Where do I find my Clean Truck Check due date?

Log in to CTC-VIS with your vehicle registered. The portal displays each unit’s compliance status and assigned testing window. CARB also publishes program-wide phase-in timelines on arb.ca.gov.

Can I test early before my window opens?

Testing too far outside your assigned window may not count toward compliance. Schedule within the window shown in CTC-VIS or confirm with your credentialed tester and CARB guidance if you need an exception.

What happens if I miss my deadline?

Missed deadlines can lead to non-compliant status, DMV registration blocks, and enforcement action. See our penalties guide and book a test as soon as possible if you are past due.

Clean Truck Check deadlines & due dates

Missing a Clean Truck Check due date is one of the fastest ways to lose operating flexibility in California. CARB assigns testing windows in CTC-VIS; your job is to complete the required inspection—and any retests—before that window closes.

How testing windows work

After you register a vehicle and pay state compliance fees, CTC-VIS assigns a compliance cycle. Most operators today see annual testing requirements, but CARB has announced a path toward more frequent testing for many fleets—see our testing frequency guide for the latest phase-in context.

Each cycle includes an open testing window—typically a multi-month period during which you must obtain a passing result from a credentialed tester. Waiting until the last week invites risk: tester availability tightens near deadline clusters, and failed units need repair time you may not have.

Official calendar rules and any grace-period policies are defined by CARB on arb.ca.gov. Do not rely on forum posts or outdated PDFs when planning fleet downtime.

Planning ahead for fleets

Spread testing across the window instead of batching every unit in the final month. Prioritize tractors with the nearest due dates, units approaching DMV registration renewal, and trucks showing maintenance lights that could fail an OBD inspection.

Zurfex lets you search testers by ZIP and schedule mobile visits at yards—useful when pulling ten tractors off the road at once is impractical. For larger operations, explore bulk fleet scheduling and deadline planning resources.

Build a recurring calendar reminder 60 and 30 days before each VIN’s window closes. Pair it with a weekly CTC-VIS status review so newly added trucks do not slip through onboarding.

After a failed test

A failure does not pause the clock indefinitely. CARB rules define how long you have to repair and retest. Treat a fail like a production outage—diagnose DPF, SCR, EGR, or opacity-related issues immediately and rebook a credentialed tester.