CDL Restriction Codes 2026: The Complete List & How to Remove Them
You passed your CDL test, got your license in the mail, and there it is: a string of letters printed right on the front that you did not ask for. CDL restriction codes are the fine print that nobody explains to you until it is too late. They sit on your license and silently limit what you can drive, which jobs you qualify for, and how much money you can make.
Understanding CDL restriction codes is not optional. If you apply for a job that requires air brakes and you have an L restriction, your application goes in the trash. If a company needs a driver who can operate a manual transmission and you have an E restriction, you are not getting the call.
This 2026 guide covers every major CDL restriction code, what it means, how it gets on your license, and the exact steps to remove it.
1. Why CDL Restriction Codes Exist
The FMCSA uses CDL restriction codes to indicate that a driver is missing a specific skill or has not completed a specific test. They are not punishments. They are safety markers. The restriction tells employers and law enforcement that you have not been tested or qualified in a particular area.
The problem is that many new drivers do not realize they have restrictions until they try to get a job. If you tested in an automatic truck, you get an E restriction automatically. If you skipped the Air Brakes test, you get an L. These are not red flags on your record, but they close doors.
2. The L Restriction: No Air Brakes
The L restriction is the most common and the most damaging CDL restriction code on your license.
What It Means
You are prohibited from operating any commercial vehicle equipped with air brakes. Since almost all Class A tractor-trailers and most large Class B vehicles use air brakes, this restriction effectively limits you to smaller vehicles with hydraulic brakes.
How It Gets on Your License
- You did not take or did not pass the Air Brakes knowledge test
- You did not demonstrate air brake components during the pre-trip inspection
- You tested in a vehicle without air brakes
Impact on Employment
The L restriction is a job killer for Class A drivers. Virtually every semi-truck on the road uses air brakes. With an L restriction, you cannot legally drive a standard 18-wheeler. Some straight trucks and box trucks use hydraulic brakes, but the job market shrinks dramatically.
How to Remove the L Restriction
- Study for the Air Brakes knowledge test (25 questions, need 80% to pass)
- Pass the knowledge test at the DMV
- Retake the pre-trip inspection portion of the skills test using a vehicle equipped with air brakes
- The DMV removes the L restriction and issues an updated CDL
The L restriction prohibits you from operating any commercial vehicle equipped with full air brakes. This is one of the most limiting **CDL restriction codes** because nearly all Class A tractor-trailers and most large Class B vehicles use air brake systems. Without air brake qualification, your job options narrow significantly.
3. The E Restriction: Automatic Transmission Only
The E restriction is increasingly common as more CDL schools train students in automatic trucks.
What It Means
You are restricted to operating commercial vehicles with automatic transmissions only. You cannot legally drive a CDL vehicle with a manual transmission.
How It Gets on Your License
You took the CDL skills test in a vehicle equipped with an automatic transmission. This is not a choice the examiner makes. It is automatic (pun intended). The restriction is applied based on the vehicle you tested in.
Impact on Employment
Many newer fleet trucks are automatic, so the E restriction is less damaging than it used to be. However, some companies still run manual transmissions, especially in vocational and older fleet vehicles. Owner-operators buying used trucks may encounter manual transmissions as well. The E restriction closes some doors but not all of them.
How to Remove the E Restriction
- Train in a vehicle with a manual transmission
- Retake the CDL skills test (all three parts) in a manual transmission vehicle
- Demonstrate proper shifting, double-clutching, and gear selection
- The DMV removes the E restriction from your license
Yes, you have to retake the entire skills test, not just the driving portion. This makes removing the E restriction one of the more involved processes among CDL restriction codes.
4. The O Restriction: No Tractor-Trailer
The O restriction prevents you from operating a tractor-trailer combination. This is relevant for drivers who hold a Class A CDL but did not test in a full combination vehicle.
What It Means
You cannot operate a Class A combination vehicle (tractor-trailer). You are limited to straight trucks and other non-combination vehicles within your CDL class.
