Direct answers on 393.50D citations: OOS rates, CSA points, repair urgency, and what to do next based on 13M+ inspection records.
Ranks #1,072 of 3,146 FMCSR codes by citation frequency • OOS rate of 0.0% is below the FMCSR-wide average of 33.3%.
No/Defective air reservoir drain valve
Direct answers grounded in TruckCodex inspection data
No. Across our 13 million inspection records, 393.50D has a 0.0% out-of-service rate—none of the 338 all-time citations resulted in an OOS order. This is far below the all-FMCSR average of 31.4%. However, steering defects are safety-critical, so you should repair them immediately to avoid escalation or cascade violations.
A single 393.50D citation carries an 8-point severity weight on your CSA record. The actual impact on your Unsafe Driving BASIC depends on the 30-day rolling window—if you stack multiple violations within 30 days, points accumulate faster. One citation alone is manageable; repeated steering defects signal a maintenance gap.
First: document the exact defect the inspector cited. Second: inspect steering play, responsiveness, and component wear immediately. Third: check for co-occurring issues—our data shows 393.50D frequently pairs with lamp failures (17 co-citations in the last 90 days), brake problems (12 co-citations for slack adjusters), and fuel leaks (15 co-citations). Schedule repairs before your next haul. Fourth: request a copy of the inspection report to verify the finding.
393.50D is moderate in enforcement volume—ranked #1049 of 3,036 FMCSR codes. But context matters: similar steering defects like 393.53B (worn components) also carry 0.0% OOS rates. Compare it to 396.3(a)(1), a general maintenance code with 45.3% OOS rate and 236,919 citations—far more serious. Steering defects are cited less often but demand swift repair to prevent accident liability.
Yes, you can file a DataQs (FMCSA Roadside Dispute Resolution) challenge if you believe the inspection finding was incorrect or the inspector's measurement was flawed. Equipment defects are objectifiable—if you have repair records or a pre-inspection photo proving the steering was functional, submit them. DataQs cases typically resolve in 30–45 days. Be specific: reference the steering component (column, linkage, wheel bearing) and any calibration issues with the inspector's equipment.
Our data from the last 180 days shows Texas leads by far with 110 citations, followed by New Mexico with 2 citations and Illinois with 1 citation. Texas accounts for the overwhelming majority of 393.50D enforcement. If you operate primarily in Texas, invest in preventive steering inspections and document them monthly.
Very urgent. While 393.50D doesn't trigger immediate OOS, steering failure is a crash risk and liability nightmare. In the last 90 days, we recorded 50 citations—a steady enforcement pace. October 2025 saw a spike to 35 citations in a single month. Delaying repair invites follow-up inspections and potential escalation to paired safety codes. Repair within 48–72 hours if the defect is confirmed.
Freightliners dominate our 393.50D citation history with 97 citations all-time, followed by Macks (58), Peterbilts (34), and Kenworths (34). If you drive a Freightliner or Mack, steer maintenance should be part of your pre-trip routine. Older units or high-mileage tractors in these makes are more vulnerable to component wear and play.
Where 393.50D is most commonly cited (last 180 days)
Other violations commonly found on the same inspection (last 90 days)
TruckCodex aggregates official public-sector datasets. See the Source registry for dataset-level coverage and the Freshness log for last-import timestamps.
Census, SAFER, SMS, Licensing & Insurance (L&I), roadside inspections, crashes, and authority history.
Vehicle recall campaigns, defect investigations, and consumer safety complaints (SCRS).
Cross-border carrier registry and Canadian recall campaigns where applicable.
TruckCodex is an independent aggregator; it is not affiliated with FMCSA, NHTSA, EIA, or Transport Canada. Always verify compliance-critical information directly with the originating agency.