2026 Clean Truck Check deadline calendar
This calendar orients fleet planners to 2026 compliance rhythms. Your authoritative due date for each truck is always in CTC-VIS—not on this page. Confirm program-wide policy changes on arb.ca.gov.
How to find your due date in CTC-VIS
- Go to cleantruckcheck.arb.ca.gov and sign in
- Select the vehicle by VIN from your registered fleet list
- Review compliance status: fee payment, test type (OBD/opacity), and open testing window dates
- Schedule testing with a credentialed tester during the open window
- After inspection, return to CTC-VIS to confirm the pass is recorded
New to the portal? Follow our CTC-VIS registration guide.
2026 planning calendar
| Period | Milestone | What it means | Recommended action |
|---|---|---|---|
| Q1 2026 (Jan–Mar) | Annual cycle windows | Many registered VINs with Q1-assigned windows must complete testing during this period. Check each unit in CTC-VIS—do not assume all trucks share the same quarter. | Export CTC-VIS due dates; book credentialed testers 60+ days before window end. |
| Q2 2026 (Apr–Jun) | Peak spring testing season | Tester availability tightens as multiple fleet windows overlap. Mobile testers fill quickly near Central Valley harvest and port peak seasons. | Prioritize units with earliest window close dates; pre-screen for OBD dash lamps. |
| Q3 2026 (Jul–Sep) | Mid-year compliance review | Fleet managers should audit CTC-VIS for any VIN still showing non-compliant or fee-delinquent status before Q4 registration renewals. | Run compliance checklist; isolate failed units from revenue dispatch. |
| Q4 2026 (Oct–Dec) | Quarterly phase-in awareness | CARB continues phasing toward quarterly testing for many fleets, with broad implementation targeted around October 2027. Monitor arb.ca.gov announcements for frequency changes affecting your fleet category. | Read timeline guide; adjust 2027 budgets for potential 4× inspection frequency. |
| Ongoing | New VIN onboarding | Every newly acquired or newly California-operating diesel truck over 14,000 lbs GVWR should be registered in CTC-VIS promptly. Delayed registration does not delay compliance obligation. | Register within first week of California service; pay fees before first test booking. |
| After any test | Result verification window | Credentialed testers submit results electronically. Allow a short processing period, then confirm pass/fail status in CTC-VIS before dispatch. | If pass missing after several days, contact your tester to confirm CARB submission. |
Static calendar for planning purposes only. CARB may update phase-in schedules through rulemaking—verify on arb.ca.gov before committing fleet budgets or contractual delivery dates.
Missed a deadline?
Non-compliant status can trigger registration holds and enforcement. Book the earliest available credentialed tester on Zurfex and review penalties for non-compliance. See also due dates & testing windows and compliance timeline.