TruckCodex

393.28-WS — Wiring - improper/inadequate

FMCSA violation code under Vehicle Maintenance. 1,402 events recorded in roadside inspections. Severity weight: 3.

Severity Weight
3
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
1,402
Code
393.28-WS
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
3
Violation Group
—
Total Events
1,402
Carriers Cited
1,031

Violation Description

CMV electrical wiring is improperly installed, insecure, or inadequately protected.

About This Violation Code

Code 393.28-WS 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 393.28 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
1,402
OOS Events
1
OOS Rate
0.1%
Top State (180d)
Arizona
146 events

Top Enforcing States

Where 393.28-WS is most commonly cited (last 180 days)

1.Arizona
146
OOS 0.0%
2.US
32
OOS 0.0%
3.California
20
OOS 0.0%
4.Alabama
15
OOS 0.0%
5.Missouri
13
OOS 0.0%
6.Georgia
10
OOS 0.0%
7.Utah
8
OOS 0.0%
8.Tennessee
6
OOS 0.0%
9.New York
6
OOS 0.0%
10.Florida
6
OOS 0.0%
11.South Carolina
6
OOS 0.0%
12.Pennsylvania
5
OOS 0.0%
13.Arkansas
4
OOS 0.0%
14.Colorado
4
OOS 0.0%
15.Kansas
4
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 393.28-WS citations. Red bars mark months with OOS-triggering citations.

39
Apr
80
May
65
Jun
92
Jul
92
Aug
72
Sep
73
Oct
52
Nov
66
Dec
54
Jan
54
Feb
54
Mar
2
Apr

Most Active Stations

Inspection stations citing 393.28-WS most often (last 180 days)

1.NOGALES AZ
65
OOS 0.0%
2.TUCSON AZ
11
OOS 0.0%
3.PHOENIX AZ
9
OOS 0.0%
4.NOGALES AZ
9
OOS 0.0%
5.SANTA TERESA NM
8
OOS 0.0%
6.EL PASO TX
7
OOS 0.0%
7.GREEN VALLEY AZ
7
OOS 0.0%
8.SEDONA AZ
6
OOS 0.0%
9.YUMA AZ
5
OOS 0.0%
10.I-5 S/B SANTA NELLA SCALE
5
OOS 0.0%

Often Cited Together

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

396.17C-PI36 co-occurrences393.75A3-TAOL36 co-occurrences393.55E-B33 co-occurrences396.5B-L30 co-occurrences393.47E28 co-occurrences393.9A-LIL22 co-occurrences393.45D-B20 co-occurrences393.78A-WS20 co-occurrences393.95A4-EEUS17 co-occurrences393.75C-TAOTD-LT2/3216 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 1,031 carriers total • Page 1 of 42

Top Carriers with 393.28-WS Violations

Showing 25 of 1,031

fmcsa-violations
Top Carriers with 393.28-WS Violations
#CarrierUSDOT# Violations
#1VRP TRANSPORTES DE MEXICO S DE RL DE CV66205812
#2TRANSPORTES EMMA S DE RL DE CV66475611
#3GUILLERMO ESQUER GARCIA303689811
#4JESUS PEDRO PEREZ CARRILLO115985110
#5DANIEL ERNESTO PENA COTA164763910
#6JOSE LUIS ARMENTA GAXIOLA153155910
#7JACOBO ESCOBOSA VALDIVIA24705339
#8TRANSPORTES J J GALLEGOS23128109
#9LAZARO TERAN QUIROZ20682338
#10RICARDO ANDRES PENA COTA5913578
#11JOSE JUAN ARMENTA SOTO20070788
#12MERCANOR SOLUTIONS SA DE CV41191498
#13OCTAVIO ANDRADE CORELLA5584407
#14LIPSA TRANSPORTES SA DE CV25841447
#15ALAN RICARDO GALINDO20793787
#16TECMA TRANSPORTATION SERVICES S DE RL DE CV21979157
#17JUAN FRANCISCO RUIZ VASQUEZ29231916
#18HUGO MANUEL SANCHEZ ACOSTA25652356
#19TRACTOREMOLQUES AMSA SA DE CV12033736
#20RODRIGO ARREOLA SALAZAR6389116
#21BULLET TRANSPORT SERVICES MX S DE RL DE CV24030925
#22WESTERN EXPRESS INC5114125
#23EMMA LEONOR DIAZ DE LEON HERRERA21260305
#24NOEL OLEGARIO IRIARTE VICENTE32546885
#25TPO TRANSPORTES SA DE CV30271355

Recent Inspections

Latest inspections where 393.28-WS was cited • 1,402 total events • Page 1 of 57

Recent Inspections with 393.28-WS

Showing 25 of 1,402

fmcsa-inspections
Recent Inspections with 393.28-WS
DateReport #StateLevelOOS
Apr 1, 202687483480AZLevel 2No
Apr 1, 202687480745CALevel 2No
Mar 31, 202687457592ALLevel 2No
Mar 30, 202687471608ALLevel 2No
Mar 30, 202687446532ALLevel 1No
Mar 28, 202687433789AZLevel 2No
Mar 27, 202687428733MOLevel 1No
Mar 27, 202687431930MOLevel 1No
Mar 27, 202687429348AZLevel 2No
Mar 26, 202687412337CALevel 1No
Mar 26, 202687426825AZLevel 2No
Mar 26, 202687426629AZLevel 2No
Mar 25, 202687414292AZLevel 1No
Mar 25, 202687418886MSLevel 1No
Mar 24, 202687381059MOLevel 1No
Mar 23, 202687388437AZLevel 2No
Mar 23, 202687390437AZLevel 1No
Mar 22, 202687377055CALevel 1No
Mar 21, 202687354024AZLevel 2No
Mar 21, 202687372920WYLevel 2No
Mar 20, 202687413201NYLevel 1No
Mar 20, 202687350866AZLevel 2No
Mar 20, 202687378379SCLevel 2No
Mar 20, 202687379435ALLevel 2No
Mar 19, 202687340004AZLevel 2No

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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