.