will 172.203(a) put my truck out of service
No, most trucks cited for this violation remain in service. Across our inspection records, 172.203(a) resulted in an out-of-service order just 1.6% of the time—well below the national average OOS rate of 31.4% across all FMCSR codes. Of the 62 all-time citations in our database, only 1 truck was placed out of service. This is a documentation violation, not an equipment failure, so you'll likely be allowed to continue operations after the citation.