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Detroit Diesel Diesel Engine Fault Codes

Browse 44 diagnostic trouble codes across 2 engine series. Protocols: J1939.

🔴 10 STOP ENGINE 🟡 20 Check Next Stop 🟠 13 Check Soon

Detroit Diesel Corporation, a subsidiary of Daimler Truck North America, produces the DD-series engines powering Freightliner and Western Star trucks. The DD15 is Detroit's flagship engine, known for its overhead camshaft valve train and Amplified Common Rail fuel system technology. Detroit codes are notoriously detailed — a single SPN 520605 can have multiple interpretations depending on fault context. Our database includes Detroit-specific diagnostic context from DTNA service manuals.

DD13 Engine Series — 14 fault codes

SPN 4342 FMI 4
NOx Sensor Outlet
🟠 CHECK SOON
Component: NOx Sensor (Outlet) / Wiring • J1939
SPN 3226 FMI 9
DOC Inlet Temperature Sensor
🟠 CHECK SOON
Component: Diesel Oxidation Catalyst (DOC) Inlet Temp Sensor • J1939
SPN 102 FMI 4
Turbocharger Boost Pressure Low
🟡 CHECK AT NEXT STOP
Component: Turbocharger / Boost Pressure Sensor / Intake System • J1939
SPN 524287 FMI 7
DEF Doser Unit Mechanical Failure
🟡 CHECK AT NEXT STOP
Component: DEF Dosing Valve / Doser Unit / SCR System • J1939
SPN 651 FMI 5
Cylinder 1 Fuel Injector Circuit Low
🟡 CHECK AT NEXT STOP
Component: Fuel Injector #1 / Injector Driver Circuit / ECM • J1939
SPN 110 FMI 0
Engine Coolant Temperature High
🔴 STOP ENGINE
Component: Cooling System / Coolant Temperature Sensor / Water Pump / Thermostat • J1939
SPN 4360 FMI 18
SCR NOx Conversion Efficiency Low
🟡 CHECK AT NEXT STOP
Component: SCR Catalyst / DEF System / NOx Sensors • J1939
SPN 1569 FMI 31
Engine Protection Torque Derate
🔴 STOP ENGINE
Component: Engine Control Module (ECM) / Engine Protection System • J1939
SPN 4364 FMI 18
SCR NOx Conversion Low
🟠 CHECK SOON
Component: SCR Catalyst System / DEF Dosing • J1939
SPN 3361 FMI 7
DPF Differential Pressure Fault
🟠 CHECK SOON
Component: DPF Differential Pressure Sensor / DPF Assembly • J1939
SPN 108 FMI 3
Barometric Pressure Sensor Fault
🟠 CHECK SOON
Component: Barometric Pressure Sensor / ECM (Integrated) • J1939
SPN 158 FMI 2
Engine Start-Up Aid Erratic
🔵 INFO
Component: Engine Start-Up Aid / Intake Grid Heater • J1939
SPN 4251 FMI 0
DOC Outlet Temperature High
🟠 CHECK SOON
Component: DOC Outlet Temperature Sensor / Aftertreatment • J1939
SPN 5203 FMI 14
EGR Delta Pressure Fault
🟠 CHECK SOON
Component: EGR Differential Pressure Sensor / EGR System • J1939

