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Detroit Diesel DD13 Fault Codes
Complete diagnostic trouble code reference for the Detroit Diesel DD13 heavy-duty diesel engine. 7 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 4342 FMI 4
NOx Sensor Outlet
Component: NOx Sensor (Outlet) / Wiring • J1939
SPN:4342 FMI:4
SPN 3226 FMI 9
DOC Inlet Temperature Sensor
Component: Diesel Oxidation Catalyst (DOC) Inlet Temp Sensor • J1939
SPN:3226 FMI:9
SPN 102 FMI 4
Turbocharger Boost Pressure Low
Component: Turbocharger / Boost Pressure Sensor / Intake System • J1939
SPN:102 FMI:4
SPN 524287 FMI 7
DEF Doser Unit Mechanical Failure
Component: DEF Dosing Valve / Doser Unit / SCR System • J1939
SPN:524287 FMI:7
SPN 651 FMI 5
Cylinder 1 Fuel Injector Circuit Low
Component: Fuel Injector #1 / Injector Driver Circuit / ECM • J1939
SPN:651 FMI:5
SPN 110 FMI 0
Engine Coolant Temperature High
Component: Cooling System / Coolant Temperature Sensor / Water Pump / Thermostat • J1939
SPN:110 FMI:0
SPN 4360 FMI 18
SCR NOx Conversion Efficiency Low
Component: SCR Catalyst / DEF System / NOx Sensors • J1939
SPN:4360 FMI:18
Engine Series Coverage:
Detroit Diesel DD13 engine specifications and fault codes sourced from SAE J1939/J1587 public standards and OEM technical service documentation. Last reviewed 2026-08-04T02:30:39Z.