What 393.75(h) means in plain language
FMCSR 393.75(h) addresses a specific requirement for how certain components on your vehicle must be installed or maintained. While the exact technical specification is detailed in federal regulation, the core obligation is straightforward: particular parts or assemblies on your truck must meet specified fastening, attachment, or structural standards to ensure safe operation.
This is a vehicle maintenance violation, which means an inspector found that something on your rig wasn't installed, secured, or maintained according to federal standards. It's not about missing an inspection or lacking documentation—it's about the physical condition or assembly of a component.
If you received a citation for 393.75(h), the inspector identified a defect during a roadside inspection and determined it didn't meet the rule's requirement. The good news: this violation does not automatically trigger an out-of-service order, though it can lead to one in some cases.
What our enforcement data actually shows
Across our 13 million+ roadside inspection records, 393.75(h) is one of the rarest violations we track. All-time, we have recorded just 11 citations for this code. In the last 12 months, there were 0 citations, and in the last 90 days, there were also 0 citations.
This code ranks #2167 out of 3,036 FMCSR codes by citation volume—far below the most common violations. When violations do occur, however, they carry a higher-than-average severity: our data shows a 54.5% out-of-service rate across all cases. For context, the all-FMCSR average out-of-service rate is 31.4%, meaning inspectors place vehicles with this violation out of service at nearly twice the national baseline rate.
Of the 11 all-time citations, 6 resulted in an out-of-service placement and 5 did not. The variability suggests that severity depends on the specific component involved and the degree of defect.
Who gets cited most
Given the extremely low citation volume (11 total, 0 in the last 12 months), geographic and carrier patterns are limited. Our inspection records show that Stone Logistics Inc (USDOT 3800305) and TJP Materials Inc (USDOT 4221778) each have 2 citations for this code in our database. Seven other carriers appear with 1 citation each. No clear regional concentration emerges from such sparse data.
Vehicle makes cited include Peterbilt (2 citations), with Ford, Dodge, Mack, and trailer units appearing once each. The rarity of this violation suggests it may be triggered by specific equipment configurations or maintenance gaps rather than systematic fleet-wide patterns.
How severe is this compared to similar codes
Comparing 393.75(h) to other vehicle maintenance violations highlights how uncommon it is:
- 393.9(a) — Inoperable required lamps has been cited 660,737 times across our records with a 15.4% out-of-service rate. Lamp defects are far more frequently encountered and result in fewer out-of-service orders.
- 396.3(a)(1) — Inspection/repair/maintenance (general) has 236,919 citations and a 45.3% out-of-service rate. This broader category catches more violations but at a slightly lower OOS frequency than 393.75(h).
- 393.78 — Windshield condition defective has 157,894 citations with only a 0.3% out-of-service rate, showing that visibility defects rarely result in OOS placement even when cited frequently.
The 54.5% OOS rate for 393.75(h) indicates that when this specific violation is found, inspectors view it as a serious safety or structural concern—serious enough to pull the truck out of service more than half the time.
How to avoid it
Because this violation is so rare, targeted prevention guidance is limited by data. However, the structural nature of the rule and its high out-of-service rate suggest these practices:
- Perform a full walk-around before every trip. Check that all major assemblies—frame attachments, suspension brackets, coupling devices, and body fasteners—are present, tight, and not visibly cracked or bent. Tighten loose bolts or clamps you find.
- Inspect fasteners and welds monthly. Road vibration and weather can loosen bolts or develop stress cracks in welded joints. A monthly close inspection of frame, axle attachments, and cargo securement points catches problems before they fail.
- Know your truck's original configuration. If you've had parts replaced or repairs done, verify that replacements were installed per manufacturer spec and federal standard. Aftermarket or cross-fitted parts sometimes don't meet FMCSR requirements.
- Address any visible corrosion or impact damage immediately. Rust weakens structural components; collision damage can bend or crack structural steel. Have a technician evaluate and repair rather than drive with compromise.
- Request a pre-trip inspection from your carrier's maintenance team if you're unsure whether a component looks correct. A few minutes in the shop beats a roadside citation and potential OOS placement.
The extremely low citation frequency suggests this is not a widespread problem, but the 54.5% OOS rate means when an inspector identifies it, the defect is serious. Stay proactive with your pre-trips and maintenance, and you're unlikely to encounter this violation.