Annex OrbisFMCSA · SAFETY STATISTICS
What puts trucks and drivers out of service?
The most frequent out-of-service violations in our indexed FMCSA inspection records, ranked by violation code.
Recorded violations13,594,393
Out-of-service violations2,416,602
Violation codes2,379
All violation codes
Highest OOS count first. Codes with no recorded OOS occurrences appear last.
| Violation code | Description | OOS occurrences | All occurrences | Share of all OOS |
|---|---|---|---|---|
| 393.55C1-B | Air Brake - Truck-tractor manufactured on or after March 1, 1997, not equipped with an ABS system. System does not function or indicates a fault. | 0 | 21,772 | 0.0% |
| 393.55C2-B | Air Brake - CMV other than truck-tractor manufactured on or after March 1, 1998 not equipped with an antilock brake system. System does not function or indicates | 0 | 13,362 | 0.0% |
| 393.55D1-B | Air Brake - ABS malfunction lamp defective on truck-tractor manufactured on or after March 1, 1997 and each single unit CMV on or after 1998. | 0 | 34,051 | 0.0% |
| 393.55D2-B | Air Brake - ABS malfunction lamp defective on truck-tractor manufactured on or after March 1, 2001 for towed vehicle. | 0 | 22,631 | 0.0% |
| 393.55D3-B | Air Brake - ABS malfunction, trailers manufactured after March 1, 2001 unable to transmit ABS malfunction signal to towing vehicle | 0 | 3,202 | 0.0% |
| 393.61 | Inadequate or missing truck side windows | 0 | 291 | 0.0% |
| 393.61-WD | Windows - Missing side window(s) in driver compartment | 0 | 487 | 0.0% |
| 393.65B | Improper location of fuel system | 0 | 36 | 0.0% |
| 393.65B-F | Fuel - Improper location of fuel system | 0 | 41 | 0.0% |
| 393.67C10-F | Fuel - No fuel tank air vent | 0 | 11 | 0.0% |
| 393.67C11-F | Fuel - No visible fill warning marking | 0 | 961 | 0.0% |
| 393.67C4-F | Fuel - Improper drains and bottom fittings | 0 | 606 | 0.0% |
| 393.67C8-F | Fuel - Improper fuel tank safety vent | 0 | 29 | 0.0% |
| 393.67F-F | Fuel - Tank not marked with proper certification | 0 | 100 | 0.0% |
| 393.68 | CNG Fuel Container does not conform to regulations | 0 | 3 | 0.0% |
| 393.68C-F | Fuel - Compressed Natural Gas (CNG) fuel container is not labeled | 0 | 8 | 0.0% |
| 393.70B1I-CDCG-L6 | Coupling - A crack, or gap caused by corrosion | 0 | 53 | 0.0% |
| 393.70B1I-CDCW-LT20 | Coupling - 20% or less of the total original welds are cracked on either side of the vehicle | 0 | 63 | 0.0% |
| 393.70B1I-CDPB-LT20 | Coupling - Mounting plate or pivot bracket has 20% or less of the total original welds are cracked on either side of the vehicle | 0 | 11 | 0.0% |
| 393.70B1II-CDUC-LT20 | Coupling - Upper coupler has 20% or less of the total original welds are cracked on either side of the vehicle | 0 | 29 | 0.0% |
| 393.70C-CDTUFT | Coupling - Turntable upper flange touching lower flange | 0 | 1 | 0.0% |
| 393.71A-CDTMTTSM | Coupling - Towing more than three saddle-mounted vehicles | 0 | 8 | 0.0% |
| 393.71B3 | Improper weight distribution drive-away/towaway | 0 | 1 | 0.0% |
| 393.71B-CDTVIT | Coupling - Towed vehicle interferes with towing vehicle | 0 | 4 | 0.0% |
| 393.71E-CDSMWFWR | Coupling - Saddle-mounted vehicle without front wheels restrained | 0 | 8 | 0.0% |
| 393.71F-CDSMTWSL | Coupling - Saddle-mounted vehicle towed by the rear without steering locked | 0 | 6 | 0.0% |
| 393.71G | Prohibited towing connection / device | 0 | 9 | 0.0% |
| 393.71H10-CDDISD | Coupling - Driveaway, improper safety device | 0 | 27 | 0.0% |
| 393.71H-CDDDSM | Coupling - Driveaway, drawbar slider movement more than 1/4 inch | 0 | 1 | 0.0% |
| 393.71J-CDIUHSM | Coupling - Improper upper half of saddle-mount | 0 | 3 | 0.0% |
| 393.71K-CDILHSM | Coupling - Improper lower half of saddle-mount | 0 | 3 | 0.0% |
| 393.71L-CDIKPSM | Coupling - Improper king pin of saddle-mount | 0 | 2 | 0.0% |
| 393.71M-CDIASMR | Coupling - Improper additional saddle-mount requirements | 0 | 4 | 0.0% |
| 393.75D-TFPCV | Tires - Front, Passenger Carrying Vehicle has regrooved/recapped/retreaded | 0 | 1 | 0.0% |
| 393.75E-TFRT-6 | Tires - Front, Any regrooved tire. | 0 | 28 | 0.0% |
| 393.75H1-2002 | Mobile Home weight exceeds tire load limit - Mobile Home manufactured before Jan. 1, 2002 | 0 | 1 | 0.0% |
| 393.76B-SB | Sleeper Berth - Improper location | 0 | 22 | 0.0% |
| 393.76C-SB | Sleeper Berth - Inadequate exit | 0 | 32 | 0.0% |
| 393.76D-SB | Sleeper Berth - Not equipped with means of communication with driver. | 0 | 5 | 0.0% |
| 393.76E-SB | Sleeper Berth - Inadequate bedclothing, blankets and mattress | 0 | 88 | 0.0% |
| 393.76F-SB | Sleeper Berth - Inadequate ventilation | 0 | 11 | 0.0% |
| 393.76H-SB | Sleeper Berth - Manufactured on or after July 1, 1971, no occupant restraint system | 0 | 51 | 0.0% |
| 393.77 | Defective and/or prohibited heaters | 0 | 33 | 0.0% |
| 393.77A-HT | Heaters - Use of Prohibited Type of Heater | 0 | 3 | 0.0% |
| 393.77B-HT | Heaters - Heater does not comply with specifications | 0 | 17 | 0.0% |
| 393.82 | Speedometer inoperative / inadequate | 0 | 1,970 | 0.0% |
| 393.86A2-RIG | Rear Impact Guards - Trailers and semitrailers manufactured on or after January 26, 1998 inadequate width. | 0 | 766 | 0.0% |
| 393.86A3 | Rear Impact Guard having improper height - trailer manufactured on or after January 26, 1998 | 0 | 151 | 0.0% |
| 393.86A3-RIG | Rear Impact Guards - Trailers and semitrailers manufactured on or after January 26, 1998 improper height | 0 | 204 | 0.0% |
| 393.86A4 | Rear Impact Guard not within 12 in of rear of vehicle at 22 in above the ground | 0 | 145 | 0.0% |
How to read this report
Each indexed violation identity counts once. Only a violation explicitly marked out of service contributes to the OOS count. Repeated copies are counted once; conflicting code or OOS values are excluded. Unknown flags remain in all occurrences but not in the OOS count. Missing codes appear as “Code not reported”.
These are violation counts, not unique inspections, trucks, drivers, or carrier-wide out-of-service orders. Coverage describes the currently indexed inspection dataset, not all historical FMCSA records. Frequencies do not establish crash causation or a carrier’s safety rating.
Unknown OOS flags: 112 · Conflicting records excluded: 0
FMCSA source data ↗