Failed the CDL permit test? What happens next
Most people who fail miss by two or three questions. The waiting time and fees by state, whether your passed tests still count, and how to fix the gap before the retake.
Failing a CDL knowledge test is common and it costs you time, not your chances. Most people who fail miss the 80% line by two or three questions, and most pass on the second attempt. What happens next depends on your state: the wait before a retake ranges from the same day to a week, some states charge again, and most cap attempts per fee.
First, what still counts
A failed test is scored on its own. If you took general knowledge, air brakes and combination together and failed one, the other two normally stay valid, often for about a year, while you retake the one you missed. Your permit application does not usually reset after one fail; several states void it after three fails of the same test, or when the application period runs out.
The wait before you can retest
This is the rule that varies most. Some states let you come straight back, some make you wait until the next business day, and some impose a week, with longer waits after repeated fails. Here is what each state's licensing agency says on its own pages:
| State | If you fail | Source |
|---|---|---|
| Alaska | Knowledge tests may be taken once per day | dmv.alaska.gov |
| Arizona | Next business day | azdot.gov |
| California | No waiting period to retake a failed knowledge test | dmv.ca.gov |
| District of Columbia | 3 calendar days; retake on the fourth day | dmv.dc.gov |
| Hawaii | Minimum one week after a failed test (Honolulu) | honolulu.gov |
| Idaho | 3 days | itd.idaho.gov |
| Illinois | None for the first two retakes; 30 days after three fails, 90 after six, a year after nine | ilsos.gov |
| Indiana | Next business day | in.gov |
| Kentucky | 24 hours | drive.ky.gov |
| Maryland | At least 7 calendar days after failing two or more times | mva.maryland.gov |
| Michigan | One day after a failed attempt | michigan.gov |
| Minnesota | Each knowledge test may be attempted once per day | assets.dps.mn.gov |
| Missouri | May retake immediately, though the examiner may require you to return for a retake later | dor.mo.gov |
| Montana | Next working day the exam station is open | mvdmt.gov |
| Nebraska | At least one day | dmv.nebraska.gov |
| New Jersey | 7 days | nj.gov |
| New Mexico | Written tests may be taken up to twice a week | mvd.newmexico.gov |
| North Carolina | Next day: one attempt at each knowledge test per day | ncdot.gov |
| North Dakota | Only one attempt allowed per day | dot.nd.gov |
| Ohio | 1 day after a failed knowledge test | publicsafety.ohio.gov |
| Oregon | Can retake as early as the same day | oregon.gov |
| Rhode Island | Seven days | dmv.ri.gov |
| South Dakota | Next working day | sd.gov |
| Tennessee | Next day after a failed knowledge test | tn.gov |
| Vermont | At least one day after a failed knowledge test | dmv.vermont.gov |
| Virginia | Knowledge exams may be taken only once per business day | dmv.virginia.gov |
| West Virginia | 7 days after failing any part of the knowledge exam | webapps.transportation.wv.gov |
| Wisconsin | No sooner than the next day | wisconsindot.gov |
What a retake costs
Three patterns cover most states:
- One fee, several attempts. Many states sell an application that covers two or three attempts at each test. Fail three times and you pay again for another set.
- A small fee per test. Some states charge a few dollars for each attempt, pass or fail.
- Nothing for the retest. A few states charge for the permit or licence only and let you retake knowledge tests free.
Your state page lists the fees and the attempt limit where the agency publishes one.
Why people fail, and what to change
Drivers who fail usually fall into one of three groups.
Numbers. You knew the ideas but lost points on figures: following distance, tread depth, air pressures, the alcohol limit, stopping distances. Fix: write every number in the relevant section on one page and test yourself on that page until it is automatic. The air brakes guide has the air brake figures in one table.
Practice questions without the manual. You drilled a question bank, saw different wording at the office, and the memorised answers did not transfer. Fix: for every question you miss, read the paragraph of the manual it comes from, not just the explanation. PassRig shows the manual section on every question for this reason.
The last ten questions. You were passing at question 35 and lost it to concentration. Fix: do full-length mock exams with the real question count, start to finish, at least three times before the retake.
A two-day plan for the retake
- Take one full mock exam cold. Note every miss by topic.
- Read the manual section for each missed topic, start to end, not just the sentence with the answer.
- Take a second mock exam. You should be at 85% or better.
- On the day before the test, do the numbers page and one more mock exam. Stop when you have scored 90% twice.