Here’s what Clean Truck Check looks like in 2026: who has to test, how often, and how to stay ahead of your deadlines.
Who has to test?
Diesel and alternative-fuel vehicles over 14,000 lbs GVWR that drive in California. That includes box trucks, work trucks, dump trucks, buses, and motorhomes. Out-of-state trucks count too, if they drive here.
How often?
- Most vehicles: twice a year.
- California-registered motorhomes and farm vehicles: once a year.
- Coming in late 2027: trucks with OBDII (diesel 2013+) move to four times a year.
You can submit a passing test up to 90 days before your deadline. Testing early gives you time to fix anything that comes up.
The annual fee
CARB charges a small yearly compliance fee for each vehicle, paid in your CTC-VIS account. The amount is updated every January, and CTC-VIS always shows the current fee.
Which test?
- Diesel 2013 and newer: OBDII scan
- Diesel 2012 and older: smoke opacity test plus visual inspection
Got a Notice to Submit?
That letter means CARB wants a passing test within 30 days. Text us right away and we’ll try to fit you in fast.
What happens if I miss a deadline?
CARB can block your DMV registration and issue fines. It’s much easier to test on time.
How we help
We’re CARB-credentialed testers. We come to your yard or you come to us, and we submit your results to CARB for you. Most tests take well under an hour.
Official links
Got trucks that need testing?
Pick a few days that work and we'll come to your yard. Local visits are free.
Or call 626-551-4555