will 374.313(b) put my truck out of service
No. Across our 13 million inspection records, the 0.0% out-of-service rate for 374.313(b) means this violation has never resulted in an immediate roadside OOS placement. In contrast, the all-FMCSR average OOS rate is 31.4%, so this citation is significantly less likely to ground your vehicle than many other violations. You'll receive the citation, but your truck stays on the road.