Detroit Diesel Derate Fault Codes

Detroit Flash Code 44 is commonly used as a warning or shutdown-related code depending on the DDEC generation and engine configuration.

Detroit Flash Code 45 should be handled as an older Detroit/DDEC flash-code style warning that may trigger reduced power or protection logic depending on application.

Detroit PID 404 is commonly tied to an older parameter identifier used in DDEC-era diagnostics and may appear in derate-related fault lists.

Detroit SPN 1001 may appear as a derate-related status or protection input depending on calibration.

Detroit SPN 1001 FMI 0 indicates the monitored SPN 1001 condition is above the most severe threshold or outside the normal operating limit, depending on the exact Detroit definition.

Detroit SPN 1001 FMI 8 indicates an abnormal frequency, pulse width, or update-rate type fault for the SPN 1001 signal.

Detroit SPN 110 FMI 0 normally indicates engine coolant temperature is above the normal range at the most severe level.

Detroit SPN 110 FMI 15 generally indicates engine coolant temperature is above normal but at the least severe level.

Detroit SPN 110 FMI 16 generally indicates engine coolant temperature is above normal at a moderate severity level.

Detroit SPN 3719 FMI 0 commonly indicates DPF soot load or aftertreatment restriction has reached a severe level.

Detroit SPN 3719 FMI 15 typically indicates DPF soot load is above normal at a lower severity level.

Detroit SPN 3719 FMI 16 usually indicates DPF soot load is above normal at a moderate severity level.

Detroit SPN 404 is commonly associated with an exhaust gas recirculation or emissions-control related parameter on some applications, but the exact description depends on engine generation and FMI.

Detroit SPN 5246 FMI 0 usually indicates an emissions inducement condition has reached a severe level.

Detroit SPN 5246 FMI 15 usually indicates an emissions inducement or derate warning at a lower severity level.

Detroit SPN 5246 FMI 16 usually indicates an emissions inducement or derate condition at a moderate severity level.