What 393.93B-SBA means in plain language
This citation means an inspector found that your truck or truck-tractor either lacks seatbelts entirely or has seatbelts that are defective and unusable. The regulation requires all trucks and truck-tractors to be equipped with functional seatbelts. Defective means broken, frayed, unable to fasten, or otherwise not in working condition.
This is a vehicle maintenance issue, not a driver behavior citation. You cannot fix it by simply fastening your belt—the belt itself or its attachment hardware must be repaired or replaced. If your truck failed inspection, the equipment must be restored to working order before the vehicle can legally operate.
What our enforcement data actually shows
Across our inspection records of 13 million roadside inspections, we have documented 358 all-time citations for 393.93B-SBA. In the last 12 months, there were 206 citations, and in the last 90 days, 35 citations. This code ranks 1029th out of 3,036 FMCSR codes by citation volume—a relatively uncommon violation.
Critically: none of the 358 citations in our database resulted in an out-of-service order. The 0.0% OOS rate for this code is far below the all-FMCSR average of 31.4%, meaning inspectors typically issue warnings or non-critical citations rather than removing trucks from service. This reflects that seatbelt defects, while requiring repair, are usually not deemed unsafe enough to immediately ground a vehicle.
The monthly trend shows variability. In the last 12 months, citations peaked at 28 in May 2025 and dropped to just 2 in April 2026, suggesting enforcement is sporadic and may be tied to seasonal inspection cycles or regional focus periods.
Who gets cited most
Our data from the last 180 days shows the largest concentration of 393.93B-SBA citations in California, with 16 citations and a 0.0% OOS rate. Pennsylvania follows with 6 citations (0.0% OOS), and Puerto Rico with 4 citations (0.0% OOS). Across all top states in our sample—including Missouri, Georgia, New Jersey, Florida, Arizona, and Colorado—the OOS rate remains uniformly at 0%, confirming that this violation is not typically a grounds for immediate removal from service in any jurisdiction.
Among carriers in our all-time data, our records show fleets such as Octavio Andrade Corella (USDOT 558440) with 7 citations and Luis Ernesto Soto Ruiz (USDOT 2872843) with 7 citations appearing most frequently. This pattern does not imply systemic negligence but reflects where inspectors have encountered defective equipment.
How severe is this compared to similar codes
Compared to other vehicle maintenance codes in the same category, 393.93B-SBA is low-frequency and low-severity. For example, 393.9 (Inoperable Required Lamps) has generated 660,737 citations with a 15.4% OOS rate—far more common and more likely to result in removal from service. Similarly, 396.3(a)(1) (Inspection/Repair/Maintenance General) has 236,919 citations and a 45.3% OOS rate, indicating that broader maintenance failures carry higher enforcement priority.
In contrast, 396.17C-PI (No Proof of Periodic Inspection) has 212,081 citations but a 0.0% OOS rate, matching this code's enforcement posture. The pattern suggests that documentation and equipment-present violations are treated as correctable defects, not immediate safety threats warranting vehicle removal.
How to avoid it
To prevent a 393.93B-SBA citation, perform these concrete checks before every trip:
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Before you sit down: Pull and release both seatbelts in the cab and any additional seats in the sleeper. They must fasten smoothly and hold firm under moderate pull. If a belt is slack, torn, or won't click, it is defective.
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Inspect attachment points: Check where seatbelt bolts connect to the truck frame. Look for loose bolts, bent hardware, or cracks around the mounting area. Tighten any loose fasteners immediately.
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Test the retraction mechanism: Modern seatbelts should retract fully when released. If a belt stays out or moves sluggishly, it may be jammed or broken internally and needs repair before operation.
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Check for visible damage: Fraying, cuts, discoloration from heat, or chemical damage mean the belt is unsafe. A single deep cut or burn can cause catastrophic failure in a crash.
Our co-occurring citation data shows that seatbelt equipment defects often appear alongside brake maintenance issues (393.47E — Slack Adjuster Defective) and missing or incomplete vehicle inspection records (396.17C-PI — No Proof of Periodic Inspection). This pattern indicates that vehicles with one maintenance gap often have others. If you discover a defective seatbelt, perform a thorough walk-around inspection of your brake system, lights, and emergency equipment as well.
Freightliner trucks account for 58 of the citations in our database, followed by International (29) and Kenworth (25). If you operate one of these makes, pay extra attention to seatbelt condition at every pre-trip, as these vehicles appear more frequently in inspection records for this violation. Do not defer seatbelt repair—fix it immediately, document the repair, and keep records in your vehicle.