CDL Disqualification: Major Offenses and Serious Violations

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A CDL can be lost for conviction of certain offenses, even in your own car. Here are the disqualification periods in 49 CFR 383.51, in plain English.

Major offenses

For a first conviction while driving a CMV, these offenses mean a 1-year disqualification (3 years if you were transporting hazardous materials). A second conviction means life.

• Driving under the influence of alcohol
• Driving under the influence of a controlled substance
• Driving a CMV with an alcohol concentration of 0.04 or greater
• Refusing a required alcohol test
• Leaving the scene of an accident
• Using the vehicle to commit a felony
• Driving a CMV while your CDL is revoked, suspended, canceled or you are disqualified
• Causing a fatality through negligent operation of a CMV

Several of these also count when you are driving a non-CMV (your own car): the DUI offenses, the alcohol-test refusal, leaving the scene and using the vehicle for a felony carry a 1-year CDL disqualification on a first conviction.

The worst cases

• Using a vehicle in a felony involving manufacturing, distributing or dispensing a controlled substance: life, with no 10-year reinstatement.
• Using a CMV in a felony involving severe forms of human trafficking: life, with no 10-year reinstatement.
• For the other lifetime disqualifications, a state may reinstate after 10 years if the driver completed an approved rehabilitation program. A second disqualifying conviction after reinstatement ends that option.

Serious traffic violations

These do not disqualify you on the first offense, but add up. A second conviction in a separate incident within 3 years means 60 days; a third or later within 3 years means 120 days.

• Speeding 15 mph or more above the limit
• Reckless driving
• Improper or erratic lane changes
• Following the vehicle ahead too closely
• A traffic-control violation connected to a fatal accident
• Driving a CMV without a CDL, or without it in your possession
• Driving without the proper class or endorsements for the vehicle
• Texting while driving a CMV, or using a hand-held mobile phone, where state or local law prohibits it

Why it matters for studying

A driver who is disqualified must not drive a CMV, and an employer must not knowingly allow, require or permit it. Your state’s CDL manual explains how it applies these rules.

Official sources

• 49 CFR § 383.51, Disqualification of drivers

Keep reading

• Hours of Service for Truck Drivers: 11, 14, 60 and 70 Explained
• ELDT: Entry-Level Driver Training Rules for a CDL

Facts checked against the official text of 49 CFR (eCFR) as current on October 15, 2026. Rules change and each state adds its own: confirm with your DMV and the FMCSA. PassYourCDL is an independent study site, not affiliated with the FMCSA, the DOT or any DMV, and this is not legal advice.