A Class CM1 license lets you drive a motorhome or RV under 40,000 pounds gross vehicle weight rating (GVWR)

California's Class CM1 is a restricted commercial license designed specifically for people who want to operate a motorhome, recreational vehicle, or similar self-propelled vehicle for personal use. It sits between a regular Class C (non-commercial) license and a full Class B commercial license. You need a CM1 if your vehicle weighs 26,001 to 40,000 pounds GVWR and you are not using it for hire or commercial purposes.

The key word is personal use. If you own an RV and drive it yourself on vacation or to move between homes, a CM1 works. If you operate a motorhome as a business — renting it out, using it for commercial transport, or driving it for a company — you need a different class of commercial license and additional endorsements.

A Class CM1 does not allow you to tow a trailer, and it does not permit you to carry passengers for money. It is narrower than a Class B commercial license but does not require the same level of testing or medical certification as a full commercial license in all cases.

Key Takeaways

  • A Class CM1 covers motorhomes and RVs weighing 26,001 to 40,000 pounds GVWR for personal, non-commercial use only.
  • You must pass a written knowledge test, a behind-the-wheel driving test, and a vision test; a medical certificate may be required depending on your vehicle's weight.
  • If your motorhome weighs 26,000 pounds GVWR or less, you can drive it with a regular Class C license and do not need CM1.
  • A CM1 does not allow you to tow a trailer or carry passengers for hire, and it does not cover commercial or for-profit use.
  • You must be at least 18 years old and hold a valid California driver license before you can add a CM1 restriction.

When you need a Class CM1 versus a regular Class C license

The dividing line is your vehicle's gross vehicle weight rating, not what it actually weighs. GVWR is the maximum weight the manufacturer says the vehicle can safely carry, including fuel, cargo, and passengers. You can find it on a placard inside the driver's door jamb or in your owner's manual.

If your motorhome or RV has a GVWR of 26,000 pounds or less, you can legally drive it with a standard Class C license. No special endorsement or test is needed. Many smaller Class A and Class B motorhomes fall into this range.

If your GVWR is 26,001 to 40,000 pounds, you must have a Class CM1. If your GVWR exceeds 40,000 pounds, you need a Class B commercial license, which requires a commercial learner's permit (CLP), a medical certificate from the Department of Transportation (DOT), and additional testing.

Testing and licensing requirements for a Class CM1

To obtain a Class CM1, you must already hold a valid California driver license. You cannot get a CM1 as your first license. The process involves three main steps: a written knowledge test, a behind-the-wheel driving test, and a vision screening.

The written test covers motorhome-specific rules, vehicle control, cargo securement, and safe operation of large vehicles. You take this test at a California Department of Motor Vehicles (DMV) office. Study materials are available on the DMV website and in the California Driver Handbook. The test is typically 30 questions, and you must score at least 80 percent to pass.

The behind-the-wheel test is conducted by a DMV examiner and lasts about 30 to 45 minutes. You drive your actual motorhome or a similar vehicle provided by a third-party testing facility. The examiner watches how you handle acceleration, braking, turning, backing, and lane changes in a vehicle much larger than a standard car. You must demonstrate safe control and awareness of the vehicle's size and limitations.

A vision test is required at the DMV office. You must meet California's minimum vision standard of 20/40 in each eye with or without correction, and you must have at least 140 degrees of horizontal vision.

Whether you need a DOT medical certificate depends on your vehicle's GVWR. If it is 26,001 to 33,000 pounds, a medical certificate is not required by federal law, though California may have additional rules. If it exceeds 33,000 pounds, you must obtain a DOT medical certificate from a certified medical examiner before you can drive. This certificate confirms you meet federal health and vision standards for commercial vehicle operation.

How to add a Class CM1 to your existing license

You cannot obtain a CM1 as a standalone license — it must be added to an existing valid California driver license. The process begins at a DMV office or online through the DMV website if you are renewing your license at the same time.

First, gather your documents: your current driver license, proof of California residency (utility bill, lease, or bank statement), and your vehicle's registration or title showing the GVWR. If a medical certificate is required, bring the completed DOT Form 70 (Medical Examination Report for Commercial Driver License) signed by a certified medical examiner.

