TruckCodex

393.47E — Slack adjuster defective

FMCSA violation code under Vehicle Maintenance. 180,363 events recorded in roadside inspections. Severity weight: 7.

Severity Weight
7
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
180,363
Code
393.47E
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
7
Violation Group
—
Total Events
180,363
Carriers Cited
58,604

Violation Description

Automatic or manual slack adjuster on CMV is defective or out of adjustment.

About This Violation Code

Code 393.47E falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 7 (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 393.47E in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
180,363
OOS Events
0
OOS Rate
0.0%
Top State (180d)
Texas
17,687 events

Top Enforcing States

Where 393.47E is most commonly cited (last 180 days)

1.Texas
17,687
OOS 0.0%
2.California
7,820
OOS 0.0%
3.US
4,649
OOS 0.0%
4.Kentucky
1,565
OOS 0.0%
5.Missouri
1,497
OOS 0.0%
6.Utah
1,305
OOS 0.0%
7.Tennessee
1,227
OOS 0.0%
8.Arizona
1,218
OOS 0.0%
9.New Mexico
1,055
OOS 0.0%
10.Maryland
958
OOS 0.0%
11.Pennsylvania
913
OOS 0.0%
12.Arkansas
881
OOS 0.0%
13.Michigan
864
OOS 0.0%
14.Louisiana
806
OOS 0.0%
15.Washington
738
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 393.47E citations. Red bars mark months with OOS-triggering citations.

5,535
Apr
12,557
May
9,408
Jun
11,111
Jul
12,758
Aug
10,207
Sep
12,334
Oct
9,482
Nov
8,235
Dec
9,503
Jan
9,789
Feb
10,671
Mar
467
Apr

Most Active Stations

Inspection stations citing 393.47E most often (last 180 days)

1.YSLETA POE
1,682
OOS 0.0%
2.LAREDO TX
1,331
OOS 0.0%
3.PHARR POE
1,024
OOS 0.0%
4.COLUMBIA POE
883
OOS 0.0%
5.OTAY MESA IF
730
OOS 0.0%
6.BOTA POE
673
OOS 0.0%
7.PHARR TX
656
OOS 0.0%
8.DESERT HILLS IF
576
OOS 0.0%
9.CORDELIA IF
572
OOS 0.0%
10.LONDON
549
OOS 0.0%

Often Cited Together

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

393.53B-B9,130 co-occurrences393.53B5,744 co-occurrences396.3A1-BOS4,487 co-occurrences393.92,986 co-occurrences396.3A1BOS2,413 co-occurrences393.45B2UV2,206 co-occurrences393.75A3-TAOL1,794 co-occurrences396.3A11,773 co-occurrences393.45D-B1,638 co-occurrences393.45B2-B-AIR1,555 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 58,604 carriers total • Page 1 of 2345

Top Carriers with 393.47E Violations

Showing 25 of 58,604

fmcsa-violations
Top Carriers with 393.47E Violations
#CarrierUSDOT# Violations
#1SERVICIO INTERNACIONAL DE ENLACE TERRESTRE SA DE CV818175501
#2VRP TRANSPORTES DE MEXICO S DE RL DE CV662058381
#3OPERADORA DE TRANSPORTE INTERNACIONAL SA DE CV683428378
#4SERVICIO DE TRANSPORTE INTERNACIONAL Y LOCAL SA DE CV557341371
#5EVANS DELIVERY COMPANY INC38111368
#6TRANSPORTATION AND CARGO SOLUTIONS S DE RL DE CV779973366
#7TRANSPORTADORA NORTE DE CHIHUAHUA S A DE C V711125355
#8FEDERAL EXPRESS CORPORATION86876246
#9TRANSPORTES AGUILA DE CIUDAD JUAREZ SA DE CV555365240
#10SWIFT TRANSPORTATION CO OF ARIZONA LLC54283230
#11SERGIO VARELA MALDONADO725226228
#12SERVICIOS DE LOGISTICA TRANSNACIONAL EN TRANSPORTACION SA DE CV2380911217
#13TRANSPORTES SOTO E HIJOS S A DE C V824454215
#14J B HUNT TRANSPORT INC80806191
#15AUTOTRANSPORTES VARELA DAVILA SA DE CV1716824184
#16TRANSPORTES DE CARGA FEMA SA DE CV1175018179
#17TRANSPORTES CANALES S A DE C V558899175
#18RGX TRANSPORTE DE CARGA INTERNACIONAL SA DE CV1207678170
#19WESTERN EXPRESS INC511412164
#20TRANSPORTES CRUZADOS SA DE CV1694611161
#21LINEA AMERICA TRANSPORTE S DE RL DE CV3240043153
#22BORDER EXPRESS DE MEXICO SA DE CV1692179144
#23TRANSPORTES LARMEX SA DE CV2436353140
#24FLETES SOTELO SA DE CV258923140
#25AKNA TRANSPORTES S DE RL DE CV1856796139

Recent Inspections

Latest inspections where 393.47E was cited • 180,363 total events • Page 1 of 7215

Recent Inspections with 393.47E

Showing 25 of 180,363

fmcsa-inspections
Recent Inspections with 393.47E
DateReport #StateLevelOOS
Apr 3, 202687488804CALevel 5No
Apr 3, 202687485641MALevel 5No
Apr 3, 202687488764CALevel 1No
Apr 3, 202687485090USLevel 1No
Apr 3, 202687488416CALevel 1No
Apr 3, 202687488590CALevel 1No
Apr 3, 202687489294CALevel 1No
Apr 3, 202687485244MOLevel 1No
Apr 3, 202687485255USLevel 1No
Apr 3, 202687489603CALevel 1No
Apr 3, 202687485748KYLevel 1No
Apr 2, 202687485673MALevel 5No
Apr 2, 202687481041CALevel 1No
Apr 2, 202687480134CALevel 1No
Apr 2, 202687488943CALevel 1No
Apr 2, 202687488942CALevel 1No
Apr 2, 202687488055TXLevel 2No
Apr 2, 202687488886CALevel 1No
Apr 2, 202687485126USLevel 1No
Apr 2, 202687488884CALevel 1No
Apr 2, 202687475015ARLevel 1No
Apr 2, 202687475355SCLevel 1No
Apr 2, 202687484975VALevel 1No
Apr 2, 202687484923VALevel 1No
Apr 2, 202687487520TXLevel 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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