FMCSR 393.17: Lamps and Reflectors — Driver Q&A

Yes, there's a high risk. Across our 13 million inspection records, 393.17 citations resulted in an out-of-service (OOS) rate of 87.2% — far above the 31.4% average across all FMCSR codes. Of the 258 all-time citations for inadequate lamps or reflectors in our database, 225 resulted in immediate out-of-service placement. If you're cited, assume you'll be sidelined until the lamps or reflective equipment meet federal standards.

A single 393.17 citation carries a CSA severity weight of 3 points. Under the CSA Safety Management Cycle, that single violation is counted once per 30-day period, so one citation = 3 points in your Safety Management Cycle window. The weight reflects the safety importance of proper lighting and reflectors—defects significantly increase crash and visibility risk.

First, do not operate the vehicle further until lamps and reflectors are repaired and conform to FMCSR standards. Request re-inspection from the enforcement officer or return to a certified repair facility immediately. Our data shows 393.17 often co-occurs with other equipment defects (we see it paired with fifth wheel issues in recent inspections), so have a full vehicle walk-around before re-inspection. Keep repair receipts as proof of compliance.

Yes. While 393.17 itself is not OOS-eligible under the code definition, the 87.2% observed OOS rate indicates inspectors are placing vehicles out of service due to the severity of the defect. Compare this to 393.9 (Inoperable Required Lamp), which has 660,737 citations with a 15.4% OOS rate, or 393.11 (Lighting Devices/Reflectors) at 179,734 citations with a 1.8% OOS rate. Our inspection records show that 393.17 defects tend to be more serious than related lighting codes.

Yes. If you believe the citation was issued in error—for example, if lamps were actually compliant at the time of inspection or the inspector misidentified the equipment—you can file a DataQs (FMCSA Roadside Examination Dispute Resolution) challenge within 90 calendar days. Equipment-based citations like 393.17 are contestable if you can demonstrate the violation did not exist. Consult your carrier's safety or compliance team for the formal submission process.

Over the last 180 days, our records show citations concentrated in North Carolina (1 citation, 100% OOS rate) and Texas (1 citation, 0% OOS rate). Overall, 393.17 ranks #1137 of 3,036 FMCSR codes by total citation volume—it's a relatively uncommon violation across the country. This means when you are cited, it signals a genuinely deficient vehicle condition that inspectors flagged as a priority safety issue.

Extremely urgent. In the last 12 months, our database shows only 7 citations for 393.17, and across the last 90 days just 1 citation—yet the historical OOS rate remains 87.2%, meaning nearly all citations result in immediate vehicle placement out of service. Monthly trends confirm that whenever this violation is cited, an OOS outcome is highly likely. Repair must happen before re-inspection; there is no grace period.

Both. The citation is recorded against the carrier's USDOT number and appears in their Safety Management Cycle and CSA score. As the driver, the violation may also be linked to your record under your commercial driver's license. Vehicle Maintenance violations under FMCSR 393.17 fall within the Vehicle Maintenance BASIC, which affects both driver and carrier metrics. Repeat citations across your fleet or record can trigger FMCSA compliance reviews or audit recommendations.