Registering Commercial Vehicles and Trailers in California in 2026: Weight, CVRA, PTI and the Diesel Check

Which vehicles register as commercial

Commercial vehicles designed, used or maintained primarily to transport property or people for hire, compensation or profit must be registered as such, per the DMV's commercial vehicle registration page, and the DMV's vehicle definitions page cites Vehicle Code section 260 for the definition. Commercial motor vehicles with a gross vehicle weight or combined gross vehicle weight of 10,001 pounds or more, along with most trailers, register as commercial vehicles. The DMV's categories: buses when they carry people for hire; motor trucks designed, used or maintained primarily to carry property; pickups, which it defines as a commercially used motor truck with a manufacturer's gross vehicle weight rating under 11,500 pounds, an unladen weight under 8,001 pounds and an open box bed under nine feet; tow trucks; truck tractors built to draw other vehicles; water-well drilling rigs other than agricultural and oversize rigs, which are exempt; and yard trucks that move trailers within freight yards. Multipurpose vehicles, passenger vehicles, pickups and station wagons can be registered as passenger or commercial depending on their use.

The DMV also lists what is not a commercial vehicle for registration: vanpool vehicles, other than motor trucks and truck tractors, that carry more than 10 but not more than 15 people including the driver for nonprofit work-related ridesharing; passenger vehicles not used to carry people for hire; housecars and motorhomes; trailer coaches, which may carry property but are designed primarily for habitation; military equipment operated by non-civilian personnel and owned or operated by the Department of Defense including the National Guard; and implements of husbandry operated by someone not required to hold a driver license.

The application and the declared weight

A commercial vehicle is registered with an Application for Title or Registration (REG 343); a Declaration of Gross Vehicle Weight/Combined Gross Vehicle Weight (REG 4008), which the DMV requires from owners of commercial motor vehicles with an unladen weight of 6,001 pounds or more but less than 10,001 pounds, except pickups, to declare the maximum operating weight with a load; a Verification of Vehicle (REG 31); a Statement of Facts (REG 256) where it applies; the titling documents; and the fees. Declared GVW is the unladen weight plus the heaviest load the vehicle will carry, for a vehicle that hauls but does not pull; declared CGW is the unladen weight of the combination plus the heaviest load it will carry, for a vehicle that pulls another, and the DMV's example is a truck loaded with produce pulling a trailer loaded with bricks, which declares the CGW of the whole. Owners and lessees declare the weight when the vehicle is first registered in California, when it is bought new or used, and whenever the operating weight changes. A weight registered under partial year registration does not have to be declared at each renewal unless it changes.

Weight fees, CVRA fees and the decals

For commercial motor vehicles of 6,001 pounds or more the fees are based on the unladen weight, the declared GVW or the declared CGW, with a weight fee table on the DMV's site. Vehicles of 10,001 pounds or more are assessed Commercial Vehicle Registration Act of 2001 fees instead of weight fees and remain subject to the registration fee, the vehicle license fee and any city or county fees. The DMV's registration fees page lists the CVRA lines:

A CVRA vehicle displays CVRA weight decals and year stickers on both its right and left sides; the year sticker matches the color of the plate sticker, and the weight decal shows the highest GVW or CGW at which the vehicle may operate. The DMV's example: a vehicle operating at 42,000 pounds shows 45, for 45,000 pounds, on the decal and the registration card, and a 54 decal is valid up to 54,999 pounds. The weight decals are issued once with the year stickers; later renewals bring only year stickers unless the operating weight changes or replacement decals are requested. When the declared weight increases after it was reported, an additional CVRA fee is due on the higher range for the rest of the registration year or partial year period and must be paid before the vehicle operates at the higher weight; a decrease is added to the record with a new registration card and no refund. The DMV refers to its Vehicle Industry Registration Procedures Handbook for exemptions, exclusions and penalties, and the late penalties on every registration are on the California DMV fees page.

Trailers: permanent trailer identification

All trailers register under the permanent trailer identification program except park trailers and trailer coaches, which are excluded and register annually; the DMV's definitions page lists semi-trailers, boat trailers, utility, flat bed, box and horse trailers as PTI trailers under Vehicle Code section 468. Fifth-wheel and camp trailers register as a trailer coach or a camp trailer under PTI depending on length, width and size. Tow and auxiliary dollies need no California registration, though the DMV says an owner may choose PTI, and should consider it when the dolly will be towed out of state since other states' rules vary; a dolly not registered as PTI surrenders any existing plate. A permanent trailer registers with its titling documents, which can be an out-of-state title, an Application for Registration of New Vehicle (REG 397) or a manufacturer's statement of origin; without a REG 397 the DMV also wants a REG 343 and a REG 31; plus a REG 256 declaring the unladen weight with no weight certificate, a Permanent Trailer Identification Application and Certification (REG 4017) when there is no legal owner and the owner wants a paper title, and the fees. Without a title application the DMV issues only a PTI card and keeps an electronic ownership record.

