TruckCodex

393.9A-LSLIWR — Inoperable required lamps

FMCSA violation code under Vehicle Maintenance. 37,274 events recorded in roadside inspections. Severity weight: 3.

Severity Weight
3
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
37,274
Code
393.9A-LSLIWR
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
3
Violation Group
—
Total Events
37,274
Carriers Cited
23,959

Violation Description

Operating a commercial motor vehicle with inoperable required lamps.

About This Violation Code

Code 393.9A-LSLIWR falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 3 (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 393.9A in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
37,274
OOS Events
36,841
OOS Rate
98.8%
Top State (180d)
California
1,476 events

Top Enforcing States

Where 393.9A-LSLIWR is most commonly cited (last 180 days)

1.California
1,476
OOS 98.6%
2.Missouri
925
OOS 100.0%
3.US
730
OOS 100.0%
4.Ohio
493
OOS 100.0%
5.Washington
441
OOS 100.0%
6.Maryland
412
OOS 100.0%
7.Arizona
382
OOS 100.0%
8.Tennessee
376
OOS 100.0%
9.New York
370
OOS 100.0%
10.Florida
342
OOS 100.0%
11.Pennsylvania
341
OOS 98.2%
12.Alabama
299
OOS 100.0%
13.Georgia
265
OOS 100.0%
14.South Carolina
240
OOS 100.0%
15.Wisconsin
206
OOS 100.0%

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

Citation Trend (12 months)

Monthly count of 393.9A-LSLIWR citations. Red bars mark months with OOS-triggering citations.

939
Apr
2,063
May
1,890
Jun
2,150
Jul
2,146
Aug
2,162
Sep
2,011
Oct
1,655
Nov
1,677
Dec
1,833
Jan
1,952
Feb
2,119
Mar
75
Apr

Most Active Stations

Inspection stations citing 393.9A-LSLIWR most often (last 180 days)

1.LAREDO TX
317
OOS 100.0%
2.EAGLEVILLE MO
245
OOS 100.0%
3.FORISTELL MO
93
OOS 100.0%
4.PA
92
OOS 97.8%
5.DESERT HILLS IF
87
OOS 98.9%
6.LONDON OH
85
OOS 100.0%
7.ROCK PORT MO
84
OOS 100.0%
8.NJ
79
OOS 96.2%
9.MEMPHIS TN
73
OOS 100.0%
10.YUMA AZ
72
OOS 100.0%

Often Cited Together

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

393.9A-LTSI1,383 co-occurrences396.17C-PI803 co-occurrences393.75A3-TAOL666 co-occurrences392.2-SLLSR583 co-occurrences393.9A-LIL549 co-occurrences393.47E497 co-occurrences393.55E-B463 co-occurrences393.9A-LSLI425 co-occurrences393.9A-LRLI414 co-occurrences393.9A-LCL354 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 23,959 carriers total • Page 1 of 959

Top Carriers with 393.9A-LSLIWR Violations

Showing 25 of 23,959

fmcsa-violations
Top Carriers with 393.9A-LSLIWR Violations
#CarrierUSDOT# Violations
#1J B HUNT TRANSPORT INC80806227
#2WESTERN EXPRESS INC511412164
#3FEDERAL EXPRESS CORPORATION86876163
#4SWIFT TRANSPORTATION CO OF ARIZONA LLC54283144
#5EVANS DELIVERY COMPANY INC38111138
#6UNITED PARCEL SERVICE INC21800123
#7WERNER ENTERPRISES INC5346796
#8US XPRESS INC30302496
#9CENTRAL TRANSPORT LLC66117393
#10NEW PRIME INC370692
#11SCHNEIDER NATIONAL CARRIERS INC26418489
#12TRANSPORTES DE CARGA FEMA SA DE CV117501873
#13GREENWOOD MOTOR LINES INC6339172
#14KNIGHT TRANSPORTATION INC42882367
#15IMC LOGISTICS LLC29299165
#16STG DRAYAGE LLC68814361
#17RTS HOLDINGS LLC236530850
#18JULIO CESAR CIENFUEGOS GARZA238956648
#19XPO LOGISTICS FREIGHT INC24182946
#20SAIA MOTOR FREIGHT LINE LLC2912445
#21CONTAINERPORT GROUP INC23273442
#22INTER MEXICANA DE TRANSPORTE SA DE CV171641540
#23ESTES EXPRESS LINES12101838
#24HUB GROUP DEDICATED LLC80182837
#25MARTEN TRANSPORT LTD7443237

Recent Inspections

Latest inspections where 393.9A-LSLIWR was cited • 37,274 total events • Page 1 of 1491

Recent Inspections with 393.9A-LSLIWR

Showing 25 of 37,274

fmcsa-inspections
Recent Inspections with 393.9A-LSLIWR
DateReport #StateLevelOOS
Apr 3, 202687486690OKLevel 2Yes
Apr 3, 202687485779KYLevel 1Yes
Apr 3, 202687485352MOLevel 2Yes
Apr 2, 202687484730USLevel 1Yes
Apr 2, 202687488603CALevel 1Yes
Apr 2, 202687486906MILevel 1Yes
Apr 2, 202687484059MOLevel 2Yes
Apr 2, 202687477408OKLevel 1Yes
Apr 2, 202687476125PALevel 2No
Apr 2, 202687475980VALevel 2Yes
Apr 2, 202687476503USLevel 1Yes
Apr 2, 202687475586SCLevel 2Yes
Apr 2, 202687475259SCLevel 2Yes
Apr 2, 202687481767ALLevel 2Yes
Apr 2, 202687484316MOLevel 2Yes
Apr 2, 202687484329MOLevel 1Yes
Apr 2, 202687485432ARLevel 2Yes
Apr 2, 202687484328MOLevel 2Yes
Apr 2, 202687489057CALevel 1Yes
Apr 2, 202687485774KYLevel 1Yes
Apr 2, 202687489125CALevel 2Yes
Apr 1, 202687485174IDLevel 1Yes
Apr 1, 202687482319PALevel 2Yes
Apr 1, 202687485433ARLevel 2Yes
Apr 1, 202687489002CALevel 1Yes

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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