Has anyone had a code SPN 111 FMI 3? Seems the sensor which plugs into radiator fill tank is leaking radiator fluid back through and into plug to ECU. Not sure if it is safe to drive uncorrected or not because it is engine protection circuit. In Texarkana, AR on way to Camp Entegra and beyond. Stuck here since 9:30 this morning.. SPN-111 FMI-18. Coolant Level - Data Valid But Below Normal Operating Range - Moderately Severe Level. Reason. Coolant Level - Data Valid But Below Normal Operational Range - Moderately Severe Level. Low engine coolant level detected. Effect. Possible reduced engine performance.
SPN: 111 FMI: 1/1 Lamp: Red REASON: The engine coolant is severely low. EFFECT: Engine may be shut down. Circuit Description: The coolant level sensor is a switch and is used to measure the level of the engine coolant in the radiator top tank. The coolant level sensor is immersed in the coolant and returns a different signal voltage when.. One reads SPN 111/FMI 4 - GHG17 and the other reads SPN 111/FMI 4 - EPA07 - EPA10 - GHG14 so you may have to do a little more digging to find out which code applies to your problem. Some Final Words. Ever since technology got a hold of the engine or auto industry, everything became more complicated and confusing. Automakers have made DIY.