FMCSR 172.332A: Missing Hazmat Class ID on Placards

Yes, there's a significant risk. Across our inspection records, 172.332A resulted in an out-of-service placement 60.0% of the time—nearly double the all-FMCSR average of 31.4%. Of the 110 all-time citations in our database, 66 led to OOS and 44 did not. That means roughly 6 in 10 drivers cited for missing hazmat class or division ID numbers on placards had their trucks immediately pulled from service. Check your placards now for the required identification number.

This violation carries a CSA severity weight of 4. The severity weight is then multiplied by the number of violations within a 30-day rolling window—so one citation is 4 points, two within 30 days is 8 points, and so on. Because this is a hazmat-specific defect, it can accumulate quickly if multiple placards are found non-compliant on the same vehicle. Request your roadside inspection report to confirm the exact violation count cited.

First, if your truck was placed out of service, do not operate it until the citation is resolved. Our data shows that 172.332A often co-occurs with related placarding violations—172.504A (table 1 materials) appeared in 4 shared inspections in the last 90 days, and 177.817A (placarding violation) in 3. Inspect all hazmat placards for correct class/division identification numbers. If you're cited, contact your carrier or safety manager immediately to verify compliance before returning to service. Request the full inspection report to identify all co-cited violations.

Relatively speaking, yes—but less severe than some. Across hazmat codes in our database, general loading/unloading violations (177.834A-HMC) hit 99.2% OOS rate and 177.834(a) hit 97.9%. Placarding violations (177.817(a)) reach 75.1% OOS. At 60.0%, your 172.332A rate is serious but lower than those. However, it's well above the all-FMCSR average of 31.4%, placing it in the upper-risk category. The missing identification number creates a safety and compliance gap that inspectors treat as a primary defect.

Yes, you can file a Roadside Inspection Dispute (RID) through the FMCSA DataQs system within 90 days of the citation. Whether you'll succeed depends on the finding type. If the inspector documented the placard correctly and the identification number was genuinely missing, the citation will likely stand. If there's a documentation error—the number was present but the inspector missed it, or they cited the wrong placard location—you have grounds to dispute. Gather photos of your placards showing the class/division ID, your shipping papers, and the inspection report. File through DataQs with clear evidence.

Texas leads by a wide margin. In the last 180 days, our records show 28 citations in Texas, with 19 resulting in out-of-service placements (67.9% OOS rate—above the national 60.0%). Texas accounts for the majority of 172.332A enforcement in our dataset. If you operate hazmat in Texas, ensure your placards are audit-ready before crossing state lines. Carry documentation of placard compliance and training for your team.

Very urgent, especially if your truck was placed OOS. In the last 12 months, we recorded 61 citations for this violation, with a spike in May 2025 (9 citations) and February 2026 (8 citations). The trend shows steady enforcement. Because 172.332A is a hazmat-specific defect tied to public safety labeling, inspectors treat it as a critical issue. Even if you were not immediately OOS'd, fix it before your next roadside stop. Replace or correct any placard missing the required class or division identification number, and have a supervisor verify the fix against your hazmat shipping documentation.

Both. Like all roadside inspection violations, 172.332A data is recorded against both the driver's record (unsafe driving BASIC) and the motor carrier's record (hazmat compliance BASIC). This means a citation impacts your personal CSA profile and your company's FMCSA safety rating. If you're a fleet driver, your carrier's hazmat BASIC may suffer if multiple drivers or vehicles receive these citations. Corporate clients use tools like ours to catch patterns—3 citations from Greenwood Motor Lines, and 2 or more each from Fortune Carriers, True Chemical Solutions, and others in our all-time data.