CARB Compliance Guide
Everything California truck fleet operators need to know about staying compliant, avoiding fines, and keeping your trucks on the road.
What You Need to Know
Who It Applies To
Diesel trucks and buses with GVWR over 14,000 lbs operating in California — including out-of-state vehicles.
PM Filter Required
Trucks model year 2010 and newer must have a verified particulate matter (PM) filter installed and functioning.
TRUCRS Registration
All affected fleets must register in CARB's TRUCRS system and report compliance status annually.
Fines Up to $10,000
Non-compliant trucks face fines up to $10,000 per violation plus potential out-of-service orders at weigh stations.
Is Your Fleet Compliant?
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FAQ
What is the CARB Truck and Bus Regulation?
The California Air Resources Board (CARB) Truck and Bus Regulation requires most diesel trucks and buses with a gross vehicle weight rating (GVWR) over 14,000 lbs operating in California to meet specific particulate matter (PM) and NOx emission standards.
Does the regulation apply to out-of-state trucks?
Yes. Any diesel truck operating in California — regardless of where it is registered — must comply with the CARB Truck and Bus Regulation if it meets the weight threshold.
What is TRUCRS?
TRUCRS (Truck Regulation Upload, Compliance, and Reporting System) is CARB's online system for fleet operators to register their vehicles and report compliance. All affected fleets must be registered in TRUCRS.
What happens if my truck fails a CARB inspection?
Non-compliant trucks can be placed out-of-service by CHP officers at weigh stations or roadside inspections. Fines can reach $10,000 per violation. Continued non-compliance can result in additional penalties.
What is smoke opacity testing?
Smoke opacity testing measures the visible smoke (opacity) coming from a diesel engine's exhaust. California requires diesel vehicles to meet specific opacity limits. Our certified testers use approved equipment to measure and document your truck's exhaust opacity on-site.
How often do I need a CARB inspection?
Compliance reporting requirements vary based on fleet size and vehicle type. Most fleets are required to report annually through TRUCRS. We recommend scheduling an inspection before your reporting deadline to avoid last-minute issues.
Not Sure If You're Compliant?
Book a mobile inspection and we'll tell you exactly where you stand — same day documentation included.