393.50B — Steering mechanism defective
FMCSA violation code under Vehicle Maintenance. 53 events recorded in roadside inspections. Severity weight: 8.
Violation Description
Steering mechanism on commercial motor vehicle is defective, broken, or not functioning properly.
About This Violation Code
Code 393.50B 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 393.50B in the Federal Motor Carrier Safety Regulations.
Top Enforcing States
Where 393.50B is most commonly cited (last 180 days)
Click a state to see roadside inspection activity, top stations, and carrier profiles in that jurisdiction.
Citation Trend (12 months)
Monthly count of 393.50B citations. Red bars mark months with OOS-triggering citations.
Most Active Stations
Inspection stations citing 393.50B most often (last 180 days)
Often Cited Together
Other violations commonly found on the same inspection (last 90 days)
Citation patterns suggest related root causes (e.g., HOS violations paired with logbook errors).
Top Carriers Cited
Ranked by frequency • 51 carriers total • Page 1 of 3
Top Carriers with 393.50B Violations
Showing 25 of 51
| # | Carrier | USDOT | # Violations |
|---|---|---|---|
| #1 | TOP FLIGHT TRUCKING & LOGISTICS LLC | 2285028 | 2 |
| #2 | RAUL CASTRO | 3191825 | 2 |
| #3 | SALVADOR ARAGON | 2205670 | 1 |
| #4 | ODILON GONZALEZ | 1662164 | 1 |
| #5 | P H CONCRETE CORPORATION | 2891019 | 1 |
| #6 | TWISTER WASTE INC | 2006971 | 1 |
| #7 | SAMUEL ANGULO | 1961206 | 1 |
| #8 | ANDERSON POLLUTION CONTROL INC | 1939963 | 1 |
| #9 | STEPHENS UNLIMITED LLC | 2975210 | 1 |
| #10 | DECKER J DISPOSAL INC | 2047141 | 1 |
| #11 | EAZY TRANS LLC | 2825926 | 1 |
| #12 | LINDSEY LOGISTICS LLC | 4232468 | 1 |
| #13 | JESUS SAENZ | 2936786 | 1 |
| #14 | CTT CALDERON TRUCK TRANSPORT LLC | 3090194 | 1 |
| #15 | GREENS BLUE FLAME GAS CO INC | 1177528 | 1 |
| #16 | JM LOGISTICS TRUCK SERVICE LLC | 4465121 | 1 |
| #17 | MARTIN RIOS | 1948887 | 1 |
| #18 | SMYRNA READY MIX CONCRETE LLC | 1738904 | 1 |
| #19 | NONE GLZ TRUCKING LLC | 4301058 | 1 |
| #20 | CITY RANCH TRANSPORT LLC | 4142326 | 1 |
| #21 | JOSEPH MCMAHON DAIRY SERVICE INC | 2271487 | 1 |
| #22 | EDSON TRUCKING LLC | 4290371 | 1 |
| #23 | JOEL SOSA | 2559163 | 1 |
| #24 | WENDY ESPERANZA GAITAN | 4070870 | 1 |
| #25 | MA OLMOS TRUCKING LLC | 3786822 | 1 |
Recent Inspections
Latest inspections where 393.50B was cited • 53 total events • Page 1 of 3
Recent Inspections with 393.50B
Showing 25 of 53
| Date | Report # | State | Level | OOS |
|---|---|---|---|---|
| Mar 26, 2026 | 87466629 | TX | Level 2 | No |
| Mar 25, 2026 | 87466179 | TX | Level 2 | No |
| Mar 18, 2026 | 87467216 | TX | Level 2 | No |
| Mar 17, 2026 | 87466156 | TX | Level 1 | No |
| Mar 4, 2026 | 87314319 | TX | Level 1 | No |
| Feb 26, 2026 | 87191486 | TX | Level 1 | No |
| Feb 11, 2026 | 87151446 | TX | Level 2 | No |
| Feb 3, 2026 | 87007793 | TX | Level 2 | No |
| Jan 15, 2026 | 86948417 | TX | Level 1 | No |
| Jan 14, 2026 | 86948210 | TX | Level 2 | No |
| Jan 6, 2026 | 86948283 | TX | Level 1 | No |
| Dec 18, 2025 | 86728412 | TX | Level 1 | No |
| Dec 17, 2025 | 86728345 | TX | Level 2 | No |
| Nov 25, 2025 | 86461268 | TX | Level 2 | No |
| Nov 18, 2025 | 86461193 | TX | Level 1 | No |
| Nov 5, 2025 | 86363877 | TX | Level 1 | No |
| Oct 23, 2025 | 86235883 | TX | Level 1 | No |
| Oct 15, 2025 | 86109476 | TX | Level 1 | No |
| Oct 9, 2025 | 86071617 | TX | Level 2 | No |
| Oct 7, 2025 | 86071688 | TX | Level 2 | No |
| Sep 16, 2025 | 86071111 | TX | Level 2 | No |
| Sep 10, 2025 | 86072026 | TX | Level 1 | No |
| Sep 4, 2025 | 86071283 | TX | Level 1 | No |
| Aug 27, 2025 | 85673239 | TX | Level 2 | No |
| Aug 26, 2025 | 86072019 | TX | Level 1 | No |