How It Gets on Your License
You tested for your Class A CDL using a truck that was not a full tractor-trailer combination. Some CDL schools use power units with smaller trailers or test vehicles that do not meet the full combination vehicle definition.
How to Remove the O Restriction
- Train in a full tractor-trailer combination
- Retake the skills test in a proper combination vehicle
- Demonstrate coupling, uncoupling, and combination vehicle operation
- The DMV removes the O restriction
5. The M Restriction: Class B to Class A Limitation
The M restriction is one of the more confusing CDL restriction codes because it sounds backwards.
What It Means
If you have a Class B CDL and passed the Class A written tests but did not complete the Class A skills test in a Class A vehicle, the M restriction is applied. It means you cannot operate a Class A vehicle even though you passed the Class A knowledge tests.
How It Gets on Your License
You hold a Class B CDL, passed the Class A knowledge tests (including Combination Vehicles), but took the skills test in a Class B vehicle instead of a Class A combination vehicle.
How to Remove the M Restriction
- Complete behind-the-wheel training in a Class A combination vehicle
- Pass the Class A skills test in a Class A vehicle
- Your CDL is upgraded from Class B to Class A, and the M restriction is removed
The E restriction is automatically applied when you take the CDL skills test in a vehicle with an automatic transmission. Among **CDL restriction codes**, this one is the most silently applied. Many drivers do not realize they have it until they apply for a job that requires manual transmission proficiency.
6. The P Restriction: No Passengers (CDL Permit Holders)
The P restriction applies specifically to Commercial Learner's Permit (CLP) holders, not to fully licensed CDL drivers.
What It Means
While operating under a CLP, you cannot carry passengers other than the supervising CDL holder who is sitting in the front seat next to you.
How It Gets on Your Permit
The P restriction is automatically placed on all Commercial Learner's Permits. It is a standard safety restriction that applies nationwide.
How It Goes Away
The P restriction is removed when you upgrade from a CLP to a full CDL by passing the skills test. It is not something you actively remove. It simply disappears when you earn your full license.
7. Other Less Common CDL Restriction Codes
K Restriction: Intrastate Only
You are restricted to operating commercial vehicles within your state of residence. This usually applies to drivers under 21 (who cannot drive interstate) or drivers who qualified under state-specific medical waivers rather than federal DOT medical standards.
V Restriction: Medical Variance
You have a medical variance on file with the FMCSA (such as a vision or diabetes exemption). The restriction indicates that your medical qualification has specific conditions.
Z Restriction: No Full Air Brakes (Air Over Hydraulic)
Similar to the L restriction but specifically for vehicles with air-over-hydraulic brake systems. You did not test on full air brakes, but you did test on a partial air system.
G Restriction: Limited to Vehicles with Specific Equipment
Applied when testing conditions or vehicle configurations do not meet the full standard for unrestricted operation.
8. Complete Restriction Code Reference Table
| Code | Restriction | Impact | Removal |
|---|---|---|---|
| L | No air brakes | Cannot drive most Class A trucks | Pass Air Brakes test + pre-trip |
| E | Automatic only | Cannot drive manual trucks | Retake skills test in manual |
| O | No tractor-trailer | Cannot drive Class A combos | Retake test in combo vehicle |
| M | Class B limited | Cannot drive Class A | Pass Class A skills test |
| P | No passengers | CLP holders only | Earn full CDL |
| K | Intrastate only | Cannot cross state lines | Meet federal medical requirements |
| V | Medical variance | Conditional medical clearance | Varies by condition |
| Z | No full air brakes | Air-over-hydraulic only | Test on full air brake vehicle |
The O restriction specifically prevents you from operating a tractor-trailer (Class A combination vehicle). This is different from the L restriction, which blocks air brakes, and the E restriction, which limits you to automatic transmissions. Among **CDL restriction codes**, the O restriction is the one that directly blocks Class A combination driving.
9. How Restriction Codes Affect Your Pay
CDL restriction codes directly impact your earning potential. Here is the practical breakdown:
- No restrictions: You can apply for any CDL job. Maximum earning potential.
