Title: Clean Truck Check Schedule: How Often Do You Need One? Meta Description: Learn the Clean Truck Check schedule and deadlines for heavy-duty diesel trucks in California. Stay compliant with APDCarb.
Staying Ahead of Your Schedule
One of the most important parts of Clean Truck Check compliance is knowing your testing schedule. Starting in 2024, California requires most diesel trucks to undergo semi-annual emissions testing to stay road-legal.
The schedule is not flexible — and missing a deadline can get expensive.
Standard Testing Frequency
- Twice per year: All heavy-duty vehicles over 14,000 lbs GVWR
- Based on the last digit of your VIN (CARB will notify based on VIN schedule)
- Fleets must maintain compliance records for each vehicle
Who Sets the Schedule?
CARB releases testing windows throughout the year. You’ll need to schedule a test before your assigned deadline to avoid violations.
Fleet Testing Deadlines
Fleet managers must coordinate tests across multiple vehicles. Missing one truck’s test can affect compliance for the whole operation. APDCarb offers bulk scheduling and digital reminders to help fleets stay current.
Consequences of Late Testing
- Missed deadlines trigger non-compliance notices
- CARB may impose fines or restrict operations
- DMV may hold registration renewals
Our Recommendation
Set reminders at least 30 days in advance of your testing month, and work with a mobile provider like APDCarb to avoid logistical headaches.
📞 Call to Action
Need help figuring out your testing schedule?
Call 619-567-9010 and we’ll walk you through it.
Or get on our free Clean Truck Check Reminder List at APDCarb.com