will 374.313(a) put my truck out of service
No. Our inspection records show that 374.313(a) has never resulted in an out-of-service order. Across all-time enforcement data in our database, both citations resulted in the truck remaining in-service. The 0.0% out-of-service rate for this code is significantly lower than the 31.4% average across all FMCSR violations, meaning inspectors treat this violation as correctable without removing your vehicle from the road.