What 393.65(f) means in plain language
FMCSR 393.65(f) prohibits operating a commercial motor vehicle when any tire is flat or audibly leaking air. This is straightforward: if you can hear air hissing from a tire or the tire has lost enough pressure that it's visibly flat, you cannot legally drive that vehicle until it's repaired or replaced.
The regulation doesn't require a blowout or catastrophic failure. An audible leak—one you or an inspector can hear—is enough. A flat tire, whether it happened overnight in the lot or during your shift, puts you in violation the moment you roll the truck.
This is a pre-trip inspection issue. Most citations occur because a driver missed the problem during their walk-around, or because a tire failed between inspections and the driver didn't notice immediately.
What our enforcement data actually shows
Across 13 million inspections in our database, FMCSR 393.65(f) has generated 1,015 all-time citations and ranks #713 out of 3,036 FMCSR codes by citation volume. In the last 90 days and last 12 months, our inspection records show zero citations—indicating this violation is now caught and corrected before roadside, or enforcement focus has shifted elsewhere.
The out-of-service (OOS) rate for this code is 0.5%: only 5 trucks out of 1,010 cited were placed out of service. This is dramatically lower than the all-FMCSR average OOS rate of 31.4%. The data indicates that inspectors typically issue a citation and allow the driver to repair the tire and continue, rather than yanking the vehicle off the road immediately. This reflects the straightforward nature of the fix: replace or patch the tire, verify it holds air, move on.
Who gets cited most
Our inspection records do not provide state-level breakdowns for this citation code, so we cannot name the top three states by count. However, carrier data shows concentration: QUALITY TANK SA DE CV (USDOT 2864600) has 18 citations, and OSCAR GUILLERMO JURAIDINI SILVA (USDOT 2511762) has 17 citations. These figures suggest that certain fleets or owner-operators have been cited repeatedly, possibly indicating a pattern of deferred maintenance or inadequate pre-trip discipline.
Vehicle make data reveals that Freightliner trucks account for 129 citations—the highest among all makes—followed by unclassified vehicles (OTHR) at 83 citations and Kenworth at 63 citations. This distribution likely reflects the market share of these makes rather than inherent design defects.
How severe is this compared to similar codes
Within the Vehicle Maintenance category, 393.65(f) sits far below the most frequently cited code. For context, FMCSR 393.9(a) (Inoperable required lamps) has accumulated 660,737 citations with a 15.4% OOS rate—nearly 650 times more citations. FMCSR 396.3(a)(1) (Inspection/repair/maintenance - general) shows 236,919 citations and a 45.3% OOS rate, meaning it triggers out-of-service enforcement far more often. Even FMCSR 393.78 (Windshield condition defective) has 157,894 citations versus this code's 1,015, though its OOS rate of 0.3% is similarly low.
The rarity and low OOS rate of 393.65(f) suggest enforcers treat it as correctable on-site. It is not a career-threatening violation.
How to avoid it
Before every shift:
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Walk around your truck and physically inspect every tire. Look for visible deflation and listen for hissing air. Do not skip tires on the trailer tandems or steer axle just because you're in a hurry. Freightliner and Kenworth trucks dominate the citation data, but this violation crosses all makes—it is a discipline problem, not a mechanical flaw.
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Check tire pressure with a gauge if you have doubts. A tire can be dangerously low without looking completely flat. Know your truck's cold-inflation specifications and verify at least once weekly.
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Address slow leaks immediately. If you notice a tire losing pressure over days, do not defer the repair to the next maintenance window. A slow leak becomes an audible leak, which becomes a citation.
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Inspect the condition of tire walls and treads while you are at it. Look for cracks, bulges, or embedded objects that could cause a sudden failure during your run.
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If a tire fails during your trip and you cannot repair it roadside, do not continue driving. Call dispatch and arrange a tow or replacement before moving the vehicle. Operating with a flat tire violates 393.65(f) and invites a citation.
At the carrier level (if you manage a fleet):
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Enforce pre-trip inspection routines and audit them. Citations for this code suggest drivers are not doing thorough walk-arounds or are cutting corners on reporting soft tires.
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Schedule tire rotations and pressure checks on a cadence, not on-demand. Preventive discipline prevents citations.
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Train drivers on what "audible leak" means so they catch problems before an inspector does.