TruckCodex

393.83(c) — Improper exhaust - Bus (Powered by gasoline)

FMCSA violation code under Vehicle Maintenance. 238 events recorded in roadside inspections. Severity weight: N/A.

Severity Weight
N/A
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
238
Code
393.83(c)
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
N/A
Violation Group
—
Total Events
238
Carriers Cited
152

Violation Description

Improper exhaust - Bus (Powered by gasoline)

About This Violation Code

Code 393.83(c) 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 393.83 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
238
OOS Events
207
OOS Rate
87.0%
Top State (180d)
—

Top Carriers Cited

Ranked by frequency • 152 carriers total • Page 1 of 7

Top Carriers with 393.83(c) Violations

Showing 25 of 152

fmcsa-violations
Top Carriers with 393.83(c) Violations
#CarrierUSDOT# Violations
#1ZUM SERVICES INC337352334
#2SAN DIEGO UNIFIED SCHOOL DISTRICT28085606
#3THE GROWERS COMPANY INC7181185
#4FIRST STUDENT INC3544065
#5ARROWHEAD ECONOMIC OPPORTUNITY AGENCY INC9399685
#6ECHOING HILLS VILLAGE INC25933294
#7LOS ANGELES UNIFIED SCHOOL DISTRICT28076104
#8AFFORDABLE TOURS AND TRANSPORTATION INC20573824
#9HEAVENLY COACH LLC39277163
#10INNER CITY TRANSIT LLC7460993
#11BIRMINGHAM INVESTMENTS LLC10856933
#12EMPOWERING PEOPLE WORKSHOP INC24241283
#13HATTIE LARLHAM29394382
#14FIRST TRANSIT INC10022112
#15I AM BOUNDLESS INC32592142
#16ICE HOUSE LIMOUSINE SERVICE INC14470472
#17ELKHORN PACKING CO LLC9097952
#18PECORARO LIMOUSINES LLC15084112
#19JOHN R MARTIN42515652
#20ARIES CHARTER TRANSPORTATION INC6936142
#21COMMUNITY HOSPITAL OF THE MONTEREY PENINSULA26542512
#22RURAL TRANSIT ENTERPRISES COORDINATED INC6913932
#23ARODS TRANSPORTATION LLC37875002
#24SOCIETY FOR HANDICAPPED CITIZENS OF MEDINA COUNTY INC33287522
#25LED EXECUTIVE SERVICES LLC28428892

Recent Inspections

Latest inspections where 393.83(c) was cited • 238 total events • Page 1 of 10

Recent Inspections with 393.83(c)

Showing 25 of 238

fmcsa-inspections
Recent Inspections with 393.83(c)
DateReport #StateLevelOOS
Oct 11, 202482902394CALevel 5Yes
Oct 9, 202482873048MOLevel 5Yes
Oct 9, 202482867579KYLevel 1Yes
Oct 9, 202482892565OHLevel 5Yes
Oct 3, 202482846249MALevel 5Yes
Sep 24, 202482872199CALevel 5Yes
Sep 19, 202482713904MALevel 2Yes
Sep 16, 202482678478MOLevel 5Yes
Sep 16, 202482822483USLevel 1Yes
Sep 16, 202482724842MOLevel 5Yes
Sep 13, 202482674146CALevel 5Yes
Sep 13, 202482674148CALevel 5Yes
Sep 13, 202482674147CALevel 5Yes
Sep 10, 202482629783MDLevel 5No
Sep 6, 202482658036CALevel 5Yes
Sep 4, 202482599480CALevel 5Yes
Sep 4, 202482797041CALevel 5No
Sep 4, 202482797030CALevel 5No
Sep 4, 202482797031CALevel 5No
Sep 4, 202482797032CALevel 5No
Aug 30, 202482657789CALevel 5Yes
Aug 27, 202482808960CALevel 5Yes
Aug 27, 202482808884CALevel 5Yes
Aug 27, 202482808958CALevel 5Yes
Aug 27, 202482809022CALevel 5Yes

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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