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Detroit Diesel Diesel Engine Fault Codes

Browse 10 diagnostic trouble codes across 2 engine series. Protocols: J1939.

🔴 4 STOP ENGINE 🟡 3 Check Next Stop 🟠 3 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 — 2 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

DD15 Engine Series — 8 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