Will 172.407(a) put my truck out of service?
No. Across our 13 million+ inspection records, 172.407(a) has never resulted in an out-of-service order—the OOS rate is 0.0%. All 9 citations in our database were issued as violations, not OOS orders.
This stands in stark contrast to the national average of 31.4% across all FMCSR codes. Even similar hazmat violations like 177.834A show OOS rates above 99%, so 172.407(a) is among the least severe findings inspectors issue in the hazardous materials category.