FMCSR 393.209(d) Loose/Missing Wheel Fasteners: Driver Q&A

Almost certainly yes. Across 10,483 all-time citations in our inspection records, 393.209(d) carries an 88.0% out-of-service rate — meaning 9,225 of those inspections ended with the vehicle placed OOS on the spot. That is nearly three times the all-FMCSR average OOS rate of 31.4%. If an inspector finds loose, missing, or defective wheel fasteners, do not expect to drive away. The truck stays put until the condition is corrected and the inspector clears it or a re-inspection is completed.

393.209(d) carries a severity weight of 8 — one of the higher values on the CSA scale, which runs from 1 to 10. That base score is then multiplied by a time-weight factor: violations from the most recent 6 months receive a 3× multiplier, violations from 6–12 months ago receive a 2× multiplier, and violations older than 12 months receive a 1× multiplier. Because this violation falls under the Vehicle Maintenance BASIC (Group BASIC 5), the points accumulate on the carrier's Maintenance BASIC percentile and can affect the driver's Safety Measurement System record as well.

Stop driving and get the wheel fasteners corrected before moving the vehicle. Here is the immediate checklist:

1. Do not move the truck — with an 88.0% OOS rate, assume you are OOS until cleared.
2. Contact your fleet or dispatcher — they need to arrange a roadside repair or tow to a shop.
3. Get a certified repair receipt — document exactly which fasteners were replaced or torqued, including axle position.
4. Retain all paperwork — repair invoices and torque specs are your evidence if you later challenge the citation through DataQs.
5. Check the rest of the wheel-end — an inspector who found loose fasteners will often look closely at related hardware on all axles.

Yes, it is among the most serious wheel-end violations by OOS rate. Our inspection records rank 393.209(d) at #226 out of 3,036 FMCSR codes by citation volume, but its 88.0% OOS rate dwarfs most peers in the Vehicle Maintenance category. For context, 393.9(a) — inoperable required lamps — has 660,737 citations but only a 15.4% OOS rate. Even 396.3(a)(1), the general inspection/repair/maintenance code, sits at a 45.3% OOS rate across 236,919 citations. A loose wheel fastener is treated by inspectors as an immediate threat to public safety, and the data backs that up.

Yes, you can submit a DataQs Request for Data Review (RDR), but the bar is high for an equipment-based finding. Unlike a documentation violation — where a missing form can be corrected with paperwork — a loose or missing wheel fastener is a physical condition the inspector observed and typically photographed. A successful challenge usually requires proof that the citation was recorded in error (wrong vehicle unit, wrong regulation code, or inspector clerical mistake). Repair records showing the fasteners were actually within spec at the time of inspection, or evidence that the inspection report identifies the wrong axle, are the strongest grounds. Submit your RDR through the FMCSA DataQs portal within two years of the inspection date.

Freightliner (FRHT) leads by a wide margin. Our inspection database shows FRHT vehicles account for 1,123 citations under 393.209(d) — more than any other make. Peterbilt (PTRB) comes in second at 675 citations, followed by Kenworth (KW) at 530 citations. Freightliner models logged as 'FREIGHTLIN' add another 430 citations, suggesting combined Freightliner-branded trucks represent a substantial share of all 10,483 recorded violations. This likely reflects fleet size and market share more than any specific design defect, but fleet managers running heavy Freightliner or Peterbilt equipment should make wheel-end torque checks a routine pre-trip priority.

No. The urgency is immediate. The 88.0% OOS rate tells you that inspectors treat this as a stop-right-now condition, not a fix-it ticket. Of 10,483 all-time citations in our records, 9,225 resulted in the vehicle being placed out of service on the roadside. A wheel that loses a fastener — or loses the entire assembly — at highway speed is a catastrophic failure risk. There is no 'drive to the next exit' option here. If your pre-trip or en-route check reveals loose or missing lug nuts, the repair must happen before the truck moves.

Both the driver and the carrier are affected, but in different ways. In FMCSA's Safety Measurement System, equipment violations like 393.209(d) are attributed to the carrier's Vehicle Maintenance BASIC, which affects the carrier's safety percentile and can trigger interventions. The citation also appears on the driver's inspection history and can influence their individual Safety Measurement record. Carriers with the most citations in our database — including Evans Delivery Company Inc (USDOT 38111) with 28 citations and VRP Transportes de Mexico (USDOT 662058) with 14 — illustrate how repeat findings accumulate against an operating authority over time.