What is SPN 111 FMI 3 Code? How to Solve It?
SPN 111 FMI 3 is a common fault code in off-road equipment that indicates an abnormally high voltage in the coolant level sensor circuit. While the machine may continue running, this issue can trigger false warnings and conceal real cooling system problems. This guide explains what SPN 111 FMI 3 means, why it occurs, and how to diagnose and fix the fault through proper circuit testing, sensor inspection, and reliable replacement solutions—helping prevent overheating and unplanned downtime.












