TruckCodex

393.79 — Defroster/Defogger - Inoperative or defective

FMCSA violation code under Vehicle Maintenance. 4,065 events recorded in roadside inspections. Severity weight: N/A.

Severity Weight
N/A
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
4,065
Code
393.79
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
N/A
Violation Group
—
Total Events
4,065
Carriers Cited
3,096

Violation Description

Defroster/Defogger - Inoperative or defective

About This Violation Code

Code 393.79 falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS).

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 393.79 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
4,065
OOS Events
1
OOS Rate
0.0%
Top State (180d)
Texas
628 events

Top Enforcing States

Where 393.79 is most commonly cited (last 180 days)

1.Texas
628
OOS 0.0%
2.Arizona
103
OOS 0.0%
3.California
46
OOS 0.0%
4.Connecticut
21
OOS 0.0%
5.Georgia
9
OOS 0.0%
6.Utah
9
OOS 0.0%
7.Colorado
8
OOS 0.0%
8.New York
6
OOS 0.0%
9.Missouri
4
OOS 0.0%
10.Florida
4
OOS 0.0%
11.US
4
OOS 0.0%
12.Indiana
3
OOS 0.0%
13.South Carolina
3
OOS 0.0%
14.Alabama
2
OOS 0.0%
15.Illinois
2
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 393.79 citations. Red bars mark months with OOS-triggering citations.

50
Apr
117
May
126
Jun
146
Jul
173
Aug
169
Sep
158
Oct
124
Nov
138
Dec
121
Jan
205
Feb
220
Mar
6
Apr

Most Active Stations

Inspection stations citing 393.79 most often (last 180 days)

1.PHARR POE
179
OOS 0.0%
2.IH-0635 IN DALLAS CO. (0-35)
13
OOS 0.0%
3.INDIOS POE
12
OOS 0.0%
4.MESA AZ
12
OOS 0.0%
5.GOODYEAR AZ
9
OOS 0.0%
6.US181 KARNES SCALE
8
OOS 0.0%
7.PHOENIX AZ
8
OOS 0.0%
8.CHANDLER AZ
8
OOS 0.0%
9.TONOPAH AZ
8
OOS 0.0%
10.BUCKEYE AZ
7
OOS 0.0%

Often Cited Together

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

393.9317 co-occurrences393.78153 co-occurrences393.45B2UV142 co-occurrences393.47E128 co-occurrences396.3A1114 co-occurrences396.5B111 co-occurrences393.83G110 co-occurrences396.5B-HWSLIW84 co-occurrences393.53B78 co-occurrences393.95A76 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 3,096 carriers total • Page 1 of 124

Top Carriers with 393.79 Violations

Showing 25 of 3,096

fmcsa-violations
Top Carriers with 393.79 Violations
#CarrierUSDOT# Violations
#1EBI TRANSFERS SA DE CV318798727
#2FEDERAL EXPRESS CORPORATION8687626
#3JESUS MA VALDEZ GARCIA253478423
#4MULTISERVICIOS EXPRESS DEL NORESTE SA DE CV86337921
#5PEDRO ESPINO DIAZ293783618
#6CASTELO LOGISTICS SA DE CV257750118
#7SANDRA PATRICIA CASANOVA GUILLEN92558116
#8FLETES INTERNACIONALES BALO SA DE CV55885514
#9ARTEMIO VILLARREAL DEL BOSQUE205597911
#10TRANSPORTES BRAVO SA DE CV194174210
#11MARIA DEL ROSARIO GARCIA ARAGUZ411501110
#12NICOLAS FLORES BENAVIDES289401710
#134G TRANSFER US-MEX SA DE CV282865110
#14AUTOTRANSPORTES VARELA DAVILA SA DE CV17168249
#15TRANSPORTE INTERNACIONAL LOPEZ OCHOA SA DE C V10419079
#16MIGUEL ANGEL VAZQUEZ MELENDEZ39344569
#17NEW JERSEY TRANSIT CORPORATION742939
#18CARLOS ALBERTO ALANIS REYES23809449
#19JOSE ALFREDO JIMENEZ CAMACHO35867929
#20MARTHA LIZETH ESPINO DIAZ41431449
#21FLETERA INTERNACIONAL ELGO SA DE CV5564299
#22ISABEL CRISTINA PEREZ GARCIA40700759
#23SAN DIEGO UNIFIED SCHOOL DISTRICT28085608
#24DORA ALICIA GALLEGOS ROMAN16500058
#25UNITED PARCEL SERVICE INC218008

Recent Inspections

Latest inspections where 393.79 was cited • 4,065 total events • Page 1 of 163

Recent Inspections with 393.79

Showing 25 of 4,065

fmcsa-inspections
Recent Inspections with 393.79
DateReport #StateLevelOOS
Apr 1, 202687488375TXLevel 2No
Apr 1, 202687488376TXLevel 2No
Apr 1, 202687483370FLLevel 1No
Apr 1, 202687483172COLevel 2No
Apr 1, 202687483757AZLevel 1No
Apr 1, 202687488374TXLevel 2No
Mar 31, 202687479458TXLevel 2No
Mar 31, 202687479839TXLevel 2No
Mar 31, 202687473389AZLevel 2No
Mar 31, 202687478971TXLevel 1No
Mar 31, 202687487320TXLevel 1No
Mar 30, 202687479807TXLevel 1No
Mar 30, 202687479734TXLevel 1No
Mar 30, 202687479578TXLevel 1No
Mar 30, 202687468493TXLevel 2No
Mar 30, 202687466744TXLevel 2No
Mar 30, 202687467023TXLevel 2No
Mar 30, 202687478865TXLevel 1No
Mar 30, 202687455615AZLevel 2No
Mar 29, 202687447817AZLevel 2No
Mar 28, 202687434411AZLevel 2No
Mar 27, 202687412778CTLevel 1No
Mar 27, 202687430007AZLevel 2No
Mar 27, 202687467130TXLevel 2No
Mar 27, 202687441338TXLevel 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
ToolSearch Carriers
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