will 392.6 put my truck out of service
No. Across our 13 million inspection records, code 392.6 has never resulted in an out-of-service order. The OOS rate for this violation is 0.0%—all 4 all-time citations resulted in roadside warnings or citations without vehicle placement. Compare that to the national FMCSR average OOS rate of 31.4%, and you'll see this code is treated as a documentation issue rather than an immediate safety risk that grounds equipment.