FMCSR 393.51(c) – Steering Wheel Free Play Excessive

Yes—there's a 73.7% chance your truck will be placed out of service for this violation. That's more than double the all-FMCSR average out-of-service rate of 31.4%. Across our inspection records, 836 trucks were removed from service for excessive steering wheel free play, compared to only 299 that remained in service. This means inspectors treat steering geometry as a critical safety issue and typically ground the vehicle on the spot until repairs are made.

This violation carries a CSA severity weight of 6 points. The points are applied to your Unsafe Driving BASIC within the 30-day rolling compliance window. CSA points accumulate per violation and per inspection period—if you've received multiple citations in the same month, each adds separately. One 393.51(c) citation is significantly less severe than major violations like brake failure, but the high out-of-service rate (73.7%) means you'll face immediate compliance costs and downtime.

1. Stop driving immediately—with a 73.7% out-of-service rate, your truck is likely already parked.
2. Locate a certified mechanic qualified in steering system service (power-assist or manual steering).
3. Request written inspection findings from the inspector—verify the specific free-play measurement and steering type cited.
4. Schedule repair before re-inspection—steering geometry is not drivable.
5. Document the repair receipt—keep proof of corrective work for CSA dispute or re-certification.
6. Request re-inspection once repairs are complete to clear the out-of-service status.

Yes. Our inspection records show 393.51(c) has a 73.7% out-of-service rate, which is dramatically higher than most other vehicle maintenance codes. For comparison, inoperable lamps (393.9) have a 6.9% OOS rate, and defective windshield conditions (393.78) have a 0.3% OOS rate. Only brake-related violations like slack adjuster defects approach this severity in practice. The high OOS rate reflects FMCSA's stance that steering play directly threatens driver control and crashes—not minor cosmetic wear.

Yes. DataQs (the FMCSA's online dispute system) accepts challenges for objective measurement errors. For steering wheel free play, your case is strongest if: (1) the inspector's measurement exceeded the applicable threshold in your steering system manual, (2) you can show repair/replacement receipts predating the citation, or (3) the inspection report contains calculation errors. Equipment citations are contestable if the facts are wrong; if the measurement is correct per manufacturer specs, DataQs will likely uphold the violation. File within 120 days of the inspection.

Rarely. Our roadside inspection database shows zero citations for 393.51(c) in the last 90 days and zero in the last 12 months. All-time, only 1,135 citations have been issued since FMCSA began tracking—ranking it #684 out of 3,036 FMCSR codes by citation volume. This low current enforcement volume suggests either improved steering maintenance across the industry, less frequent steering inspections by roadside officers, or both. However, when inspectors do cite it, the 73.7% out-of-service rate shows zero tolerance.

Across our 13 million+ inspection records, Kenworth leads with 255 citations, followed by Freightliner with 232, and Peterbilt with 193. These three makes account for roughly 46% of all 393.51(c) violations in the dataset. International (157 citations) and Volvo (76 citations) round out the top five. The concentration in Class 8 tractors reflects their high miles and the cumulative wear on steering linkages over 500k+ mile lifecycles. Older or higher-mileage units in these fleets are more likely to develop excessive free play.

Both. The violation appears on your CSA driver record and on your carrier's CSA carrier record. A single steering violation affects your Unsafe Driving BASIC (6 points) and your carrier's Vehicle Maintenance BASIC. If your carrier accumulates multiple maintenance violations across drivers and units, their BASIC score rises—potentially triggering audits or safety interventions. This means your steering citation can indirectly impact your company's insurance rates and safety profile, not just your own compliance history. Fleet managers should track citations across all drivers.