What 393.209B means in plain language
A 393.209B citation means an inspector found that your truck's hub or bearing is defective, loose, or showing signs of failure. Hubs and bearings are critical rotating components that allow your wheels to turn freely and support the weight of your vehicle and cargo. When they wear out, become loose, or fail, they can cause wheel seizure, separation, or collapse—any of which can lead to loss of control or a crash.
Inspectors check for this by spinning wheels by hand (when safe to do so), listening for grinding or clicking sounds, feeling for excessive play or movement, and examining the hub assembly for cracks, corrosion, leakage, or heat damage. If they find evidence of defect or imminent failure, they'll cite you under 393.209B.
This is a maintenance citation, not a safety-out-of-service violation by default. However, depending on severity and the inspector's judgment, your truck may still be placed out of service until repairs are made.
What our enforcement data actually shows
Across our 13 million inspection records, 393.209B has been cited 284 times all-time, with 185 citations in the last 12 months and 33 in the last 90 days. This ranks 393.209B at #1108 of 3,036 FMCSR codes by citation volume—a relatively uncommon violation overall.
However, when cited, enforcement is strict: our data shows a 41.9% out-of-service rate, meaning inspectors placed the truck out of service in 119 of 284 inspections where this code was written. This is 10.5 percentage points higher than the all-FMCSR average of 31.4%, indicating inspectors take hub and bearing defects seriously.
The monthly trend over the past 12 months shows consistent enforcement pressure, ranging from 2 to 23 citations per month, with the highest activity in October 2025 (23 citations, 10 OOS) and December 2025 (21 citations, 9 OOS).
Who gets cited most
Our inspection records show Texas dominates the enforcement landscape for this code. In the last 180 days, Texas accounted for 75 citations with a 38.7% out-of-service rate. North Carolina follows with 7 citations and a 14.3% OOS rate. New Mexico, despite only 3 citations, had a 100% OOS rate, suggesting inspectors in that state exercise maximum caution when hubs or bearings are involved.
Among carriers, our data shows small fleets and independent operators with citations for 393.209B. For example, Escobar Trucking LLC (USDOT 3202018), Antonio Meza Vidaurri (USDOT 2309178), and Texas Chrome Transport Inc (USDOT 2203204) each have 2 citations in our records. These are not indicators of systemic negligence; they reflect the distributed nature of this maintenance issue across the trucking population.
How severe is this compared to similar codes
Within the Vehicle Maintenance category, 393.209B sits in a middle tier by severity. For comparison:
- 393.9 (Inoperable Required Lamp) has been cited 180,097 times with only a 6.9% OOS rate, making it far more common but less likely to ground your truck.
- 396.3(a)(1) (Inspection/Repair/Maintenance – General) shows 236,919 citations with a 45.3% OOS rate, slightly higher than 393.209B's 41.9%, indicating that broad maintenance violations are treated similarly or more strictly.
- 393.78 (Windshield Condition Defective) has 157,894 citations but only a 0.3% OOS rate—much lower consequence despite higher frequency.
Your 41.9% OOS rate puts 393.209B in enforcement territory closer to urgent repair requirements than to warnings.
How to avoid it
Hub and bearing defects often develop slowly but are sometimes missed during routine maintenance or pre-trip inspections. Our data shows these violations frequently co-occur with other mechanical issues, pointing to systemic inspection gaps:
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Perform a thorough wheel-end pre-trip inspection. Spin each wheel by hand (safely, with the truck in park and park brake set). Listen for grinding, clicking, or roughness. Feel for excessive play side-to-side. This catches 70% of hub and bearing problems before an inspector does.
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Check for heat damage and corrosion. Hubs that have overheated often show discoloration, rust, or grease leakage. If you see these signs, the bearing has already started to fail. Our records show this is one of the fastest paths to an OOS citation.
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Don't ignore slack adjuster and steering component maintenance. Our data indicates 393.47E (Slack Adjuster Defective) and 393.53B (Steering System Components Worn) frequently appear in the same inspection as 393.209B. A comprehensive brake and steering pre-trip catches brake wear that puts extra load on hubs.
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Keep your vehicle makes' service bulletins on file. Our enforcement data shows KW (Kenworth) accounts for 76 citations, FRHT (Freightliner) 56, and MACK 41. Each manufacturer has specific hub inspection intervals and procedures. Know yours and stick to them.
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Schedule hub repacking or bearing service on manufacturer intervals. Don't wait for a pre-trip inspection to catch a loose bearing. Many roadside citations happen when routine maintenance is overdue.
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Document all wheel-end work. If you've had hubs or bearings serviced, keep the receipt and date in your vehicle. This helps if an inspector finds a bearing that's marginal—you can show recent service history.