What 177.839-HMHC means in plain language
FMCSR 177.839-HMHC addresses improper transportation of Class 8 materials—corrosive substances that can cause severe damage to skin, eyes, and equipment. These are among the most hazardous materials allowed on U.S. highways, and regulators are extremely strict about how they must be handled, loaded, secured, and transported.
When you receive a citation for this code, it means an inspector found that your vehicle, load, or transport practices did not comply with federal rules governing Class 8 materials. This could involve improper packaging, inadequate segregation from incompatible materials, insecure loading, or failure to follow required procedures during transport.
Unlike many hazmat violations, a 177.839-HMHC citation does not automatically trigger an out-of-service order. However, the violation still goes on your record and affects your company's safety profile in DOT databases that shippers, brokers, and insurers monitor.
What our enforcement data actually shows
Across our 13 million+ inspection records, we have documented 8 all-time citations for 177.839-HMHC, with 4 citations in the last 12 months and 3 in the last 90 days. The code ranks #2269 out of 3,036 FMCSR codes by citation volume—making it relatively uncommon in roadside enforcement overall.
None of the 8 all-time citations resulted in an out-of-service order, giving this code a 0.0% out-of-service rate. For context, the all-FMCSR average out-of-service rate is 31.4%, so 177.839-HMHC citations are significantly less likely to pull a vehicle off the road than the typical violation.
The enforcement trend shows a spike in February 2026, when 3 citations were issued; October 2025 saw 1 citation. This sporadic pattern is consistent with targeted hazmat audits rather than routine roadside checks.
Who gets cited most
Our inspection records show citations issued in four states over the last 180 days: Florida (1), Maine (1), New York (1), and Ohio (1). All four states recorded a 0.0% out-of-service rate, meaning no vehicles were placed out of service for this violation in those jurisdictions.
Among carriers in our database, Judge Family Enterprises Inc (USDOT 2474236) appears twice in the all-time record. Other carriers with single citations include FleetPride Inc, Herc Rentals Inc, AAA Cooper Transportation, PTG Logistics LLC, Olvin Romero's Home Improvement Inc, and Sunbelt Rentals Inc. This fragmentation across different fleet sizes and business types suggests the violation is not concentrated in any one carrier segment.
How severe is this compared to similar codes
Hazmat loading and unloading violations dominate the enforcement landscape. Code 177.834A-HMC (General loading/unloading hazmat) has logged 3,954 citations with a 99.2% out-of-service rate—nearly 500 times the citation volume of 177.839-HMHC and vastly more likely to result in vehicle impoundment.
Code 177.817(a) (Placarding violation) shows 2,274 citations with a 75.1% OOS rate, reflecting inspector concern that improper placards create public safety risk. Even 177.817(e) (Placard deteriorated/damaged), a less severe variant, has 2,038 citations with a 5.2% OOS rate.
By comparison, 177.839-HMHC at 0.0% OOS rate sits at the lower end of hazmat enforcement severity. This suggests inspectors may be citing it for documentation or procedural gaps rather than imminent hazard to public safety.
How to avoid it
Our inspection data reveals several violations that commonly appear alongside 177.839-HMHC citations:
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Verify your medical certificate is current and on file. Code 391.41APC appeared in 1 co-occurring inspection. Before every run carrying Class 8 materials, confirm your medical card is valid and registered with your state DMV.
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Conduct a thorough pre-trip vehicle inspection, especially lighting and wheel fasteners. Codes 393.11A1-LCL and 393.205C-WR (wheel fasteners) appeared in recent co-inspections. Hazmat transport requires vehicles in top mechanical condition. Check all lights, reflectors, and wheel fasteners for tightness and integrity.
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Double-check hazmat loading and unloading procedures before you touch the cargo. Code 177.834A-HMC co-occurred in 2 of the last 90 days' inspections. Review your company's loading checklist, confirm segregation rules (Class 8 materials cannot be loaded with certain other materials), and ensure the load is stable and properly secured.
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Never operate while fatigued or under the influence. Codes 392.2-SLLEQP, 392.2-SLLIFTA, and 392.2-SLLIRP (operating while ill or fatigued) each appeared in recent co-inspections. Hazmat transport demands 100% alertness. If you are tired, medicated, or unwell, notify your dispatcher and do not drive.
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Stay current on your hazmat certification if required for your role. Ensure you understand the specific packing, labeling, and transport rules for Class 8 materials your fleet handles. Take refresher training annually even if your certification does not require it.
The fact that 177.839-HMHC rarely results in out-of-service orders does not mean it is harmless. Each violation is recorded in the Federal Motor Carrier Safety Administration's SafetyFacts database, which affects your company's safety rating, insurance premiums, and eligibility for certain freight lanes. Prevention is always cheaper than remediation.