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Detroit Diesel DD15 Fault Codes
Complete diagnostic trouble code reference for the Detroit Diesel DD15 heavy-duty diesel engine. 24 fault codes • Protocols: J1939
🔧 Engine Context: The Detroit DD series is the backbone of the Freightliner fleet. The DD15 is the 14.8-liter engine for long-haul operations, while the 12.8-liter DD13 serves regional applications. Both use Detroit's Amplified Common Rail (ACR) fuel system and BlueTec SCR aftertreatment. Common fault codes include ECM communication issues (SPN 625), SCR system malfunctions (SPN 520605), and DEF system failures.
SPN 625 FMI 9
ECM Communication Lost
Component: Engine Control Module / CAN Bus • J1939
SPN:625 FMI:9
SPN 100 FMI 1
Engine Oil Pressure critically low
Component: Oil Pump / Oil Pressure Sensor • J1939
SPN:100 FMI:1
SPN 110 FMI 15
Engine Coolant Temperature excessive
Component: Cooling System / Thermostat • J1939
SPN:110 FMI:15
SPN 164 FMI 18
Fuel Rail Pressure critically low
Component: High Pressure Fuel System • J1939
SPN:164 FMI:18
SPN 1761 FMI 18
DEF Tank Level critically low
Component: DEF Tank / DEF Level Sensor • J1939
SPN:1761 FMI:18
SPN 520605 FMI 7
SCR System Mechanical Malfunction
Component: SCR Catalyst / NOx Sensors • J1939
SPN:520605 FMI:7
SPN 597 FMI 7
Brake Pedal Position Switch
Component: Brake Pedal Position Switch / Air Brake System • J1939
SPN:597 FMI:7
SPN 84 FMI 19
Vehicle Speed Signal
Component: ABS Module / J1939 Data Link • J1939
SPN:84 FMI:19
SPN 91 FMI 3
Throttle Position Sensor Voltage High
Component: Throttle Position Sensor / Pedal Assembly • J1939
SPN:91 FMI:3
SPN 132 FMI 4
Engine Oil Pressure Sensor Voltage Low
Component: Engine Oil Pressure Sensor / Lubrication System • J1939
SPN:132 FMI:4
SPN 1761 FMI 5
Aftertreatment Outlet NOx Sensor Open Circuit
Component: NOx Sensor 2 (Outlet) / SCR System • J1939
SPN:1761 FMI:5
SPN 4331 FMI 7
DPF Soot Load Excessive
Component: Diesel Particulate Filter / Regeneration System • J1939
SPN:4331 FMI:7
SPN 5246 FMI 15
Cylinder 1 Misfire Detected
Component: Cylinder 1 Injector / Valve Train • J1939
SPN:5246 FMI:15
SPN 4364 FMI 18
SCR Catalyst System Performance Low
Component: SCR Catalyst / NOx Conversion System • J1939
SPN:4364 FMI:18
SPN 3251 FMI 0
DPF Soot Load Percent High
Component: DPF / Exhaust Aftertreatment System • J1939
SPN:3251 FMI:0
SPN 4334 FMI 5
DPF Inlet Temperature Sensor Open Circuit
Component: DPF Inlet Temperature Sensor / Aftertreatment Harness • J1939
SPN:4334 FMI:5
SPN 4752 FMI 0
EGR Differential Pressure High
Component: EGR Valve / EGR Differential Pressure Sensor / EGR Cooler • J1939
SPN:4752 FMI:0
SPN 1761 FMI 9
DEF Doser Communication Lost
Component: DEF Dosing Unit / DEF Doser / Dosing Control Module • J1939
SPN:1761 FMI:9
SPN 3480 FMI 4
EGT Sensor 1 Voltage Low
Component: Exhaust Gas Temperature Sensor 1 (Inlet) / Wiring Harness • J1939
SPN:3480 FMI:4
SPN 5246 FMI 0
SCR NOx Conversion Efficiency High
Component: SCR Catalyst / NOx Sensors / DEF Dosing System • J1939
SPN:5246 FMI:0
SPN 4076 FMI 0
DPF Soot Load Excessive
Component: Diesel Particulate Filter / DPF Differential Pressure Sensor / Doser • J1939
SPN:4076 FMI:0
SPN 639 FMI 2
Accelerator Pedal Position Erratic
Component: Accelerator Pedal Position Sensor / Pedal Assembly • J1939
SPN:639 FMI:2
SPN 520604 FMI 19
DEF Controller Communication Error
Component: SCR DEF Dosing Controller / CAN Bus Communication • J1939
SPN:520604 FMI:19
SPN 639 FMI 5
J1939 DR0 Output Open Circuit
Component: J1939 Data Link / DR0 Backbone Circuit • J1939
SPN:639 FMI:5
Engine Series Coverage:
Detroit Diesel DD15 engine specifications and fault codes sourced from SAE J1939/J1587 public standards and OEM technical service documentation. Last reviewed 2026-08-04T02:30:39Z.