Direct answers on 393.1(c) enforcement, OOS rates, and next steps based on 13M+ inspection records. What drivers need to know right now.
Ranks #2,375 of 3,146 FMCSR codes by citation frequency • OOS rate of 0.0% is below the FMCSR-wide average of 33.3%.
Direct answers grounded in TruckCodex inspection data
No. Across our inspection records, 393.1(c) has a 0.0% out-of-service rate—none of the 6 citations on record resulted in an OOS placement. This code is not OOS-eligible under FMCSR enforcement. Compare that to the national average OOS rate of 31.4% across all FMCSR codes, and you can see 393.1(c) carries minimal immediate roadside impact. However, do not ignore it—get it resolved quickly to avoid accumulation on your record.
Low relative severity. Our database shows 393.1(c) ranks #2357 out of 3,036 FMCSR codes by citation volume, with only 6 all-time citations. For comparison, peer codes in vehicle maintenance range widely: 393.9(a) has 660,737 citations with a 15.4% OOS rate, while 396.3(a)(1) has 236,919 citations and a 45.3% OOS rate. The rarity of 393.1(c) citations suggests it is either very specific, infrequently checked, or reflects a narrow compliance gap. That said, rare violations can still hurt your CSA record if you accumulate multiple citations in the same family.
Yes, you can submit a DataQs challenge, but success depends on the type of finding. If the citation is based on a documentation error (for example, the inspector misread a maintenance record or cited the wrong vehicle), you have a strong case—submit the correct documentation through the DataQs portal with your PRISM account. If the citation reflects an actual equipment or maintenance defect found at roadside, contestability is lower unless you can prove the vehicle was already scheduled for repair or the defect did not meet the severity threshold in the regulation. Either way, gather all evidence before submitting.
Our inspection records show only 6 total 393.1(c) citations across all states in our 13 million-record database, with no citations in the last 90 days and none in the last 12 months. This extreme rarity means the data does not break down by state in a meaningful way. The last citation on record was more than one year ago. If you received a 393.1(c) citation recently, you are part of a very small population—which underscores the importance of immediate compliance and documentation.
Address it now, not later. While 393.1(c) has a 0.0% out-of-service rate and does not result in immediate roadside removal, the zero citations in the last 90 days and zero in the last 12 months suggest that when this code is cited, it signals a significant compliance gap. Delaying repair leaves you exposed to a second citation, which would compound your CSA record and could trigger carrier or insurance scrutiny. The faster you document and remedy the violation, the stronger your position if the citation is later reviewed.
Our records show six carriers with one 393.1(c) citation each: Waste Management of Maryland Inc (USDOT 334445), Advanced Irrigation Incorporated (USDOT 2086954), Pritam Transport Ltd (USDOT 2114890), Triple A Express Corp (USDOT 3043967), McCann Trucking LLC (USDOT 3118229), and Wyns LLC (USDOT 3945822). The fact that no single carrier has more than one citation reinforces the rarity of this code. This is not a carrier-specific pattern—it is an isolated, scattered enforcement issue.
393.1(c) is far less cited than related vehicle maintenance codes. 393.9(a) (inoperable lamps) has 660,737 citations with a 15.4% OOS rate. 396.3(a)(1) (inspection, repair, maintenance general) has 236,919 citations with a 45.3% OOS rate. 393.47E (slack adjuster defective) has 180,363 citations with 0.0% OOS rate. In contrast, 393.1(c) has only 6 citations with 0.0% OOS. This suggests 393.1(c) addresses a narrow, specific requirement that is either rarely violated or rarely inspected at scale. When it is cited, it reflects a very localized or unusual defect.
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.