CARB Clean Truck Rules & Emissions Compliance for Truckers

Why CARB Rules Matter for Every Trucker

California’s Air Resources Board (CARB) sets emission standards that apply to every diesel truck operating in the state — not just trucks registered in California. If you cross the state line, CARB rules apply to you. Noncompliance can result in fines starting at 1,000 dollars per day per vehicle, and CHP can impound noncompliant trucks at weigh stations.

The Truck and Bus Regulation (Current)

The existing Truck and Bus Regulation requires all diesel trucks operating in California to have engines meeting 2010 emission standards or newer. This applies to:

• All trucks with a GVWR over 14,000 lbs
• Both California-registered and out-of-state trucks
• Any truck that operates in California, even occasionally

Compliance check: Verify your engine model year meets 2010 standards. If your engine is older, it must have been retrofitted with a verified diesel emission control strategy (VDECS) or the truck cannot legally enter California.

Advanced Clean Fleets Rule (ACF)

The Advanced Clean Fleets rule, adopted in 2023, is the most aggressive zero-emission vehicle mandate in the country. It affects trucking in phases:

Drayage Trucks

High-Priority Fleets (50+ vehicles)

All Other Fleets

What This Means Now

If you are buying a new truck for California operations, you need to plan for the transition. Diesel trucks purchased today can still operate for their useful life, but the resale value of non-compliant trucks in California will decline as deadlines approach.

CARB Drayage Truck Registry

All trucks entering the ports of Los Angeles, Long Beach, and Oakland must be registered in the CARB Drayage Truck Registry. Registration requires:

1. Proof of compliance with current emission standards
2. Valid CARB-compliant engine (2010 or newer)
3. Annual registration renewal
4. Beginning 2024: new registrations must be zero-emission

Check your truck’s registry status at CARB’s TRUCRS portal.

SmogCheck and Periodic Smoke Inspection

California requires periodic smoke opacity testing for heavy-duty diesel vehicles. The Heavy-Duty Inspection and Maintenance (HD I/M) program requires:

• Annual compliance testing through OBD data submission
• Roadside opacity testing by CHP and CARB inspectors
• Fines for excessive opacity (visible smoke) starting at 300 dollars

Out-of-State Carriers: What You Must Know

If your truck is registered outside California but operates within the state, you must comply with:

1. Truck and Bus Regulation: 2010-or-newer engine required
2. CARB reporting: Register in the TRUCRS system
3. HD I/M program: Comply with inspection requirements when operating in-state
4. Idling restrictions: 5-minute maximum idling limit statewide

:::tip Verify your compliance before crossing the California border. CHP weigh stations use license plate readers and CARB databases to identify noncompliant trucks. Getting turned around at the border is better than getting fined inside the state. :::

California Idling Restrictions

California limits diesel truck idling to 5 minutes in any location. Sleeper berths must use shore power, battery HVAC, or a CARB-verified auxiliary power unit (APU). Fines start at 300 dollars per violation and escalate.

Alternatives to idling:

• Shore power (EITS): Available at some truck stops and all California port facilities
• Battery HVAC: Standalone battery-powered climate systems
• APU: Diesel-fired auxiliary power units (must be CARB-verified)

Insurance Implications

CARB compliance directly affects your insurance:

• A truck that cannot legally operate has diminished insurable value. If your truck is impounded for CARB noncompliance, physical damage coverage does not cover the compliance cost.
• Fleet transition planning affects your insurance portfolio. As you add ZEVs, coverage needs change — battery damage, charging infrastructure, and higher vehicle values require updated policies.
• Noncompliance fines are not covered by insurance. They are regulatory penalties, not insurable losses.

RMS works with carriers navigating the CARB transition to ensure coverage matches the fleet you actually operate. For California trucking insurance quotes, call (208) 800-0640.