What 393.207D-S means in plain language
A broken coil spring is a structural failure in your truck's suspension system. Coil springs support your vehicle's weight and absorb shock from the road surface. When one breaks, your truck loses load-bearing capacity and handling stability, which directly affects braking performance, steering control, and overall road safety.
This violation is written up when an inspector finds evidence of a cracked, separated, or completely fractured coil spring during a roadside inspection. A broken spring isn't a wear item you can ignore until the next scheduled maintenance—it's a mechanical failure that degrades your vehicle's ability to operate safely under load.
What our enforcement data actually shows
Across our 13 million inspection records, 393.207D-S citations are uncommon but serious. We've documented 25 all-time citations nationally, with 9 issued in the last 12 months and 1 in the last 90 days. This ranks the code #1860 out of 3,036 FMCSR codes by citation volume.
What matters most: the out-of-service rate. Of the 25 citations in our database, 23 resulted in the vehicle being placed out of service—a 92.0% OOS rate. That's nearly three times higher than the all-FMCSR average OOS rate of 31.4%. When an inspector cites you for a broken coil spring, they're almost certain to take your truck off the road immediately. This isn't a citation you can argue your way past at the scale.
The monthly trend over the past year shows sporadic enforcement: 2 citations in June 2025, 1 in July, 1 in August, 2 in October, 2 in November, and 1 in February 2026. The citation volume is low enough that seasonal or regional patterns are hard to establish from the data alone.
Who gets cited most
Our data from the last 180 days shows Georgia leading with 2 citations, both resulting in out-of-service placements (100.0% OOS rate). California, New York, and Utah each had 1 citation in this period, all resulting in OOS. The consistency across these states—100% OOS rates in every case—reinforces that this violation is treated uniformly as a safety-critical defect regardless of jurisdiction.
At the carrier level, our all-time records show Waconia Transport Company Inc (USDOT 234391) with 3 citations for this violation—the highest count in our database. This does not indicate systemic negligence; rather, it reflects that even well-established carriers encounter broken coils occasionally. The remaining top carriers in our data each have 1 citation, spread across U-Haul, Oak Hill Farm, The Home Lumber & Supply Company, Oseguera Trucking, and others.
How severe is this compared to similar codes
Breaking down the vehicle maintenance category, 393.207D-S sits at the extreme end of the severity spectrum when measured by out-of-service rates. Compare these peer codes:
- 393.9(a) (Inoperable required lamps): 660,737 citations with a 15.4% OOS rate
- 396.3(a)(1) (Inspection/repair/maintenance general): 236,919 citations with a 45.3% OOS rate
- 393.78 (Windshield condition defective): 157,894 citations with a 0.3% OOS rate
While broken coil springs generate far fewer citations than lamp failures or general maintenance violations, the 92.0% OOS rate means they carry exceptional enforcement weight. Inspectors treat a broken coil spring as an immediate, non-negotiable mechanical failure. This contrasts sharply with codes like 396.17C (No proof of periodic inspection), which carries 212,081 citations but a 0.0% OOS rate—a purely administrative violation.
How to avoid it
A broken coil spring usually doesn't happen overnight. Prevention centers on regular suspension inspection and recognizing early warning signs before a spring fractures.
Before every trip:
- Walk around your truck and visually inspect the coil springs on both the front axle (if equipped) and rear axle. Look for any visible cracks, separation, or sagging on one side relative to the other. A sagging side is a red flag that a spring has lost tension or is cracked.
- Push down on each corner of the cab and box. The suspension should compress smoothly and return to the same height on both sides. Uneven height or a clunking sound suggests a broken spring.
- Listen for clunking or rattling from under the frame when you shift into gear or hit a bump. A broken spring often rattles against the frame or other suspension components.
Maintenance habits:
- Our co-occurrence data shows that broken coil springs often appear alongside other suspension defects like broken main leaf springs (393.207C-SBML), suspension defects (393.207A variants), and steering issues (393.209E-SPSLA). If you've had one suspension component fail, increase inspection frequency on the entire suspension system.
- Vehicle makes with the highest citation counts in our data for this violation are Ford (5 citations), Freightliner (4 citations), and Kenworth (4 citations). If you drive one of these makes, factor in the suspension lifespan: coil springs typically last 80,000–120,000 miles under normal service. Check your maintenance schedule and don't defer spring replacement when a technician recommends it.
- Avoid overloading. Coil springs are engineered for a specific load rating. Exceeding GVWR or unevenly distributing cargo accelerates spring fatigue and fracture risk.
- Report any suspension noise or handling change to your fleet maintenance team immediately. A spring on the verge of breaking will signal its distress through vibration, noise, or a noticeable change in how the truck sits or steers.
The data is clear: a broken coil spring citation almost always ends in an out-of-service order. The best strategy is catching the problem before an inspector does.