FMCSR 393.91 Citation: What Happens Now

Not automatically. Across our 13 million inspection records, 393.91 is not eligible for out-of-service placement under the current FMCSR standard. However, our data shows that 53.1% of all 393.91 citations still resulted in OOS action—meaning inspectors exercised discretion based on severity or related defects. This OOS rate is 69% higher than the national average across all codes (31.4%), so while the violation itself doesn't trigger mandatory OOS, the underlying condition often does warrant immediate repair.

First: document the specific defect cited and the inspection date. Second: contact your carrier's maintenance department with the citation number and defect details—do not ignore it. Third: schedule repair within 24–48 hours if the violation involved a safety-critical component (lighting, brakes, or structural integrity). Fourth: keep all repair invoices and photos of the corrected defect. If you believe the citation is incorrect or unsupported by evidence, you may request a DataQs review through FMCSA's portal within 90 days of the inspection date.

Our inspection database ranks 393.91 at #1356 out of 3,036 FMCSR codes by citation frequency—making it relatively uncommon. In the same vehicle maintenance category, 393.9(a) (inoperable lamps) has been cited 660,737 times with only a 15.4% OOS rate, while 396.3(a)(1) (general inspection/repair) has 236,919 citations but a 45.3% OOS rate. At 128 all-time citations, 393.91 sits in the lower-volume tier, but its 53.1% OOS rate indicates inspectors treat it as more serious than peer codes in the same category.

Not actively. Our records show zero citations for 393.91 in the last 12 months and zero in the last 90 days, despite 128 all-time citations in the database. This does not mean you are safe from enforcement—it may indicate a shift in inspector focus, a change in the violation's definition, or simply low frequency. Check your state DOT and FMCSA guidance directly for current enforcement priorities in your region.

Our data shows American Transportation Systems (USDOT 1151228) and Kings Canyon Unified School District (USDOT 2607803) each account for 4 citations—the highest in the database. Lutheran Secondary School of Clark County, Shoreline Unified School District, Windstar Lines Inc, and Coach Quarters Entertainment Transportation LLC each have 3 citations. Notably, school districts and motorcoach operators dominate the 393.91 citation list, suggesting the violation may relate to specific fleet types or vehicle configurations common to passenger transport.

The FMCSR code itself does not carry a standardized CSA point value published in our database. CSA scoring depends on the specific BASIC category assigned by FMCSA (Vehicle Maintenance is the most likely category for 393.91) and whether the violation is a safety violation. The severity weight and point multiplier are set by FMCSA policy, not by citation frequency. Contact your carrier's compliance team or your state's enforcement office for the exact points applied to your record—they have access to the CSA scoring lookup table.

Across our records, THMS vehicles account for 13 citations for 393.91—more than twice any other make. BLUB follows with 7 citations. Ford, Motorcoach, Freightliner, Mack, and Prevost each appear 3–5 times. The heavy concentration in commercial bus and motorcoach platforms (THMS, Prevost, Motorcoach, Internatio) reinforces the pattern that 393.91 disproportionately affects passenger transport fleets rather than over-the-road trucking.

Yes. FMCSA's DataQs (Driver Records Readiness) system allows you to challenge inspection findings that you believe are inaccurate, unsupported by evidence, or procedurally flawed. You have 90 days from the inspection date to file. Since 393.91 is typically an equipment or maintenance defect (not a driver behavior violation), a successful DataQs challenge usually requires proving the cited component was not actually defective at the time of inspection—typically through repair receipts, photos, or maintenance logs predating the inspection. Work with your carrier's safety manager to gather supporting documentation before submission.