What Does SPN 5246 FMI 0 Mean, Cause, and Fix?
SPN 5246 FMI 0 usually points to a severe “too high” condition in an aftertreatment or exhaust temperature system. This guide explains what the code means, how to diagnose sensor, wiring, or exhaust issues, and the steps to fix it correctly. Follow a clear troubleshooting path to avoid guesswork, reduce downtime, and keep your equipment running reliably.












