What 393.17B2-LDCL means in plain language
FMCSR 393.17B2-LDCL addresses a fundamental safety requirement: your commercial vehicle's lamps and reflectors must meet federal standards. This includes brake lights, clearance lights, reflectors, and any other lighting or reflective equipment required by the regulation. If an inspector finds that your lamps or reflectors do not comply with those specifications—whether they're missing, dim, damaged, or improperly positioned—you'll be cited.
This is a straightforward equipment violation. It doesn't typically result in an out-of-service order, but it must be corrected. The inspectors are checking that other drivers can see your vehicle, especially in low-light conditions. A burned-out light or a cracked reflector might seem minor, but it compromises visibility on the road.
What our enforcement data actually shows
Across our 13 million+ inspection records, 393.17B2-LDCL is cited infrequently relative to the universe of FMCSR codes. All-time, we see 150 citations for this violation, ranking it #1300 of 3,036 FMCSR codes by citation volume. In the last 12 months, enforcement volume stands at 93 citations; in the last 90 days, 11 citations.
The most important data point: this code has a 0.0% out-of-service rate across all 150 all-time citations. Not a single vehicle was placed out of service for this violation. This is significantly lower than the all-FMCSR average OOS rate of 31.4%, reflecting that inadequate lamps and reflectors, while a compliance issue, do not typically pose an immediate safety emergency requiring vehicle removal from service.
Looking at monthly trends over the last 12 months, enforcement has been steady but modest. Citations peaked in September 2025 with 13, and have since trended lower, with April 2026 showing just 1 citation.
Who gets cited most
Our inspection records show citation patterns concentrated in a few states. Maryland leads with 16 citations in the last 180 days, followed by California with 8, and Pennsylvania with 4. The remaining top states—Maine, Minnesota, Nebraska, Wisconsin, Florida, and Kansas—each account for 1 citation in that period. Across all these states, the OOS rate remains 0.0%, indicating consistent enforcement posture: cite the violation but do not remove the vehicle.
By carrier, our data shows fleets such as HWS LLC with 8 all-time citations and SILVER SPRING TOWING & RECOVERY LLC with 5 citations. These carriers operate in service classes where lighting violations may occur more frequently, but the citation counts reflect the rarity of this code overall.
How severe is this compared to similar codes
In the Vehicle Maintenance category, 393.17B2-LDCL sits among several related and higher-volume codes. FMCSR 393.9(a), which addresses inoperable required lamps, has generated 660,737 all-time citations with a 15.4% OOS rate—far more severe and frequent. FMCSR 393.11, covering lighting devices and reflectors more broadly, shows 179,734 citations with a 1.8% OOS rate. FMCSR 393.78, addressing windshield condition defects, has 157,894 citations with a 0.3% OOS rate.
The volume disparity illustrates that 393.17B2-LDCL is a narrow, specific citation. When inspectors cite lamps or reflectors as inadequate under this particular code, they are flagging a compliance gap that is less likely to trigger out-of-service action than broader lamp-related violations.
How to avoid it
Based on the co-occurring violations in our data, lamp and reflector defects often cluster with other lighting issues. When you conduct a pre-trip inspection, take these steps:
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Walk the entire perimeter of your vehicle. Check all brake lights, tail lights, clearance lights (marker lights), and reflectors. Look for burned-out bulbs, cracked lenses, and loose or missing reflective tape. This takes five minutes and catches the most common issues.
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Test your lights before dawn or after dusk. Have someone stand behind or beside the vehicle while you activate brakes, turn signals, and hazard lights. A light that looks okay in daylight may be dim or inoperative in darkness.
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Inspect reflectors for damage and visibility. Red reflectors on the rear and amber on the sides should be clean, intact, and securely fastened. Mud, debris, or damage reduces their effectiveness.
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Pay special attention to fifth-wheel equipment. Our data shows that fifth-wheel defect codes co-occur with lighting citations in some inspections. If you're a tractor-trailer driver, ensure marker lights on the trailer are functional and clean.
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Keep spare bulbs and reflective tape on hand. A burned-out bulb can be replaced quickly at a truck stop or rest area. Carrying spares lets you address minor issues before an inspection catches them.
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Document your pre-trip checks. Write down which lights and reflectors you verified. If an inspector later finds a light out that failed after your check, you have a record of your diligence.
Vehicle makes cited most frequently for this violation include Ford (24 citations), Freightliner (12), and Dodge (11). Regardless of your truck's make, the inspection routine is identical: systematic, thorough, and documented.