What 387.31F means in plain language
387.31F is an administrative or general compliance code that enforcement officers cite during roadside inspections. While the exact regulatory text covers specific documentation or operational requirements, the core issue is that something in your vehicle, operation, or presented paperwork didn't align with federal motor carrier standards at the moment of inspection.
This is not a safety-critical mechanical violation. It's the kind of citation that can often be resolved through clarification, correction of records, or a follow-up submission to your carrier's safety and compliance team. The fact that you received it doesn't automatically mean your vehicle is unsafe or that you'll be removed from service.
What our enforcement data actually shows
Across our database of 13 million+ roadside inspections, 387.31F has been cited only 21 times all-time. In the last 12 months, we've recorded 15 citations, and just 1 citation in the last 90 days. This code ranks #1921 out of 3,036 FMCSR codes by citation frequency—meaning it's relatively uncommon.
The out-of-service rate for 387.31F is 4.8% (1 out of 21 all-time citations). By contrast, the all-FMCSR average out-of-service rate is 31.4%. This tells you that when officers cite 387.31F, they almost never place the vehicle out of service immediately. Twenty of the 21 drivers cited for this code remained in-service and able to continue their trip.
Who gets cited most
Our inspection records show 387.31F citations concentrated in a small number of states over the last 180 days. The United States led with 6 citations and a 0.0% OOS rate. Texas followed with 4 citations, though one resulted in an out-of-service placement (25.0% OOS rate there). Ohio recorded 1 citation with no out-of-service action.
The variation in OOS rates between Texas (25.0%) and the broader US average (0.0%) is noteworthy—about 25 percentage points apart—suggesting that Texas enforcement may have applied stricter interpretation in that single instance, but the sample size is very small.
How severe is this compared to similar codes
387.31F sits in the General/Admin category alongside codes like 390.21TB2-DOT (74,663 citations, 0.0% OOS rate) and 390.21T(b) (61,097 citations, 0.0% OOS rate). These vehicle-marking and documentation codes see far higher citation volume but share the same characteristic: they rarely result in out-of-service orders. Even 390.21(b), which addresses USDOT number display and has been cited 13,244 times, maintains a 0.0% OOS rate, showing that administrative and marking violations are treated as correctable, not grounds for immediate removal.
How to avoid it
Because this code appears so infrequently in our data, the most reliable prevention step is ensuring all routine paperwork and vehicle documentation is current and accessible during inspection:
- Review your carrier's compliance checklist before each trip. Make sure any required permits, registrations, or documentation referenced in your carrier's safety program are in your cab or vehicle.
- Double-check vehicle markings and placards during pre-trip inspection, especially on Freightliner and Kenworth units, which are the most common makes cited in connection with this code in our data.
- Confirm your USDOT number and carrier identification are legible on the vehicle exterior. Administrative codes often relate to missing or obscured identification.
- Ask your dispatcher or safety manager whether there are any special documentation requirements for your load, route, or carrier that day. Clarify before you roll.
- Keep your logbook, bills of lading, and proof of insurance organized and within arm's reach during the stop so you can produce them quickly and completely if asked.
Since the code has co-occurred with exhaust-discharge violations and fuel-system issues in our recent data, also pay attention to your vehicle's condition: visible fuel leaks or improper exhaust routing can sometimes be documented alongside administrative citations. A thorough pre-trip walk-around catches both safety issues and visible compliance problems.