What Happens If You Fail the CDL Permit Test?

If you fail the CDL permit test, you can retake it. The wait, the fee and the number of tries depend on your state, so you need three facts before you book again: your score against the pass line, the part you failed, and your state's retest rule. This page gives you a short checklist for the days after a fail and a way to decide when to rebook.

Do these five things in order after a fail

Do not rebook the same day. A rushed retest usually costs you another fee for the same result. Use this list instead.

1. Write down your score and the pass line. The pass line is explained in the next section.
2. Write down which part you failed. General Knowledge, Air Brakes, Combination Vehicles, or an endorsement test such as Hazmat or Tanker.
3. Ask the testing office for a list of missed topics. Some offices give a score report. Some do not. If yours does not, write down the topics you remember.
4. Look up your state's retest rule. You need the wait, the fee, and whether the retest needs a new appointment. Your state's CDL manual or licensing agency has the exact answer.
5. Pick your rebook date from your study time, not from your anger. The date comes last.

If you only copy one thing from this page, copy that list into your phone notes.

The federal pass line is 80 percent, and you can count your misses

The federal rule says you must answer at least 80 percent of the questions correctly to pass each CDL knowledge test. Your state may add its own rules, so check your state's CDL manual for anything higher.

Here is the math you can repeat with your own test. Take the number of questions on your test and multiply by 0.80. Round up. That is how many you must get right. Everything else is how many you can miss.

Example: these test sizes are for the math only. Your real question count is in your state manual, and our guide on how many questions are on the CDL test explains where to look.

Now compare your fail to the line. Say you missed the line by 2 questions. A review of the missed topics may be enough. Say you missed it by 10. Plan a full study block before the new date. That split is a rule of thumb, not an official rule.

Failing Air Brakes or Combination changes what permit you can get

Two parts matter more than the rest, because the federal rule treats them differently.

If you fail the Air Brakes part (under 80 percent) and a permit or license is still issued, it must show an air brake restriction. If you fail the Combination Vehicles part, a Group A permit or license must not be issued.

What to do with that:

• Going for Class A? Treat Combination Vehicles as the test to fix first. Read our Combination Vehicles guide for the topics.
• Failed Air Brakes? Ask your state agency what the restriction means for the jobs you want before you decide to live with it. Our Air Brakes guide covers what the test asks.
• Failed an endorsement test? Ask whether you retake only that test or more. States differ.

This is what the federal rule says. It is not legal advice, and your state agency has the final word on your permit.

Your state sets the wait, the fee and the retake limit

Retake timing depends on the state. Some states cap the number of retakes in a set time. Later attempts can bring longer waits or extra training in some states. Rules can also change, as in New Mexico's retesting update, so read the current rule and not an old forum post.

Kentucky is one example, not the rule everywhere. Kentucky lets you retest on the next day tests are given and charges a $50 retest fee when you apply. Another state can be slower or cheaper.

Ask the testing office these five questions. Use the words as written.

1. "How many days must I wait before I retest?"
2. "Is there a fee for each retest, and do I pay when I book?"
3. "Is there a limit on retests, or a longer wait after more fails?"
4. "If I failed an endorsement test, do I retake only that test?"
5. "Does my permit application time run out before I can retest?"

Write the answers down. Do not plan around a rule you heard from a driver in another state.

Each fail costs more than the fee

Add up what one attempt really costs you.

Example: say the retest fee is $50 and a day off work costs you $120. One fail costs $170 before you study again. Three attempts cost $510. Use your own state's fee and your own day rate.

That is why the wait is useful. It is the cheapest study time you will get before the next fee. For the real fee in your state, see our table of CDL permit cost by state.

Spend the waiting days on missed topics first

Count your study days: the earliest date you can retake, minus today. Then split them.

• About two thirds on missed topics. Re-read only those manual sections, then drill the questions you got wrong.
• About one third on timed practice. Do a full-length test under the time limit in the last few days.

Do not re-read the whole manual. You already know most of it, and that time does not move your score.

Drill the misses again after 1 day, 3 days and 7 days. A missed question you can answer three times in a row is fixed. A missed question you only recognize is not.

Re-read the answer, not just the choice. Many wrong answers on this test look right but leave something out. Read the full sentence to the end before you pick.

Rebook when your practice scores clear the line twice

Use this rule: book the retest when two timed practice tests in a row land above the 80 percent line, and your earlier weak topics are no longer the ones you miss. One good score can be luck. Two in a row is a pattern.

If you are not there when your state's earliest date arrives, you do not have to take that date. Book a later one if your state allows it. Check whether your state charges to move an appointment.

Our 9-point readiness checklist walks through the same call with more detail.

Do this in the next ten minutes

Open your state's CDL manual or licensing page. Find the retest section. Write the wait, the fee and the retake limit in your phone notes next to your score and the part you failed.

Find your weak topics before you pay for another try

The free diagnostic takes about 10 minutes, needs no account, and shows a predicted score and your weak spots, so you know what to study before you book. If you later buy the full program, the Pass Promise keeps your access free until you pass and adds a new targeted plan. It is not a cash refund and it does not cover retest fees.

Take the free diagnostic