What 171.2(g) means in plain language
FMCSR 171.2(g) addresses cargo tanks—the specialized containers used to transport hazardous materials—that fail to meet Department of Transportation packaging and design standards. A cargo tank is a permanent or semi-permanent tank affixed to a motor vehicle and used to transport bulk liquids, gases, or hazardous goods. When an inspector cites you for 171.2(g), they've identified that your tank itself does not meet the applicable Hazardous Materials Regulations.
This is different from how you're operating the tank or what you're carrying in it. Instead, the violation points to the physical condition, construction, or certification status of the tank itself. Common reasons for this citation include missing or invalid DOT certification markings, structural damage that compromises the tank's integrity, failed pressure tests, corrosion affecting the container, or non-compliant fittings and closures. The citation focuses on whether the vessel can legally be used to haul hazardous materials at all.
What our enforcement data actually shows
Across our 13 million inspection records, 171.2(g) ranks #1727 of 3,036 FMCSR codes by citation volume. Over the agency's entire dataset, inspectors have issued 36 all-time citations for this violation. In the last 12 months, our records show zero citations, and zero citations in the last 90 days.
When this code is cited, it is rarely placed out of service. Our data indicates 1 vehicle was placed out of service for a 171.2(g) violation (2.8% OOS rate), while 35 were not. This is significantly lower than the all-FMCSR average out-of-service rate of 31.4%, suggesting that inspectors typically document the deficiency without removing the vehicle from operation at the roadside—though that does not diminish the seriousness of the underlying compliance issue.
Who gets cited most
Our inspection records do not break down 171.2(g) citations by state with sufficient granularity to identify a top-three list. However, our data shows that certain carriers have accumulated multiple citations for this violation. Fleets such as TOKKO CARRIERS DE MEXICO SA DE CV (USDOT 833065) and CALIFORNIA GAS TRANSPORT INC (USDOT 589266) each received 5 citations for cargo tank packaging non-compliance. SUTECO TRANSPORT LLC (USDOT 280084) accumulated 4 citations. These numbers reflect the cumulative enforcement record and do not imply a pattern of willful violations—cargo tank defects can arise from age, maintenance gaps, or certification lapses.
How severe is this compared to similar codes
In the Hazardous Materials Compliance category, 171.2(g) sits in the lower-volume range. Compare it to peer codes: 171.2(a) (Failure to comply with Hazardous Materials regulations) has been cited 87 times with a 3.4% OOS rate, and 171.2(f) (Transporting Hazardous Materials not in accordance with this part) has 42 citations and a 0.0% OOS rate. The code 171.2K-HMGRMC (Representing vehicle with Hazardous Materials with none present) is much more common at 255 citations with a 1.6% OOS rate.
The rarity of 171.2(g) enforcement suggests that cargo tank packaging compliance issues are not a widespread roadside finding—or when they are found, they may be cited under a broader code. The low OOS rate also indicates that inspectors view tank defects as documentable but not necessarily emergency removals, though regulatory remediation is still required.
How to avoid it
Pre-trip inspection and certification:
- Verify that your cargo tank has a valid DOT specification marking (usually stamped or permanently affixed to the tank). Do not operate a tank without visible, legible DOT certification.
- Check that the certification date has not expired. Tanks require periodic requalification based on their age and material.
- Inspect the tank exterior for corrosion, pitting, or structural cracks that could indicate loss of integrity. Any visible damage to the shell or seams is a red flag.
Fittings, closures, and vents:
- Confirm that all tank openings, lids, caps, and closure mechanisms are DOT-approved for your commodity. Non-compliant fittings are a common source of citations.
- Verify that pressure relief devices, gauges, and venting systems are in place and functioning. Missing or damaged safety equipment fails the packaging standard.
- Look for leaks, weeping, or corrosion around fittings and seams. A tank with active leaks or accumulated deposits will not pass inspection.
Maintenance and records:
- Keep copies of the tank's certification papers and any recent inspection or maintenance records in your vehicle. Inspectors will ask for proof of DOT compliance.
- If your tank requires hydrostatic testing or other periodic maintenance, ensure those services are performed on schedule and documented.
- If you own or operate multiple vehicles, do not assume all tanks are identical. Each tank has its own spec sheet and requirements based on construction date and material.
Commodity-specific requirements:
- Confirm that the tank you are using is authorized for the specific hazardous material you intend to transport. Some tanks are restricted to certain commodities or pressure ranges.
- Never transfer a tank between commodities without verifying that it meets the new commodity's packaging standards.