Is CARB Clean Truck Check (CTC) for Diesel Trucks over 14k lbs. going away?
CARB Clean Truck Check: What You Need to Know for 2013-2018 Diesel Vehicles
At NorcalCARBMobile.com, we’re committed to keeping California truck owners informed about the latest regulations. There’s been some buzz about whether the California Air Resources Board (CARB) Clean Truck Check program, also known as the Heavy-Duty Inspection and Maintenance (HD I/M) program, is going away for 2013-2018 diesel vehicles. Let’s clear the air: the Clean Truck Check is here to stay, and compliance is more critical than ever for your diesel trucks. Here’s the latest update as of July 17, 2025.
The Clean Truck Check Is Fully Enforced
Far from being phased out, the Clean Truck Check program is in full swing. As of October 1, 2024, new emissions testing requirements are in effect for heavy-duty diesel vehicles with a Gross Vehicle Weight Rating (GVWR) over 14,000 pounds operating on California roads, regardless of where they’re registered. For 2013 and newer model year diesel engines, this means biannual emissions compliance testing using a CARB-certified On-Board Diagnostics (OBD) testing device.
Starting January 1, 2025, non-compliance could lead to serious consequences, including:
DMV registration holds, preventing vehicle registration.
Fines of up to $10,000 per vehicle per day.
What About 2013-2018 Diesel Vehicles?
If you own a diesel truck from the 2013-2018 model years, the Clean Truck Check requirements apply to you. These vehicles must undergo OBD-based emissions testing twice a year. This program replaces the older Periodic Smoke Inspection Program (PSIP), so you no longer need smoke opacity tests for these model years—just the OBD test.
Looking ahead, the requirements will get stricter. Starting in October 2027, testing frequency for 2013 and newer vehicles will increase to four times per year. This signals CARB’s commitment to tightening emissions standards, not relaxing them.
Are There Any Exemptions?
There’s a limited exemption for vehicles with engines certified to the ultra-low NOx standard (0.010 g/bhp-hr), which are exempt from testing until January 1, 2027. However, as of June 1, 2024, no manufacturer has certified an engine to this standard, so this exemption doesn’t currently apply to most 2013-2018 diesel vehicles. Zero-emission vehicles are also exempt, but that’s unlikely to apply to your diesel fleet.
Why the Confusion?
Rumors about the Clean Truck Check “going away” might stem from the transition from PSIP to the new HD I/M program or misunderstandings about specific exemptions. Rest assured, the program is active, with roadside emissions monitoring and annual compliance fees (currently $30-$60 per vehicle) in place to ensure adherence.
How NorcalCARBMobile.com Can Help
At NorcalCARBMobile.com, we make compliance easy. Our mobile testing services bring CARB-certified OBD testing directly to you, saving you time and ensuring your 2013-2018 diesel vehicles meet Clean Truck Check standards. Avoid costly fines and registration issues by scheduling your biannual testing with us today.
Stay Informed
CARB continues to refine the Clean Truck Check program. To stay updated:
Sign up for CARB’s email alerts at arb.ca.gov.
Join CARB’s upcoming webinar on July 23, 2025, for the latest program details.
Contact CARB directly at hdim@arb.ca.gov or call their hotline at 916.890.4427.
Don’t let rumors mislead you—compliance is mandatory, and NorcalCARBMobile.com is here to keep your fleet on the road and in the clear. Schedule your Clean Truck Check today!
