TruckCodex

393.81-H — Horn inoperable

FMCSA violation code under Vehicle Maintenance. 11,171 events recorded in roadside inspections. Severity weight: 2.

Severity Weight
2
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
11,171
Code
393.81-H
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
2
Violation Group
—
Total Events
11,171
Carriers Cited
9,207

Violation Description

Horn on commercial motor vehicle is inoperable or not functioning properly.

About This Violation Code

Code 393.81-H falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 2 (scale 1-10, higher = more severe).

When this violation is cited during a roadside inspection, it contributes to the carrier's Vehicle Maintenance BASIC score. Carriers with high BASIC percentiles may be prioritized for FMCSA interventions including warning letters, investigations, or compliance reviews.

Regulatory Reference

Federal Motor Carrier Safety Regulations

This violation references 49 CFR 393.81 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
11,171
OOS Events
5
OOS Rate
0.0%
Top State (180d)
US
308 events

Top Enforcing States

Where 393.81-H is most commonly cited (last 180 days)

1.US
308
OOS 0.0%
2.California
272
OOS 0.0%
3.Florida
227
OOS 0.0%
4.New York
205
OOS 0.0%
5.Maryland
180
OOS 0.0%
6.Pennsylvania
150
OOS 0.0%
7.Georgia
140
OOS 0.0%
8.New Jersey
128
OOS 0.0%
9.Washington
98
OOS 0.0%
10.Colorado
74
OOS 0.0%
11.Kentucky
67
OOS 0.0%
12.Missouri
66
OOS 0.0%
13.Alabama
64
OOS 0.0%
14.Arizona
61
OOS 0.0%
15.Wisconsin
59
OOS 0.0%

Click a state to see roadside inspection activity, top stations, and carrier profiles in that jurisdiction.

Citation Trend (12 months)

Monthly count of 393.81-H citations. Red bars mark months with OOS-triggering citations.

276
Apr
644
May
568
Jun
638
Jul
660
Aug
687
Sep
637
Oct
497
Nov
516
Dec
508
Jan
520
Feb
568
Mar
22
Apr

Most Active Stations

Inspection stations citing 393.81-H most often (last 180 days)

1.LAREDO TX
127
OOS 0.0%
2.NJ
80
OOS 0.0%
3.SAN DIEGO CA
41
OOS 0.0%
4.PA
33
OOS 0.0%
5.BALTIMORE MD
29
OOS 0.0%
6.EL PASO TX
29
OOS 0.0%
7.DESERT HILLS IF
22
OOS 0.0%
8.BROWNSVILLE TX
19
OOS 0.0%
9.BRONX NY
19
OOS 0.0%
10.HIALEAH FL
18
OOS 0.0%

Often Cited Together

Other violations commonly found on the same inspection (last 90 days)

396.17C-PI388 co-occurrences392.2-SLLSR321 co-occurrences393.9A-LIL262 co-occurrences393.78A-WS260 co-occurrences393.95A1193 co-occurrences393.95F169 co-occurrences393.9A-LCL166 co-occurrences393.9A-LFTSI166 co-occurrences396.5B-L148 co-occurrences390.21TB2-DOT144 co-occurrences

Citation patterns suggest related root causes (e.g., HOS violations paired with logbook errors).

Top Carriers Cited

Ranked by frequency • 9,207 carriers total • Page 1 of 369

Top Carriers with 393.81-H Violations

Showing 25 of 9,207

fmcsa-violations
Top Carriers with 393.81-H Violations
#CarrierUSDOT# Violations
#1KORAIMA EVELYN GRIJALVA DE LA ROSA374793459
#2FEDERAL EXPRESS CORPORATION8687651
#3JULIO CESAR LERMA GONZALEZ244155921
#4DAVID MILAN RIVERA253047221
#5FLETES MUSA SA DE CV168429818
#6SONIA ALEJANDRA IBARRA OCHOA298892818
#7CARLOS GILBERTO ARIZPE BENAVIDES117111515
#8RICARDO GABRIEL PEREZ SEPULVEDA337045414
#9MARYLAND TREE EXPERTS330493113
#10Z AUTOMOTRIZ Y AUTOTRANSPORTE S A DE C V85185912
#11CNC LOGISTICS S DE RL DE CV272620312
#12JESUS SERGIO ESTRADA SAENZ122969112
#13FLETES EXPRESS DEL NORTE SA DE CV105596411
#14TRANSPORTES CRUZADOS SA DE CV169461111
#15REISEN LOGISTICS SA DE CV250823911
#16JOSE EMMANUEL RAMOS SANCHEZ128128411
#17NADIA LETICIA PENA BARRERA362379911
#18FIRST STUDENT INC35440610
#19TRANSPORTES EMMA S DE RL DE CV66475610
#20EMMANUEL BASURTO HUIJARA250292910
#21DAVID ALBERTO DAMKEN GUERRERO403324310
#22UNITED PARCEL SERVICE INC218009
#23FLETES MARSA INTERNACIONAL SA DE CV6660909
#24JUAN CARLOS PEREZ ATZIN37317659
#25TRANSPORTE INTERNACIONAL LOPEZ OCHOA SA DE C V10419079

Recent Inspections

Latest inspections where 393.81-H was cited • 11,171 total events • Page 1 of 447

Recent Inspections with 393.81-H

Showing 25 of 11,171

fmcsa-inspections
Recent Inspections with 393.81-H
DateReport #StateLevelOOS
Apr 2, 202687476940KYLevel 2No
Apr 2, 202687477019KYLevel 1No
Apr 2, 202687477116KYLevel 2No
Apr 2, 202687480731CALevel 2No
Apr 2, 202687486684OKLevel 2No
Apr 2, 202687480660CALevel 2No
Apr 2, 202687480348CALevel 1No
Apr 2, 202687476429UTLevel 1No
Apr 1, 202687480751CALevel 2No
Apr 1, 202687484713USLevel 1No
Apr 1, 202687475217USLevel 1No
Apr 1, 202687477814MILevel 2No
Apr 1, 202687480750CALevel 1No
Apr 1, 202687484742GALevel 1No
Apr 1, 202687489523CALevel 2No
Apr 1, 202687483193AZLevel 2No
Apr 1, 202687482329COLevel 2No
Apr 1, 202687458385KSLevel 2No
Apr 1, 202687458900PALevel 2No
Apr 1, 202687458973ALLevel 2No
Apr 1, 202687474881USLevel 1No
Apr 1, 202687474415VALevel 2No
Mar 31, 202687473457FLLevel 2No
Mar 31, 202687472851MDLevel 2No
Mar 31, 202687450883VALevel 1No

Data sources & freshness

FMCSA Vehicle Inspections and Violations
Unknown freshness
Federal Motor Carrier Safety Regulations (49 CFR)
Unknown freshness

Related records

CategoryAll Vehicle Maintenance Violations
Browse all violation codes in the Vehicle Maintenance BASIC
IndexAll Violation Codes
FMCSR violation codes by BASIC category
ReferenceFMCSA Roadside Inspections
Inspection levels and procedures
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