Direct answers about 177.839 hazmat violations: OOS rates, enforcement data, and what happens after you're cited.
Ranks #2,259 of 3,146 FMCSR codes by citation frequency • OOS rate of 33.3% is in line with the FMCSR-wide average of 33.3%.
Direct answers grounded in TruckCodex inspection data
Yes, but not always. Across our inspection records, 177.839 citations result in an out-of-service order 33.3% of the time—slightly higher than the 31.4% all-FMCSR average. Of the 9 all-time citations in our database, 3 were placed out of service and 6 were not. Your outcome depends on the specific circumstances of the violation and the inspector's findings.
177.839 is less severe than several related hazmat codes. General loading/unloading hazmat violations (177.834A-HMC) carry a 99.2% OOS rate with 3,954 citations, while placarding violations (177.817(a)) reach 75.1%. Your code's 33.3% OOS rate puts it in the middle tier of hazmat enforcement. It's ranked #2230 out of 3,036 FMCSR codes by citation volume, meaning it's rarely cited.
First, review the specific violation on your citation. Document the exact nature of the hazmat issue cited. Check your pre-trip and post-trip inspection logs for that vehicle. If you were fatigued or ill at the time, note that—our data shows 177.839 was cited once in the last 90 days alongside a driver fatigue violation (392.2RG). Request the inspection report and photos from the FMCSA's Record Query System (RQS) to understand the inspector's findings before deciding whether to contest through DataQs.
Yes, you can submit a DataQs record review request if you believe the citation is inaccurate or the inspection violated FMCSA procedures. DataQs allows you to contest factual errors in how the violation was documented. The strength of your challenge depends on whether the violation involves an observable equipment condition versus your carrier's documented hazmat procedures. You have 90 days from the inspection to file.
Very rarely. Our 13 million+ inspection records show only 9 all-time citations for 177.839, with just 1 citation in the last 12 months and 1 in the last 90 days. The most recent citation occurred in February 2026 in Texas. This code accounts for minimal enforcement activity compared to high-volume hazmat violations like 177.834A-HMC, which has 3,954 citations.
Based on the last 180 days of data, Texas recorded 1 citation (100% OOS rate). With only 1 recent citation total in our database, enforcement is too sparse to identify a geographic pattern. Hazmat violations in general show higher frequency in states with major transport corridors and chemical distribution hubs, but 177.839 specifically remains an uncommon citation.
Our all-time data shows nine carriers with one 177.839 citation each: Evans Delivery Company Inc, AutoZone Texas LLC, Ryder Transportation Solutions LLC, US Xpress Inc, Sowega Chlorinator Co Inc, Highway Safety Protection Corp, CMD Properties, Action Mobile Truck Repair, and Keen Transport & Logistics Inc. The single citation across all carriers in the last 90 days suggests this violation is not a persistent compliance problem for any fleet.
The trend is stable but minimal. Our inspection records show 1 citation in the last 90 days and 1 in the last 12 months (February 2026), indicating no increase or decrease in enforcement. With fewer than 10 all-time citations, 177.839 remains one of the least-cited FMCSR hazmat codes. Carriers and drivers should focus compliance effort on higher-volume violations like 177.834A-HMC and 177.817(a).
Where 177.839 is most commonly cited (last 180 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.