What 393.207A-STCB means in plain language
This violation covers a commercial motor vehicle that has a suspension system in a failed or deteriorated condition. Inspectors are specifically looking for components that are broken, cracked, missing, or otherwise unable to perform their intended function — things like leaf springs, U-bolts, and other structural parts of the suspension assembly.
The suspension system is what keeps your axles connected to the frame and your load distributed across the road surface. When a key component gives out, the truck's ability to handle, brake, and stay stable under load is directly compromised. This isn't a paperwork issue — inspectors can see or feel a failed suspension component, and the consequences at roadside are severe.
What makes this citation particularly costly is that it doesn't require the component to be completely gone. A cracked or weakened leaf spring, a loose or absent U-bolt, or any suspension element that can no longer do its job is enough to trigger the write-up. Inspectors at weigh stations and roadside checkpoints are trained to spot these conditions during Level I and Level II inspections.
What our enforcement data actually shows
The numbers here are stark. Across our inspection records, 393.207A-STCB carries a 95.4% out-of-service rate — meaning that when an inspector cites this code, the truck gets parked almost every single time. To put that in context, the all-FMCSR average OOS rate across all codes is 31.4%. This code runs more than three times that average.
This code is ranked #330 out of 3,036 FMCSR codes by total citation volume, with 5,266 all-time citations in our database. Of those, 5,025 resulted in an out-of-service order. Only 241 inspections where this code was written did not result in the driver being placed out of service.
Enforcement is not slowing down. Our inspection records show 3,111 citations issued in the last 12 months alone, and 487 citations in just the last 90 days. Monthly volumes peaked at 349 citations in May 2025 and have remained elevated, with 214 citations recorded in March 2026. If you are reading this after being cited, you are far from alone — but that also means inspectors are actively looking for this condition.
Who gets cited most
Looking at the last 180 days of our inspection data, federal inspections under the US jurisdiction account for 315 citations, every single one of which resulted in an out-of-service order — a 100.0% OOS rate. California follows with 240 citations, though its OOS rate is 75.0%, noticeably lower than the national pattern. Missouri rounds out the top three with 73 citations, all resulting in OOS orders at a 100.0% rate.
The gap between California's 75.0% OOS rate and the 100.0% rates seen in Missouri, Washington, South Carolina, Virginia, Utah, Georgia, Arizona, and Maryland is worth noting for fleet managers. California's inspectors appear to document the condition without always placing the unit out of service at the same rate, but a 75.0% OOS rate is still far above average for any maintenance code.
Our data shows fleets such as JESUS PEDRO PEREZ CARRILLO (USDOT 1159851) with 72 all-time citations and GUILLERMO ESQUER GARCIA (USDOT 3036898) with 27 citations appearing at the top of the citation counts in our database. These numbers reflect how quickly citations accumulate when suspension maintenance is not part of a consistent inspection routine.
How severe is this compared to similar codes
Within the Vehicle Maintenance category, 393.207A-STCB stands out sharply when compared to peer codes in terms of OOS impact. Consider 393.9(a) — Inoperable required lamps, which has 660,737 citations in our database but carries only a 15.4% OOS rate. That code is cited far more often, but the chances of getting parked are nowhere near what you face with a defective suspension finding.
Look at 396.17C-PI — No proof of periodic inspection, which has 212,081 citations and a 0.0% OOS rate. That is a paperwork violation; inspectors write it up, but it does not ground the truck. A defective suspension is the opposite: our data shows it grounds the truck 95.4% of the time.
Even 396.3(a)(1) — Inspection/repair/maintenance (general), with 236,919 citations and a 45.3% OOS rate, does not come close to the out-of-service likelihood that 393.207A-STCB produces. When an inspector finds a broken or missing suspension component, the enforcement outcome is nearly automatic.
How to avoid it
The co-occurring violation pattern in our inspection records tells you exactly where to focus your pre-trip. In the last 90 days, 393.207A-STCB appeared alongside slack adjuster defects (393.47E) in 73 shared inspections, brake out-of-service conditions (396.3A1-BOS) in 64 shared inspections, and brake tubing and hose problems (393.45B2-B-AIR) in 39 shared inspections. A deteriorated suspension and a deteriorated brake system tend to show up together — if one is failing, the other often is too.
Freightliner units account for 1,333 all-time citations under this code in our database, followed by Kenworth at 511 and International at 448. If you operate one of these makes, your pre-trip suspension check deserves deliberate attention, not a walk-by glance.
Here is what to do before every dispatch:
- Walk each axle and visually inspect every leaf spring pack. Look for cracks that run across the width of a leaf, broken or separated leaves, and springs that appear bowed or shifted out of alignment.
- Check every U-bolt on every axle. A U-bolt that is loose, bent, cracked at the threads, or missing a nut is a direct path to this citation and an OOS order.
- Look for fuel system and coupling device conditions while you are under the trailer. Our data shows 396.5B-L (fuel system leak) co-occurring in 57 shared inspections and 393.55E-B (coupling device defective) in 43 — these are under-vehicle items you can check at the same time as suspension components.
- Check your tires for severe underinflation. Tires running at less than 50% of maximum inflation pressure appeared in 70 shared inspections alongside this code. Severe underinflation puts abnormal stress on suspension components and can mask or accelerate their failure.
- Document what you find. If you identify a suspension component that is cracked or questionable, flag it before dispatch. A shop repair documented before a roadside stop is always better than a 95.4%-odds OOS order on the road.