What 393.207B means in plain language
FMSCR 393.207B addresses the structural integrity of your truck's frame. The regulation requires that your commercial motor vehicle's frame be free of cracks, breaks, loose sections, or sagging. A frame is the backbone of your truck—it carries the engine, cab, cargo box, and everything else. When a frame cracks, breaks, or sags, the entire vehicle geometry changes. Axle alignment suffers. The cab and cargo area shift. Stress concentrates at weak points, risking catastrophic failure on the road.
Inspectors look for visible cracks in the frame rails, broken welds, loose frame bolts, or sagging areas where the frame has bent downward and no longer sits at design height. This is not a minor cosmetic issue. A compromised frame threatens your safety, your cargo, and everyone around you.
What our enforcement data actually shows
Across our 13 million inspection records, 393.207B ranks #527 out of 3,036 FMCSR codes by citation volume. Over the last 12 months, we recorded 1,263 citations for this violation. In just the last 90 days, inspectors cited it 301 times.
What stands out is the out-of-service rate. Our data shows a 51.1% out-of-service rate for 393.207B—meaning roughly half of all trucks cited for frame issues were immediately removed from service. That is 19.7 percentage points higher than the all-FMCSR average out-of-service rate of 31.4%. This code sits in a tier of violations serious enough that inspectors often cannot let you continue driving.
Of the 2,048 all-time citations in our database, 1,046 resulted in out-of-service orders and 1,002 did not. The monthly trend over the past year shows citations clustering between 84 and 140 per month, with January 2026 hitting the high mark at 140 citations and 78 out-of-service placements.
Who gets cited most
Our records show the heaviest concentration of 393.207B citations in three states over the last 180 days:
Texas leads with 483 citations and a 43.5% out-of-service rate. New Mexico follows with 79 citations and a notably higher 60.8% out-of-service rate—vehicles cited in New Mexico are more than twice as likely to be placed out of service. Iowa recorded 43 citations with a 72.1% out-of-service rate, the highest among top states, meaning nearly three-quarters of Iowa citations resulted in removal from service.
Among carriers in our all-time data, fleets such as New Prime Inc (USDOT 3706) appear with 27 citations for this code, and Servicio Internacional de Enlace Terrestre SA de CV (USDOT 818175) with 16 citations. These numbers reflect the scale of their operations and inspection exposure, not necessarily a pattern of systemic frame problems.
How severe is this compared to similar codes
393.207B sits within the Vehicle Maintenance category. To put its severity in context, consider three comparable codes:
393.9 (Inoperable Required Lamp) has generated 660,737 citations all-time—over 300 times more volume than 393.207B—but carries only a 15.4% out-of-service rate. Broken lights are frequent; frame problems are rarer and far more serious.
396.3(a)(1) (Inspection/Repair/Maintenance—General) shows 236,919 citations with a 45.3% out-of-service rate. It is cited three times more often than 393.207B but at a slightly lower out-of-service threshold.
393.78 (Windshield Condition Defective) has 157,894 all-time citations but only a 0.3% out-of-service rate. Windshield defects are cosmetic by comparison; frame cracks are structural and life-threatening. The 50.8 percentage-point difference in out-of-service rates tells you how much more seriously regulators treat frame integrity.
How to avoid it
Frame damage does not appear overnight. It results from impact, age, metal fatigue, overloading, or neglect. Here are concrete, driver-actionable steps:
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Walk the frame during every pre-trip inspection. Start at the front bumper and trace both frame rails backward to the rear axle. Look for visible cracks, welds that have split, or areas where the frame dips lower than normal. Run your hand along the frame rails—a sharp edge or separation means trouble.
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Check frame bolts and fasteners. Frame sections are bolted together. Use a wrench or socket to ensure they are tight. Loose bolts allow movement and accelerate cracking. Listen for rattles under load—they often signal loose fasteners.
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Do not overload your truck. Excess weight puts tremendous stress on the frame. Verify that your cargo and axle weight are within legal limits. Overloading is one of the fastest ways to crack a frame.
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Avoid potholes and railroad crossings at speed. Sudden vertical impacts transmit shock through the frame. Slow down and cross railroad tracks and rough pavement at controlled speeds.
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Have frame damage inspected immediately after a collision or impact. Do not wait. A hidden crack grows with every mile. Get a certified mechanic to pressure-wash and inspect the frame, paying special attention to welds and areas near impact zones.
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Address related maintenance issues promptly. Our data shows that 393.207B commonly co-occurs with inoperable lamps (105 shared inspections in 90 days), defective couplings (43), windshield defects (41), and lighting issues (39). These minor failures often come alongside frame deterioration. Systematic pre-trip discipline catches all of them.
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Know your vehicle. Freightliner (FRHT) vehicles appear in our data with 814 citations for frame issues all-time, followed by utility trailers (UTIL) with 525. If you operate this equipment, invest extra vigilance in frame checks. Frame problems manifest differently across makes and model years.