TruckCodex

393.55D1 — Coupling device/towing methods defective

FMCSA violation code under Vehicle Maintenance. 4,804 events recorded in roadside inspections. Severity weight: 8.

Severity Weight
8
OOS Eligible
No
BASIC Category
Vehicle Maintenance
Total Events
4,804
Code
393.55D1
Code System
FMCSR
BASIC Category
Vehicle Maintenance
OOS Eligible
No
Severity Weight
8
Violation Group
—
Total Events
4,804
Carriers Cited
3,580

Violation Description

Coupling devices or towing methods on commercial motor vehicle are defective or inadequate.

About This Violation Code

Code 393.55D1 falls under the Vehicle Maintenance BASIC category in FMCSA's Safety Measurement System (SMS). It carries a severity weight of 8 (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 393.55D1 in the Federal Motor Carrier Safety Regulations.

View on eCFR.gov →FMCSA Violations Search →
Events (all time)
4,804
OOS Events
16
OOS Rate
0.3%
Top State (180d)
Texas
1,252 events

Top Enforcing States

Where 393.55D1 is most commonly cited (last 180 days)

1.Texas
1,252
OOS 1.2%
2.Iowa
40
OOS 0.0%
3.Illinois
24
OOS 0.0%
4.North Carolina
3
OOS 0.0%
5.New Mexico
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 393.55D1 citations. Red bars mark months with OOS-triggering citations.

111
Apr
248
May
233
Jun
322
Jul
291
Aug
258
Sep
334
Oct
196
Nov
208
Dec
239
Jan
270
Feb
263
Mar
4
Apr

Most Active Stations

Inspection stations citing 393.55D1 most often (last 180 days)

1.SH-0225 IN HARRIS CO. (686-700
82
OOS 3.7%
2.US77 RIVIERA SCALE
50
OOS 0.0%
3.VETERANS POE
39
OOS 0.0%
4.COLUMBIA POE
39
OOS 0.0%
5.IH-0035W IN JOHNSON CO. (16-37
36
OOS 0.0%
6.SH-0146 IN HARRIS CO. (482-500
34
OOS 5.9%
7.IH-0030 IN DALLAS CO. (32-64)
34
OOS 0.0%
8.IH-0635 IN DALLAS CO. (0-35)
28
OOS 0.0%
9.IH-0820 IN TARRANT CO. (0-34)
26
OOS 0.0%
10.IH-0610 IN HARRIS CO. (0-37)
19
OOS 0.0%

Often Cited Together

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

393.9419 co-occurrences392.2RG221 co-occurrences393.47E182 co-occurrences393.78170 co-occurrences396.17C159 co-occurrences393.45B2UV143 co-occurrences392.2W135 co-occurrences396.5B108 co-occurrences393.53B107 co-occurrences393.1198 co-occurrences

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

Top Carriers Cited

Ranked by frequency • 3,580 carriers total • Page 1 of 144

Top Carriers with 393.55D1 Violations

Showing 25 of 3,580

fmcsa-violations
Top Carriers with 393.55D1 Violations
#CarrierUSDOT# Violations
#1WASTE MANAGEMENT OF TEXAS INC38608348
#2EVANS DELIVERY COMPANY INC3811129
#3GULF WINDS INTERNATIONAL INC69014725
#4TEXAN CONCRETE ENTERPRISE READY MIX INC211083821
#5BFI WASTE SERVICES OF TEXAS LP96208517
#6WASTE CONNECTIONS LONE STAR INC84018314
#7REPUBLIC WASTE SERVICES OF TEXAS LTD77240712
#8VELEZ ENVIRONMENTAL SERVICES LLC24806359
#9NATIONAL DRAYAGE SERVICES DE LLC17470939
#10SMYRNA READY MIX CONCRETE LLC17389049
#11ALLIED WASTE SYSTEMS INC2379979
#12MARITIME SERVICES LTD3375879
#13STG DRAYAGE LLC6881438
#14TEXAS PRIDE DISPOSAL SOLUTIONS LLC24255888
#15CEMEX CONSTRUCTION MATERIALS HOUSTON LLC28123848
#16CORTES TRUCKING SERVICES TX LLC19417857
#17W W ROWLAND TRUCKING COMPANY LLC2136417
#18CLARK FREIGHT LINES INC3653707
#19ALAMO CONCRETE PRODUCTS COMPANY19441136
#20NSS TRUCKING SERVICES LLC33679476
#21JOSE G RODRIGUEZ30084886
#22TEXCON HOLDINGS INC29403036
#23TRANSPORTES REFRIGERADOS GC XPRESS SA DE CV25638036
#24MAINLAND CONCRETE INC19881926
#25ESTRADA READY MIX CONCRETE LLC29916836

Recent Inspections

Latest inspections where 393.55D1 was cited • 4,804 total events • Page 1 of 193

Recent Inspections with 393.55D1

Showing 25 of 4,804

fmcsa-inspections
Recent Inspections with 393.55D1
DateReport #StateLevelOOS
Apr 1, 202687487053TXLevel 1No
Apr 1, 202687487929TXLevel 1No
Apr 1, 202687487886TXLevel 1No
Apr 1, 202687487885TXLevel 1No
Mar 31, 202687487848TXLevel 2No
Mar 28, 202687466406TXLevel 2No
Mar 28, 202687441655TXLevel 2No
Mar 28, 202687441656TXLevel 2No
Mar 27, 202687441577TXLevel 2No
Mar 27, 202687468337TXLevel 1No
Mar 27, 202687466826TXLevel 2No
Mar 27, 202687466732TXLevel 2No
Mar 27, 202687466731TXLevel 1No
Mar 27, 202687453204IALevel 1No
Mar 27, 202687466533TXLevel 2No
Mar 27, 202687453305IALevel 2No
Mar 27, 202687466456TXLevel 2No
Mar 26, 202687442903TXLevel 2No
Mar 26, 202687440952TXLevel 1No
Mar 26, 202687440793TXLevel 1No
Mar 26, 202687440974TXLevel 2No
Mar 26, 202687441229TXLevel 2No
Mar 26, 202687487846TXLevel 1No
Mar 26, 202687466449TXLevel 1No
Mar 26, 202687440836TXLevel 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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