will 172.302(a) put my truck out of service
Yes—but not always. Across our 13 million+ inspection records, 172.302(a) citations result in an out-of-service order 55.9% of the time. That's notably higher than the all-FMCSR average of 31.4%. Of the 111 all-time citations in our database, 62 resulted in an OOS placement and 49 did not. The difference often hinges on whether the violation is documented as corrected on-scene or requires vehicle removal from service.