FMCSA DOT Violation Codes Explained

Common roadside inspection violation codes in plain English — what each means, how serious it is, and what to verify before buying a used commercial truck.

Data sources: NHTSA vPIC (queried live) and FMCSA public inspection records (bulk-refreshed monthly · last refreshed July 1, 2026).

Quick answer

FMCSA roadside violations are cited under 49 CFR codes (for example, 393.47 for brakes or 393.75 for tires). Each identifies a specific condition found during a roadside inspection. A historical violation does not prove a current defect — it tells a buyer exactly what to verify. Check whether a specific VIN has these violations with a free TruckWhere VIN lookup.

Brakes

393.47 — Brakes out of adjustment / inadequate for safe stopping 393.48 — Inoperative or defective brakes 393.45 — Brake tubing and hose — leaks or damage

Tires and wheels

393.75 — Tires — tread depth, flat, or unsafe condition 393.205 — Wheels and rims — cracks or fasteners

Lighting

393.9 — Inoperative required lamps 393.11 — Lamps and reflective devices — required equipment

Steering

393.209 — Steering wheel and steering system

Suspension

393.207 — Suspension — springs, hangers, U-bolts

Frame

393.201 — Frame — cracks or defects

Other

396.3 — Inspection, repair, and maintenance — parts and accessories 393.104 — Cargo securement — deficient devices 393.95 — Emergency equipment — fire extinguisher, warning devices

Visibility

393.60 — Windshield and glazing — damage or obstruction

Check a VIN for these violations →

Learn more

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