FMCSR 393.11 Lighting Devices/Reflectors: Driver Q&A

Almost certainly not — but it has happened. Across 179,734 all-time citations for 393.11, our inspection records show an out-of-service rate of just 1.8% (3,282 vehicles placed OOS). That's dramatically lower than the all-FMCSR average of 31.4%. The code is also flagged OOS-ineligible as a standalone violation, meaning inspectors need additional factors — typically a near-total lighting failure — to pull you. In 176,452 of those inspections, the driver kept rolling. Fix the deficiency before your next trip anyway; co-occurring violations on the same inspection are a different story.

A 393.11 citation carries a CSA severity weight of 3. That base number is then multiplied by a time-weighting factor: violations in the most recent 6 months count at 3×, months 7–12 count at 2×, and anything older than 12 months counts at 1×. So a fresh citation effectively adds 9 weighted points to your Vehicle Maintenance BASIC score. Because 393.11 is ranked #9 out of 3,036 FMCSR codes by citation volume — with 24,811 citations in just the last 12 months — inspectors actively look for it, making prevention worth the effort.

Immediately after the citation, do these things in order:

1. Document the defect. Photograph every lamp and reflector on the unit before any repair.
2. Check for companion violations. Our records show that in the last 90 days, 393.11 appeared alongside 393.9 (Inoperable Required Lamp) in 1,998 shared inspections and with 393.78 (Windshield defective) in 1,082. Review your full inspection report — a second open violation can change your OOS exposure.
3. Complete repairs and get a signed roadside correction (if the inspection report allows it) or a shop invoice before your next dispatch.
4. Report the repair to your safety manager so the carrier's BASIC scores can be monitored for any DataQs action.

It's serious by volume, less so by severity. Our inspection records show 393.11 is cited #9 out of 3,036 FMCSR codes overall, which signals inspectors treat lighting as a high-priority check. But its 1.8% OOS rate looks mild next to the closest peer code, 393.9(a) (Inoperable required lamps), which carries a 15.4% OOS rate across 660,737 citations. Another peer, 396.3(a)(1) (general inspection/repair/maintenance), hits 45.3% OOS across 236,919 citations. The 1.8% figure means 393.11 is unlikely to ground you alone — but the citation volume means it feeds your CSA score at scale.

Yes, you can submit a Request for Data Review (RDR) through FMCSA's DataQs system. Because 393.11 is an equipment violation, not a documentation violation, a successful challenge typically requires evidence that the cited lamp or reflector was actually functional at the time of inspection — shop records, timestamped photos, or a driver vehicle inspection report (DVIR) made before the stop are your strongest tools. DataQs won't erase a valid finding, but if the inspector cited the wrong code, the wrong vehicle unit, or a defect that didn't exist, the RDR process can correct the record and remove the citation from your SMS profile.

Texas dominates by a wide margin. In the last 180 days, our inspection records show Texas issued 11,187 citations for 393.11 — the highest of any state in the dataset. Illinois was a distant second at 280 citations, followed by Iowa at 249. New Mexico rounds out the notable states at 189 citations but stands out for its 7.4% OOS rate, the second-highest in the data. If your lanes run through Texas in particular, treat every pre-trip lighting check as non-negotiable — more than 11,000 citations in 180 days means inspectors there are actively writing this code.

Don't wait. Our inspection data shows 393.11 is generating 5,654 citations in just the last 90 days, averaging roughly 1,885 citations per month — and the 12-month trend shows consistent enforcement above 2,000 citations per month since May 2025. While the 1.8% OOS rate means you're unlikely to be parked at the roadside, each unfixed citation adds CSA severity-weight points that accumulate over 24 months. Fleets with unresolved lighting defects also tend to attract re-inspection attention. A bulb or reflector fix at a truck stop takes minutes; a CSA score correction takes months.

Both are affected, but in different ways. Under FMCSA's CSA model, 393.11 falls under the Vehicle Maintenance BASIC, which is scored at the carrier level — so the citation primarily moves the carrier's SMS percentile. However, the inspection record is tied to your driver record as well. If you drive for multiple carriers, or if FMCSA ever expands driver-level scoring, those records follow you. For now, the practical impact lands hardest on the carrier: our records show top-cited carriers accumulating hundreds of 393.11 citations over time, with the highest reaching 474 citations (VRP Transportes de Mexico, USDOT 662058).