TruckCodex

393.80 — Exhaust system defective

FMCSA violation code under Vehicle Maintenance. 1,693 events recorded in roadside inspections. Severity weight: 4.

Severity Weight
4
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
1,693
Code
393.80
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
4
Violation Group
BASIC 5
Total Events
1,693
Carriers Cited
1,568

Violation Description

Exhaust system on commercial motor vehicle is leaking, not properly secured, or discharging below the floor of the vehicle.

About This Violation Code

Code 393.80 falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 4 (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 393.80 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
1,693
OOS Events
7
OOS Rate
0.4%
Top State (180d)
Texas
18 events

Top Enforcing States

Where 393.80 is most commonly cited (last 180 days)

1.Texas
18
OOS 0.0%
2.Illinois
15
OOS 0.0%
3.New Mexico
10
OOS 0.0%
4.North Carolina
3
OOS 0.0%
5.Iowa
2
OOS 0.0%
6.Kentucky
1
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 393.80 citations. Red bars mark months with OOS-triggering citations.

5
Apr
9
May
9
Jun
9
Jul
12
Aug
9
Sep
10
Oct
10
Nov
8
Dec
3
Jan
13
Feb
10
Mar

Most Active Stations

Inspection stations citing 393.80 most often (last 180 days)

1.PHARR POE
4
OOS 0.0%
2.COLUMBIA POE
4
OOS 0.0%
3.80
2
OOS 0.0%
4.39
2
OOS 0.0%
5.TOW YARD
2
OOS 0.0%
6.I-90 E/B MP 3
1
OOS 0.0%
7.I-90
1
OOS 0.0%
8.LOUISVILLE
1
OOS 0.0%
9.I-74 WB
1
OOS 0.0%
10.N/A
1
OOS 0.0%

Often Cited Together

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

393.914 co-occurrences396.3A110 co-occurrences393.75C8 co-occurrences396.5B6 co-occurrences393.116 co-occurrences393.785 co-occurrences393.75A5 co-occurrences392.2RG5 co-occurrences393.60C5 co-occurrences393.47E4 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 1,568 carriers total • Page 1 of 63

Top Carriers with 393.80 Violations

Showing 25 of 1,568

fmcsa-violations
Top Carriers with 393.80 Violations
#CarrierUSDOT# Violations
#1NEW JERSEY TRANSIT CORPORATION7429312
#2WESTERN EXPRESS INC5114129
#3UNITED PARCEL SERVICE INC218007
#4J B HUNT TRANSPORT INC808065
#5FEDERAL EXPRESS CORPORATION868765
#6SWIFT TRANSPORTATION CO OF ARIZONA LLC542834
#7OLD DOMINION FREIGHT LINE INC908494
#8RHS1 LLC29672033
#9NEW PRIME INC37063
#10US XPRESS INC3030243
#11BELLEROSE TRUCKING INC35376423
#12P A LANDERS INC8051813
#13XING RONG EXPRESS INC21831053
#14AUTO TRUCK TRANSPORT USA LLC3171063
#15DFA DAIRY BRANDS DISTRIBUTING NORTH LLC34211783
#16BENNETT TRUCK TRANSPORT LLC6003823
#17XPO LOGISTICS FREIGHT INC2418293
#18WERNER ENTERPRISES INC534673
#19TFORCE FREIGHT INC1210583
#20AMERICAS AUTO AUCTION HARRISBURG INC3385152
#21SEVEN O SEVEN TRANSPORTATION LLC35662572
#22WALTERS RECYCLING & REFUSE INC14634952
#23FAF LLC7286302
#24SMYRNA READY MIX CONCRETE LLC17389042
#25AJS TRUCKING LLC33823222

Recent Inspections

Latest inspections where 393.80 was cited • 1,693 total events • Page 1 of 68

Recent Inspections with 393.80

Showing 25 of 1,693

fmcsa-inspections
Recent Inspections with 393.80
DateReport #StateLevelOOS
Mar 29, 202687465025NMLevel 2No
Mar 24, 202687440934TXLevel 1No
Mar 20, 202687353500NMLevel 2No
Mar 18, 202687396775TXLevel 1No
Mar 17, 202687372116ILLevel 1No
Mar 13, 202687290626NCLevel 2No
Mar 12, 202687385581TXLevel 1No
Mar 10, 202687372330ILLevel 1No
Mar 6, 202687224638NCLevel 2No
Mar 1, 202687189827NMLevel 2No
Feb 25, 202687149813NMLevel 2No
Feb 24, 202687167036TXLevel 1No
Feb 21, 202687192249TXLevel 2No
Feb 17, 202687101014ILLevel 1No
Feb 13, 202687078594ILLevel 1No
Feb 9, 202687009125TXLevel 1No
Feb 8, 202687005703NMLevel 2No
Feb 6, 202687067300TXLevel 2No
Feb 6, 202687008682TXLevel 1No
Feb 6, 202687006140IALevel 3No
Feb 4, 202687078545ILLevel 2No
Feb 4, 202686980406TXLevel 1No
Feb 2, 202686947064ILLevel 2No
Jan 19, 202686883325ILLevel 1No
Jan 15, 202686817496NMLevel 2No

Data sources & freshness

FMCSA Vehicle Inspections and Violations
Updated 3 months ago
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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