Detroit Diesel Turbo Fault Codes

Detroit Flash Code 1115 appears to be a combined or reformatted flash-code entry rather than a standard modern SPN/FMI format.

Detroit Flash Code 47 is an older style Detroit/DDEC code that may relate to air-system or turbo-related diagnostics depending on engine generation.

Detroit Flash Code 48 should be treated as an older flash-code style turbo or air-management warning until it is converted to the exact SPN/FMI definition for the engine.

Detroit Flash Code 64 is an older Detroit/DDEC style code that can appear in turbo or engine-air-system diagnostics depending on configuration.

Detroit SPN 103 FMI 0 commonly indicates turbocharger speed is above the normal range at the most severe level.

Detroit SPN 103 FMI 1 commonly indicates turbocharger speed is below the expected range.

Detroit SPN 103 FMI 4 usually indicates turbocharger speed sensor voltage below normal or shorted low.

Detroit SPN 1172 FMI 21 commonly relates to turbo compressor outlet, boost, or air-system pressure rationality depending on calibration.

Detroit SPN 1172 FMI 3 usually indicates a turbo/air-system pressure sensor circuit voltage above normal.

Detroit SPN 1172 FMI 4 usually indicates a turbo/air-system pressure sensor circuit voltage below normal.

Detroit SPN 1187 is commonly associated with turbocharger compressor outlet temperature, charge-air temperature, or an air-management temperature signal depending on calibration.

Detroit SPN 2629 FMI 21 commonly relates to turbocharger or air-management system performance rationality.

Detroit SPN 2629 FMI 3 usually indicates an air-management or turbo-related sensor circuit voltage above normal.

Detroit SPN 2629 FMI 4 usually indicates an air-management or turbo-related sensor circuit voltage below normal.

Detroit SPN 641 FMI 7 commonly indicates VGT actuator mechanical system not responding properly or turbo actuator position not matching command.