FMCSR 393.71H – Fifth Wheel Defective: What You Need to Know

Not automatically, but it's a 50/50 outcome. Across our inspection records, 393.71H has been placed out of service in 12 of 24 all-time cases—a 50.0% OOS rate. This is significantly higher than the all-FMCSR average of 31.4%, which means inspectors are removing trucks for fifth wheel defects more often than they do for most other violations. Whether you'll be sidelined depends on the severity of the defect the inspector documents.

This violation carries an 8-point CSA severity weight. Under FMCSA scoring, the actual points added to your safety profile depend on when the citation was issued and the 30-day lookback window—recent violations hit harder. A single 393.71H will not wreck your BASIC, but if you accumulate multiple maintenance violations, you'll move toward intervention thresholds faster. Check your SafetyNet portal to see your current score.

First, get the truck inspected by a qualified mechanic who understands fifth wheel assembly—kingpin, locking mechanism, and mounting bolts. Our data shows that when 393.71H appears alongside medical certificate issues and operating defects (like fatigue violations), the inspection often flags multiple systems at once. Before you drive again: (1) photograph the cited defect, (2) have it repaired and documented, (3) request a post-repair inspection from DOT if required in your state, (4) keep all receipts. Do not operate until the fifth wheel is certified secure.

Yes, it's more serious than most lighting and structural defects. Compare it to peer codes in Vehicle Maintenance: 393.9 (inoperable lamps) has a 6.9% OOS rate, 393.11 (lighting/reflectors) 1.8%, and 393.78 (windshield) 0.3%. The 393.71H 50.0% OOS rate puts it in a different category—closer to major brake and structural failures. Fifth wheels are safety-critical coupling points; when defective, they risk jackknife or trailer separation. Inspectors treat them accordingly.

Yes, you can file a DataQs request with FMCSA to challenge the citation if you believe it was wrongly recorded or if you have evidence the defect was corrected before the inspection was finalized. Fifth wheel defects are physical findings (not documentation or logbook errors), so your case is stronger if you have pre-repair photos, mechanic statements, or repair records showing the defect didn't exist as cited. DataQs challenges can take 30–60 days; file early if you plan to contest.

Over the last 180 days, our inspection data shows Texas leads with 5 citations and zero out-of-service placements (0.0% OOS rate), followed by Illinois with 1 citation and 1 out-of-service (100.0% OOS rate). The volume is low nationally—393.71H ranks #1870 of 3,036 FMCSR codes by citation count. This is not a frequently cited violation, which means when you do get one, it reflects a real issue that caught an inspector's attention.

Very urgent. Over the last 90 days, we've recorded 2 citations for 393.71H, and the 12-month trend shows citations concentrated in mid-2025 (July: 3, October: 4). While volume is low, the 50% OOS rate means you face a real likelihood of being removed from service if the defect is re-inspected. Fifth wheel failures can cause catastrophic accidents; do not delay repair. If you were placed OOS, you cannot operate until a certified inspector signs off on the repair.

This violation is tied to the vehicle, not the driver—it appears on your truck's inspection history and your carrier's safety record. If you're an owner-operator, the citation is on your USDOT profile. If you're a driver for a fleet, the violation counts against the carrier's Vehicle Maintenance BASIC in CSA scoring. Either way, it affects hiring and insurance for whoever operates that truck. The defect belongs to the equipment, not the person behind the wheel.