CARB Clean Truck Check Deadlines 2025-2026: What Northern California Truckers Need to Know
The basics: why deadlines matter
The CARB Clean Truck Check program requires periodic emissions testing for most heavy-duty diesel vehicles in California. When you miss your testing deadline, CARB notifies the DMV and a hold is placed on your vehicle registration. You cannot renew registration or legally operate the vehicle on California public roads until compliance is confirmed.
How testing frequency is determined
Your required testing frequency depends on several factors including your vehicle’s model year, engine model year, compliance history, and whether the vehicle has previously failed testing.
The general framework under the HD I/M program requires vehicles to test periodically, annually or more frequently depending on the vehicle category. CARB has been phasing in stricter testing requirements as the program matures, and deadlines have become increasingly important to track.
For the most current and vehicle-specific deadline information, register your vehicle in the CARB Clean Truck Check portal at cleantruckcheck.arb.ca.gov. The portal will show your specific compliance status and upcoming deadlines.
What to do before your deadline
Do not wait until you receive a DMV hold notice to schedule testing. The best approach is to schedule your test at least 2 to 4 weeks before your deadline to allow time for any repairs if your vehicle fails the initial test.
For Sacramento and Northern California operators, mobile testing is the fastest and most convenient option. We can typically schedule same-day or next-day appointments, and OBD test results upload immediately so there’s no waiting period for your compliance status to update.
Upcoming changes to watch
CARB has signaled that testing frequency requirements will increase in coming years, with quarterly testing requirements expected to begin phasing in for certain vehicle categories starting in 2027. Staying ahead of these changes means working with a tester who monitors regulatory updates, which we do.
Need help understanding your deadline? Call us at (916) 538-7777.