A PTI service fee notice arrives about 60 days before the expiration, and the DMV sends a notice of acknowledgment on payment but no new sticker. At the original PTI registration the owner keeps an existing California trailer plate and receives a PTI sticker, or takes a PTI plate with no sticker; personalized and special interest plates may be kept or requested, with their fees added at renewal.

The diesel emission check

Since January 1, 2020 the DMV verifies with the California Air Resources Board that a diesel vehicle complies with, or is exempt from, CARB's Truck and Bus Regulation before registering it. Diesel vehicles with a manufacturer's gross vehicle weight rating over 14,000 pounds must comply, and the DMV phased the check in by model year on two schedules:

If CARB reports a vehicle as non-compliant, the DMV cannot register it or transfer its ownership; Senate Bill 1 of 2017 (Beall, Chapter 5) requires the denial. CARB publishes compliance guidance and the exemptions on its Truck Stop site, and once CARB updates the vehicle's record with the DMV the registration can proceed. CARB's Diesel Hotline is 1-866-634-3735.

Fleets, partial years and interstate trucks

The owner of a fleet of commercial or passenger vehicles may apply for permanent fleet registration on an Application for Permanent Fleet Registration (REG 3500), agreeing to the program's requirements to receive a PFR account number. PFR vehicles carry a permanent fleet sticker on the plate and a permanent registration card instead of yearly stickers; a renewal listing goes out monthly for the vehicles that expire that month; and CVRA vehicles in a fleet get gold weight decals and year stickers with PFR printed in black, reissued only for a weight change or damage. A commercial vehicle that will not be used throughout a calendar year can take partial year registration, $28 on the schedule. A commercial vehicle used in two or more states can register under the International Registration Plan, which the DMV describes as a single plate and cab card issued by the base jurisdiction with fees apportioned by the share of highway miles traveled in each jurisdiction.

Alterations, body changes and auto to commercial plates

Alterations or additions to a registered used commercial vehicle that move it into a different weight classification must be reported to the DMV. Additional weight fees are due from the date of first operation after the change when the vehicle moves up a class, and the DMV says no refund of weight fees is given when it moves down. A change to the body or use of a vehicle that requires commercial registration requires commercial plates: the DMV names pickups with a permanently attached camper (body type code PM), station wagons and passenger-type vehicles carrying persons for hire as the vehicles that may carry either auto or commercial plates. The switch from commercial to auto plates, with its fees, is on the DMV's commercial to standard plates page and in the license plates guide. A vehicle altered by $2,000 or more, or into a different weight class, is reported under the rules on the kit and altered vehicles guide.

Questions about commercial vehicles in California

Which vehicles must register as commercial?

Vehicles designed, used or maintained primarily to transport property or people for hire, compensation or profit, per the DMV; motor vehicles with a gross vehicle weight or combined gross vehicle weight of 10,001 pounds or more, and most trailers, register as commercial vehicles.

What are declared GVW and CGW?

Declared gross vehicle weight is the unladen weight of a vehicle plus the heaviest load it will carry, for a vehicle that hauls a load but pulls nothing. Declared combined gross vehicle weight is the unladen weight of the combination, motor vehicle and trailer, plus the heaviest load the combination will carry, for a vehicle that pulls another. The DMV collects it on the REG 4008.

What does CVRA cost?

The DMV's fee schedule lists the Commercial Vehicle Registration Act fee at $122 for a motor vehicle, $3 for the weight and year stickers, and a $56 CHP fee for CVRA vehicles; vehicles of 10,001 pounds or more pay CVRA fees instead of weight fees but still owe the registration fee, the vehicle license fee and any city or county fees.

How are trailers registered?

Under the permanent trailer identification program, except park trailers and trailer coaches, which register annually. The PTI original fee is $20 and the service fee $10 every five years on the DMV schedule; no sticker is issued at renewal.

My diesel truck will not register. Why?

If the California Air Resources Board reports to the DMV that a diesel vehicle with a manufacturer's gross vehicle weight rating over 14,000 pounds does not comply with the Truck and Bus Regulation, the DMV cannot register it or transfer it, under Senate Bill 1 of 2017; CARB's Truck Stop site and its Diesel Hotline at 1-866-634-3735 handle compliance.

What if I raise the operating weight after registering?

An additional CVRA fee is due on the higher weight range for the rest of the registration year or partial year period, and the DMV says it must be paid before the vehicle operates at the higher weight; a decrease is recorded with a new card but brings no refund.

Can I use the truck in only part of the year?

Yes, through partial year registration, $28 on the schedule, for a commercial vehicle that will not be used throughout a calendar year.