Visit a DMV office and request to add a Class CM1 restriction. You will pay a fee (the amount varies and should be confirmed at your local DMV office). You will then schedule your written test, vision test, and behind-the-wheel test. Some DMV offices allow you to take the written and vision tests on the same day; the driving test is usually scheduled separately.

Once you pass all three tests, the DMV will issue a new driver license with the CM1 restriction printed on it. This typically takes a few days to a few weeks depending on your local DMV's processing time.

What you can and cannot do with a Class CM1

A Class CM1 license permits you to operate a motorhome or RV for personal use only. You can drive your own motorhome on family vacations, move between residences, or use it for personal recreation. You cannot use it to generate income.

You cannot tow a trailer with a CM1 license, even a small one. If you need to tow, you must obtain a different class of license or endorsement.

You cannot carry passengers for hire or compensation. If you rent out your motorhome to others, you are operating a commercial vehicle and need a Class B commercial license with the appropriate endorsements, regardless of the vehicle's weight.

You cannot operate the vehicle for a business or employer, even if you are not charging passengers. If your job requires you to drive a motorhome — for example, as a mobile office or service vehicle — you need a commercial license.

You can drive the motorhome across state lines for personal use. Your California CM1 is recognized in other states, though you should check each state's specific rules about vehicle weight and licensing before you travel.

Insurance and registration with a Class CM1

A motorhome or RV with a GVWR over 26,000 pounds must be registered with the California Department of Motor Vehicles as a commercial vehicle, even if you hold a CM1 and use it only for personal purposes. This is a registration classification, not a license classification, and it affects your insurance and registration fees.

You must carry liability insurance that covers your motorhome. Many standard auto insurance policies do not cover RVs or motorhomes, or they cover them only up to a certain weight. You will need a separate RV or motorhome insurance policy. The insurer will ask for your driver license class and your vehicle's GVWR, so have both ready when you shop for quotes.

Registration fees for a motorhome or RV are typically higher than for a standard passenger vehicle and are based on the vehicle's weight and age. You can calculate an estimate on the DMV website before you register.

Downgrading from a Class CM1 or switching to a different license class

If you sell your motorhome or no longer need to drive a vehicle over 26,000 pounds GVWR, you can remove the CM1 restriction from your license. Visit a DMV office with your current driver license and request to remove the CM1. There is typically no fee for this change, and you can do it at any time.

If you want to upgrade to a Class B commercial license — for example, because you now operate a motorhome for hire — you must meet all the requirements for a Class B, including obtaining a commercial learner's permit, passing the written test, obtaining a DOT medical certificate, and passing the behind-the-wheel test. A Class CM1 does not count as credit toward a Class B; you must complete the full Class B process.

If you downgrade to a Class C only (removing the CM1), you can no longer legally operate any motorhome or RV with a GVWR over 26,000 pounds. Make sure you have sold or transferred the vehicle before you remove the restriction, or you will be driving illegally.

Frequently Asked Questions

Can I get a Class CM1 if I have never had a driver license before?

No. You must already hold a valid California driver license before you can add a CM1 restriction. If you are new to driving, you must first obtain a Class C license through the standard process, then later add the CM1 once you own a may have access to motorhome.

What is the difference between a Class CM1 and a Class B commercial license?

A Class CM1 is for personal use only and covers vehicles up to 40,000 pounds GVWR. A Class B commercial license allows you to operate vehicles for hire or commercial purposes and covers heavier vehicles. A Class B requires a medical certificate, a commercial learner's permit, and more extensive testing.

Do I need a Class CM1 if my motorhome weighs 26,000 pounds?

No. The threshold is 26,001 pounds GVWR. If your motorhome's GVWR is exactly 26,000 pounds or less, you can drive it with a regular Class C license. Check your vehicle's placard or owner's manual to confirm the exact GVWR.

Can I tow a trailer with a Class CM1?

No. A Class CM1 does not permit towing any trailer. If you need to tow, you must obtain a different license class or endorsement. Talk to the DMV about what class you would need based on your motorhome and trailer weights.

How long does it take to get a Class CM1 added to my license?

The written and vision tests can often be completed in one DMV visit. The behind-the-wheel test is usually scheduled separately and may take a few days to a few weeks depending on your local DMV's availability. Once you pass all tests, your new license is typically issued within a few days to a few weeks.