Out-of-state motorhomes driven for recreational travel are officially exempt from California's Clean Truck Check regulation, the California Air Resources Board (CARB) and the RV Industry Association (RVIA) confirmed. While the state's heavy-duty emissions program enforces testing, reporting, and fees on out-of-state commercial freight trucks entering California, visiting RV owners do not need entry permits, fees, or smog certificates.
What the Exemption Means for Visiting RVers
Online rumors prompted confusion after California launched enforcement for its Clean Truck Check, formally known as the Heavy-Duty Inspection and Maintenance regulation. The program covers almost all non-gasoline vehicles with a Gross Vehicle Weight Rating (GVWR) over 14,000 pounds operating on California highways—a threshold that includes many heavy-duty diesel motorhomes as well as out-of-state freight trucks and buses.
However, RVIA verified directly with CARB that "Motorhomes registered outside of California" are officially categorized on the agency's exempt list. As long as the motorhome is registered non-commercially in another state or jurisdiction and used solely for recreational travel, out-of-state owners can cross into California without registering in state databases or scheduling emissions tests.
Rules for California-Registered Diesel Motorhomes
The exemption does not apply to California residents. Owners of diesel and alternative-fuel motorhomes rated over 14,000 pounds GVWR that are registered in California must fully comply with state rules.
To keep their registration valid, California owners must:
- Create an account and register the vehicle in the state's online Clean Truck Check Vehicle Inspection System (CTC-VIS).
- Pay the annual compliance fee, which rose to $32.13 per vehicle for 2026 to track changes in the California Consumer Price Index.
- Pass an annual emissions test and submit the passing result within 90 days before their annual Department of Motor Vehicles (DMV) registration renewal deadline.
Failing to submit passing test results or pay the required fee will trigger a DMV registration hold on the motorhome.
How Motorhomes Differ from Commercial Freight Trucks
California gives non-commercial motorhomes a simpler schedule than commercial fleets. In-state motorhomes must undergo emissions testing once a year to match their DMV renewal cycle. By comparison, commercial diesel trucks currently undergo emissions testing twice a year, shifting up to quarterly testing for vehicles equipped with On-Board Diagnostics starting in late 2027.
Gasoline-powered motorhomes, regardless of whether they are registered in California or out of state, are entirely exempt from the Clean Truck Check regulation, which targets only diesel and alternative-fuel powertrains.