will 391.51(a) put my truck out of service
No. Across all time in our inspection database, 391.51(a) has never resulted in an out-of-service order. The OOS rate for this violation is 0.0%. This is a non-OOS eligible citation, meaning an inspector documents the finding but does not remove your vehicle from service. However, the citation still carries compliance weight in your safety profile and counts toward your carrier's CSA metrics.