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Other Rules

Engine Labeling

Diesel Emission Control Label (ECL) Inspection Program

Vehicles operating in California must have an Emission Control Label (ECL) demonstrating that the engine meets the required federal emission standards applicable for the engine's model year at the time of manufacture. Vehicles equipped with engines that do not meet these standards are prohibited from operating in California.

The ECL must be legible, maintained at the original location by the engine manufacturer, and correspond to the engine serial number stamped on the engine. See advisory regarding ECL requirements.

alert Engines that are missing their ECL are subject to civil penalties.

Several ARB diesel regulations require specific engine information, such as the engine model year (MY) and engine family name, which is available from the emission control label (ECL) that is attached to your vehicle.

Locating the Engine Control Label (ECL)

ARB Video

ECL Label Examples

photos• Various manufacturer's label examples - by ARB (photos)


Locating the Engine Family Name (EFN)

efn Download PDF

The Engine Family Name is a 10 to 12 character alpha-numeric code assigned by the engine manufacturer. You will find the EFN on the emission control label.  If your ECL is missing or illegible you should contact your local dealer or engine manufacturer to obtain engine family info and to order a replacement label. Be sure to have your engine serial number available.  If you have an engine’s displacement, manufacturer and model year, the Retrofit Device Verification Database may be useful to help determine the Family Name.

Locating the Gross Vehicle Weight Rating (GVWR)

The gross vehicle weight rating (GVWR) is assigned by the manufacturer and represents the maximum weight of the vehicle and what it can carry when fully loaded. The GVWR includes the weight of the vehicle itself plus fuel, passengers, cargo, and trailer tongue weight. It may sometimes be listed as gross weight. The GVWR is not the same as the unladed weight, gross combined weight rating, towing weight rating or registered weight rating. The manufacturer's original GVWR label is commonly found on the truck door jamb or on the inside of the door.

ARB Video


See CARB's Engine Labels FAQ webpage and the Regulatory Program Website for more information on this topic.


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