Resources

Clean Truck Check, explained.

Free, vendor-neutral guides to help diesel owners and fleets pass their CARB Clean Truck Check tests — and avoid surprises at the deadline.

Drive cycle guide

Step-by-step process to complete a heavy-duty diesel drive cycle so readiness monitors set before your test.

What each monitor means, why they show 'incomplete,' and how to set them.

Pre-appointment checklist for OBD and smoke opacity testing.

Submission windows, due dates, and what triggers a non-compliance fee.

Scaling Clean Truck Check across multiple vehicles, drivers, and yards.

Common questions about who is covered, fees, exemptions, and rechecks.