TruckCodex

393.83D — Improper exhaust - Bus (Powered by other than Gasoline)

FMCSA violation code under Vehicle Maintenance. 43 events recorded in roadside inspections. Severity weight: N/A.

Severity Weight
N/A
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
43
Code
393.83D
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
N/A
Violation Group
—
Total Events
43
Carriers Cited
27

Violation Description

Improper exhaust - Bus (Powered by other than Gasoline)

About This Violation Code

Code 393.83D 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 393.83D in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
43
OOS Events
22
OOS Rate
51.2%
Top State (180d)
Texas
11 events

Top Enforcing States

Where 393.83D is most commonly cited (last 180 days)

1.Texas
11
OOS 36.4%
2.Illinois
2
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 393.83D citations. Red bars mark months with OOS-triggering citations.

6
May
1
Jul
4
Aug
1
Sep
1
Oct
2
Nov
3
Jan
7
Mar

Most Active Stations

Inspection stations citing 393.83D most often (last 180 days)

1.LINCOLN JUAREZ POE
7
OOS 28.6%
2.1932 TOWNSLEY LANE, CASEYVILLE
1
OOS 100.0%
3.1000 COWBOYS WAY
1
OOS 0.0%
4.HIDALGO POE
1
OOS 100.0%
5.US77 RIVIERA SCALE
1
OOS 0.0%

Often Cited Together

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

396.5B7 co-occurrences392.2RG1 co-occurrences393.111 co-occurrences393.201A1 co-occurrences393.207A1 co-occurrences391.11B2-Z1 co-occurrences393.55B1 co-occurrences393.781 co-occurrences393.9T1 co-occurrences396.3A1B1 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 27 carriers total • Page 1 of 2

Top Carriers with 393.83D Violations

Showing 25 of 27

fmcsa-violations
Top Carriers with 393.83D Violations
#CarrierUSDOT# Violations
#1TORNADO BUS COMPANY56585911
#2ALL VALLEY CHARTERS LLC27812362
#3TRANSPORTES REGIOMONTANOS INC12505872
#4JUAN RAMON MORALES MENDOZA38802002
#5JOSE LUIS GUTIERREZ31189302
#6TURISTICA MERLO INC32770712
#7FLO CHARTER LLC36519142
#8VANDALIA BUS LINES INC783311
#9ESCAMILLA TOUR BUSES LLC10177401
#10LILY'S BUS LINES INC34218071
#11PRIME EXECUTIVE TRANSPORTATION LLC30395261
#12AUTOBUSES EJECUTIVOS LLC10445211
#13DOS NACIONES INC7659121
#14ED'S PARTY BUS LLC29083601
#15G4S SECURE SOLUTIONS USA INC11304621
#16JC LOMER LLC37175301
#17ISAMEX PLUS LLC39860071
#18TRANSPORTES CHAYO INC9927071
#19AZTECAS DE JUVENTINO ROSAS LLC14384851
#20AUTOBUSES NORTESUR LLC43712761
#21PROSPERITY TRAVELS INC25340711
#22ALL ABOUT YOU LIMOS LLC16099761
#23MARIA L VILLAFRANCO13789821
#24NORTENO EXPRESS LLC29290801
#25GREYHOUND LINES MEXICO S DE RL DE CV25127371

Recent Inspections

Latest inspections where 393.83D was cited • 43 total events • Page 1 of 2

Recent Inspections with 393.83D

Showing 25 of 43

fmcsa-inspections
Recent Inspections with 393.83D
DateReport #StateLevelOOS
Mar 28, 202687442683TXLevel 1Yes
Mar 27, 202687443175TXLevel 1Yes
Mar 19, 202687386295TXLevel 1No
Mar 19, 202687396728TXLevel 1No
Mar 18, 202687333814ILLevel 5Yes
Mar 17, 202687334482TXLevel 1No
Mar 5, 202687225741ILLevel 5Yes
Jan 30, 202686967885TXLevel 1No
Jan 17, 202686840426TXLevel 1Yes
Jan 17, 202686844305TXLevel 1Yes
Nov 18, 202586406566TXLevel 1No
Nov 3, 202586245857TXLevel 1No
Oct 31, 202586246472TXLevel 1No
Sep 18, 202585841873TXLevel 1No
Aug 22, 202585598703TXLevel 1Yes
Aug 22, 202585598694TXLevel 1Yes
Aug 22, 202585598704TXLevel 1Yes
Aug 14, 202585545078TXLevel 1No
Jul 30, 202585374605TXLevel 1No
May 22, 202584789717TXLevel 1Yes
May 21, 202584768183TXLevel 1Yes
May 20, 202584768268TXLevel 1Yes
May 9, 202584744678TXLevel 1No
May 6, 202584645952TXLevel 1No
May 6, 202584646014TXLevel 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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