DD15 Engine Series — 30 fault codes

SPN 625 FMI 9
ECM Communication Lost
🔴 STOP ENGINE
Component: Engine Control Module / CAN Bus • J1939
SPN 100 FMI 1
Engine Oil Pressure critically low
🔴 STOP ENGINE
Component: Oil Pump / Oil Pressure Sensor • J1939
SPN 110 FMI 15
Engine Coolant Temperature excessive
🔴 STOP ENGINE
Component: Cooling System / Thermostat • J1939
SPN 164 FMI 18
Fuel Rail Pressure critically low
🔴 STOP ENGINE
Component: High Pressure Fuel System • J1939
SPN 1761 FMI 18
DEF Tank Level critically low
🟡 CHECK AT NEXT STOP
Component: DEF Tank / DEF Level Sensor • J1939
SPN 520605 FMI 7
SCR System Mechanical Malfunction
🟡 CHECK AT NEXT STOP
Component: SCR Catalyst / NOx Sensors • J1939
SPN 597 FMI 7
Brake Pedal Position Switch
🟡 CHECK AT NEXT STOP
Component: Brake Pedal Position Switch / Air Brake System • J1939
SPN 84 FMI 19
Vehicle Speed Signal
🟠 CHECK SOON
Component: ABS Module / J1939 Data Link • J1939
SPN 91 FMI 3
Throttle Position Sensor Voltage High
🟡 CHECK AT NEXT STOP
Component: Throttle Position Sensor / Pedal Assembly • J1939
SPN 132 FMI 4
Engine Oil Pressure Sensor Voltage Low
🔴 STOP ENGINE
Component: Engine Oil Pressure Sensor / Lubrication System • J1939
SPN 1761 FMI 5
Aftertreatment Outlet NOx Sensor Open Circuit
🟠 CHECK SOON
Component: NOx Sensor 2 (Outlet) / SCR System • J1939
SPN 4331 FMI 7
DPF Soot Load Excessive
🟡 CHECK AT NEXT STOP
Component: Diesel Particulate Filter / Regeneration System • J1939
SPN 5246 FMI 15
Cylinder 1 Misfire Detected
🟡 CHECK AT NEXT STOP
Component: Cylinder 1 Injector / Valve Train • J1939
SPN 520604 FMI 19
DEF Controller Communication Error
🟡 CHECK AT NEXT STOP
Component: SCR DEF Dosing Controller / CAN Bus Communication • J1939
SPN 639 FMI 5
J1939 DR0 Output Open Circuit
🟡 CHECK AT NEXT STOP
Component: J1939 Data Link / DR0 Backbone Circuit • J1939
SPN 3055 FMI 16
DPF Outlet Temperature High
🔴 STOP ENGINE
Component: Diesel Particulate Filter / DPF Temperature Sensors • J1939
SPN 4364 FMI 18
SCR Catalyst System Performance Low
🟡 CHECK AT NEXT STOP
Component: SCR Catalyst / NOx Conversion System • J1939
SPN 3251 FMI 0
DPF Soot Load Percent High
🟠 CHECK SOON
Component: DPF / Exhaust Aftertreatment System • J1939
SPN 4334 FMI 5
DPF Inlet Temperature Sensor Open Circuit
🟡 CHECK AT NEXT STOP
Component: DPF Inlet Temperature Sensor / Aftertreatment Harness • J1939
SPN 4752 FMI 0
EGR Differential Pressure High
🟡 CHECK AT NEXT STOP
Component: EGR Valve / EGR Differential Pressure Sensor / EGR Cooler • J1939
SPN 1761 FMI 9
DEF Doser Communication Lost
🟡 CHECK AT NEXT STOP
Component: DEF Dosing Unit / DEF Doser / Dosing Control Module • J1939
SPN 3480 FMI 4
EGT Sensor 1 Voltage Low
🟡 CHECK AT NEXT STOP
Component: Exhaust Gas Temperature Sensor 1 (Inlet) / Wiring Harness • J1939
SPN 5246 FMI 0
SCR NOx Conversion Efficiency High
🔴 STOP ENGINE
Component: SCR Catalyst / NOx Sensors / DEF Dosing System • J1939
SPN 4076 FMI 0
DPF Soot Load Excessive
🔴 STOP ENGINE
Component: Diesel Particulate Filter / DPF Differential Pressure Sensor / Doser • J1939
SPN 639 FMI 2
Accelerator Pedal Position Erratic
🟠 CHECK SOON
Component: Accelerator Pedal Position Sensor / Pedal Assembly • J1939
SPN 3251 FMI 2
EGR Differential Pressure Erratic
🟠 CHECK SOON
Component: EGR Differential Pressure Sensor / EGR System • J1939
SPN 4334 FMI 15
Aftertreatment Fuel Pressure High
🟡 CHECK AT NEXT STOP
Component: Aftertreatment Fuel System / Seventh Injector • J1939
SPN 4752 FMI 3
EGR Valve Position Sensor Voltage High
🟠 CHECK SOON
Component: EGR Valve Position Sensor / EGR Valve • J1939
SPN 3719 FMI 0
Engine Oil Level Low
🟡 CHECK AT NEXT STOP
Component: Engine Oil Level Sensor / Oil Pan • J1939
SPN 651 FMI 5
Cylinder 1 Injector Circuit Low / Open
🟡 CHECK AT NEXT STOP
Component: Fuel Injector #1 / ACRS Injector Driver / ECM • J1939