SPN 3719 is a diagnostic code that indicates a problem with the diesel particulate filter (DPF) system in a Freightliner truck. The DPF is a device that traps and burns the soot particles from the exhaust gas, reducing the emissions and improving the fuel efficiency of the engine. However, the DPF needs to be periodically… Read More »
SPN 597 FMI 2 is a fault code that indicates a problem with the service brake switch signal on a Freightliner truck. The service brake switch is a device that sends a signal to the engine control module (ECM) when the driver applies or releases the service brake pedal. The ECM uses this signal to… Read More »
If you own or operate a Detroit Diesel engine, you may encounter a fault code that reads SPN 164 FMI 20. This code indicates a problem with the fuel rail pressure sensor or the quantity control valve. In this article, we will explain what this code means, what causes it, and how to troubleshoot and… Read More »
Overview SPN 111 FMI 3 is a fault code that indicates an issue with the engine coolant level sensor circuit. This code is commonly found in diesel engines and is used to alert technicians to potential problems with the engine coolant system. Description The SPN 111 FMI 3 fault code specifically points to a “Coolant… Read More »