FMCSA Violation Code Reference
Browse all Federal Motor Carrier Safety Regulation (FMCSR) violation codes ranked by citation frequency. Filter by BASIC category, OOS eligibility, or search by code number.
Violation Codes
3,146
BASIC Categories
11
Total Cited
13,023,843
Overall OOS Rate
17.5%
BASIC Categories
Select a category to filter
Vehicle Maintenance
21.0%1,339 codes7,809,333 cited
Unsafe Driving
216 codes3,025,638 cited
Hours of Service
16.3%312 codes1,170,331 cited
Driver Fitness
59.9%119 codes493,083 cited
General/Admin
168 codes413,962 cited
Hazardous Materials
28.3%889 codes75,516 cited
Unknown
41 codes18,680 cited
Controlled Substances/Alcohol
97.3%38 codes16,322 cited
Hazardous Materials Compliance
19 codes967 cited
Hours-of-Service Compliance
36.4%2 codes11 cited
Crash Indicator
3 codes
OOS Eligible Only1,339 codes • Page 2 of 27
All Violation Codes
Ranked by citation frequency
| Rank ▼ | Code | Description | OOS | Times Cited ▼ |
|---|---|---|---|---|
| #51 | 393.60D | Glazing/window obstructions | \u2014 | 39,062 |
| #52 | 393.75C | Tire tread depth insufficient (other axles) | \u2014 | 38,759 |
| #53 | 393.9A-LSLIWR | Inoperable required lamps | \u2014 | 37,274 |
| #54 | 393.60(d) | Glazing/window obstructions | \u2014 | 37,236 |
| #55 | 393.55E | Coupling device/towing methods defective | \u2014 | 36,541 |
| #56 | 393.9A-LRLI | Inoperable required lamps | \u2014 | 36,100 |
| #57 | 396.3A1-BALAC | Brake - Audible air leak from a brake chamber | \u2014 | 35,657 |
| #58 | 393.45B2-BHTD | Brake tubing/hoses inadequate | \u2014 | 33,075 |
| #59 | 393.19 | Hazard warning signal inoperable | \u2014 | 30,339 |
| #60 | 393.9A-LBL | Inoperable required lamps | \u2014 | 29,475 |
| #61 | 396.9D2-FTF | Failing to correct the violation(s)/defect(s) noted on the roadside inspection report | \u2014 | 28,682 |
| #62 | 396.3A1-ALBV | Air Brake - Any leak from a brake valve | \u2014 | 27,203 |
| #63 | 393.48A | Inoperative/defective brakes | \u2014 | 26,907 |
| #64 | 393.75(a) | Tires/tubes - general defects | OOS | 26,907 |
| #65 | 393.83G | Exhaust - Discharging at a point forward or directly below the driver or sleeper compartment | \u2014 | 26,513 |
| #66 | 393.9A-HLLH | Inoperable required lamps | \u2014 | 26,416 |
| #67 | 393.207(a) | Suspension defective | OOS | 25,723 |
| #68 | 393.9H | Inoperable head lamps | \u2014 | 25,067 |
| #69 | 393.11A1-CSLRR | Lighting devices/reflectors | \u2014 | 24,992 |
| #70 | 393.43 | Brake - relay emergency valve | OOS | 23,816 |
| #71 | 396.3A1BOS | BRAKES OUT OF SERVICE: The number of defective brakes is equal to or greater than 20 percent of the service brakes on the vehicle or combination | \u2014 | 23,333 |
| #72 | 393.11TL | Lighting devices/reflectors | \u2014 | 23,327 |
| #73 | 393.75(a)(1) | Tire-ply or belt material exposed | \u2014 | 23,264 |
| #74 | 393.100B-C | Cargo securement - aggregate working load | \u2014 | 23,086 |
| #75 | 393.55D1-B | Coupling device/towing methods defective | \u2014 | 22,987 |
| #76 | 396.9(d)(2) | Failure to correct defects noted on previous inspection report | \u2014 | 22,684 |
| #77 | 393.83(g) | Exhaust - Discharging at a point forward or directly below the driver or sleeper compartment | \u2014 | 22,015 |
| #78 | 393.9A-LTSIR | Inoperable required lamps | \u2014 | 21,662 |
| #79 | 393.11(a)(1) | Lighting devices/reflectors | \u2014 | 21,415 |
| #80 | 393.9A-LHWS | Inoperable required lamps | \u2014 | 21,413 |
| #81 | 393.205(c) | Wheel fasteners loose and/or missing | \u2014 | 21,263 |
| #82 | 396.5B-HWSL | Fuel system leak | \u2014 | 21,028 |
| #83 | 393.47(a) | Brake chamber - cracked/broken | OOS | 20,741 |
| #84 | 393.11A1-LLPL | Lighting devices/reflectors | \u2014 | 20,293 |
| #85 | 393.48A-BIBD | Inoperative/defective brakes | \u2014 | 20,149 |
| #86 | 393.43DBMA | Brake - relay emergency valve | \u2014 | 19,105 |
| #87 | 393.48A-BIHE | Inoperative/defective brakes | \u2014 | 18,803 |
| #88 | 393.11A1-CSURR | Lighting devices/reflectors | \u2014 | 18,270 |
| #89 | 393.209E-SPSLA | Steering - Power steering leaking anywhere. | \u2014 | 18,255 |
| #90 | 396.3A1B | Brakes (general) Explain: | \u2014 | 18,126 |
| #91 | 393.55(d)(1) | Coupling device/towing methods defective | \u2014 | 17,654 |
| #92 | 393.75A1-TEPBM | Tires - All others - Exposed ply or belt material in tread or sidewall area | \u2014 | 17,324 |
| #93 | 393.75A3-TAOLTIS | Tires - All others leaking in tread area and inflation less than 50% of the maximum inflation pressure on tire equipped with ATIS | \u2014 | 17,254 |
| #94 | 393.205C-WRAWFLMIB | Wheel/Rim - Any wheel fasteners loose/missing/ineffective/broken. | \u2014 | 16,871 |
| #95 | 393.45D-BAAL | Brake tubing/hoses inadequate | \u2014 | 16,256 |
| #96 | 393.100(b) | Cargo securement - aggregate working load | OOS | 16,155 |
| #97 | 393.75C-TAOTD-LT1/32 | Tire tread depth insufficient (other axles) | \u2014 | 16,050 |
| #98 | 393.11TU | Lighting devices/reflectors | \u2014 | 15,919 |
| #99 | 393.75(g) | 393.75(g) | \u2014 | 15,809 |
| #100 | 393.55D2-B | Coupling device/towing methods defective | \u2014 | 15,737 |
About Violation Codes
Each violation found during a roadside inspection is assigned a code from the Federal Motor Carrier Safety Regulations (49 CFR Parts 350-399) or Hazardous Materials Regulations (49 CFR Parts 171-180). These codes map to one of seven BASIC categories used in the FMCSA Safety Measurement System (SMS).
Violations flagged as Out-of-Service (OOS) indicate conditions severe enough to remove a vehicle or driver from service until corrected. OOS violations carry more weight in SMS percentile calculations.
Carriers and drivers who believe a violation was recorded in error can file a Request for Data Review (DataQs) through the FMCSA DataQs system.
Data sources & freshness
FMCSA Vehicle Inspections and Violations
Violation event counts are pre-computed from 13M+ inspection records. Counts are refreshed daily.
Unknown freshness