- L restriction only: You are limited to hydraulic brake vehicles, typically smaller Class B jobs. Salary range: $35,000 to $55,000.
- E restriction only: You can drive any automatic truck, which covers most modern fleet vehicles. Salary range: $50,000 to $85,000. Some smaller companies with older trucks will not hire you.
- L + E restrictions combined: You are very limited. Small automatic trucks only. Salary range: $30,000 to $45,000.
- O restriction: You cannot drive Class A combos. If you have a Class A CDL with an O restriction, you are effectively limited to Class B-style jobs.
The lesson is clear: remove as many CDL restriction codes as possible before you start applying for jobs. The cost of a few extra days of testing is nothing compared to years of limited earning potential.
To remove the L restriction, you must pass the Air Brakes knowledge test (25 questions, 80% passing score) and retake the pre-trip inspection using a vehicle equipped with air brakes. There is no time-based expiration for **CDL restriction codes**. They stay on your license until you actively remove them through testing.
Air Brakes (L)
Memorize critical PSI numbers and the 3-step L.A.B. check process.
Conclusion
CDL restriction codes are not just letters on a card. They are barriers between you and the jobs you want. The L, E, O, and M restrictions are the most common and the most damaging to your career prospects. The good news is that every single one of them can be removed through additional testing and training.
Before you schedule your CDL skills test, make sure you are testing in the right vehicle. Use a manual transmission if possible to avoid the E restriction. Test in a vehicle with full air brakes to avoid the L restriction. Test in a full Class A combination vehicle to avoid the O restriction. Getting it right the first time saves you weeks of retesting later.
For exam preparation, start with our Free CDL Practice Test. To understand license classes better, see our CDL License Classes Explained guide. For air brake study material, check out our CDL Air Brake Test Questions and Answers.
Frequently Asked Questions (FAQ)
What does the L restriction mean on a CDL?
The L restriction means you are prohibited from operating a commercial vehicle equipped with air brakes. It is applied when you do not pass the Air Brakes knowledge test or do not demonstrate air brake components during the pre-trip inspection. Since most Class A trucks use air brakes, the L restriction is one of the most limiting CDL restriction codes you can have.
What does the E restriction mean on a CDL?
The E restriction limits you to operating commercial vehicles with automatic transmissions only. It is applied automatically when you take the CDL skills test in a vehicle with an automatic transmission. You cannot drive a manual transmission truck until you retake the skills test in a manual vehicle.
What does the O restriction mean on a CDL?
The O restriction prevents you from operating a tractor-trailer combination. It is applied when you earn a Class A CDL but did not test in a full tractor-trailer combination vehicle. To remove it, you must retake the skills test in a proper Class A combination vehicle.
How do I remove the L restriction from my CDL?
To remove the L restriction, pass the Air Brakes knowledge test (25 questions, 80% required) and retake the pre-trip inspection portion of the skills test using a vehicle equipped with air brakes. The DMV will then issue an updated CDL without the L restriction.
What is the M restriction on a CDL?
The M restriction appears on a Class B CDL when the driver passed the Class A knowledge tests but did not complete the Class A skills test in a Class A vehicle. It means the driver cannot operate Class A vehicles despite passing the written exams. Removal requires passing the Class A skills test in a proper combination vehicle.
Can CDL restriction codes be removed?
Yes. All CDL restriction codes can be removed by completing the specific testing or training requirements for each code. The L restriction requires the Air Brakes test. The E restriction requires retaking the skills test in a manual vehicle. The O restriction requires testing in a full combination vehicle. None of them are permanent.
Explore More Practice Tests
General Knowledge
The #1 starting point. Covers vehicle inspections & basic road safety rules.
HazMat (H)
Master the placarding tables, shipping papers, and TSA requirements.
Air Brakes (L)
Memorize critical PSI numbers and the 3-step L.A.B. check process.
Combination
Learn the 5-step coupling checklist and rollover prevention techniques.
Pass Your CDL Exam First Try
Don't guess. Practice with 1000+ real exam questions updated for 2026.
Start Free Practice
