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Cummins Diesel Engine Fault Codes
Browse 49 diagnostic trouble codes across 3 engine series. Protocols: J1587, J1939.
🔴 10 STOP ENGINE
🟡 10 Check Next Stop
🟠 16 Check Soon
Cummins Inc. has been the undisputed leader in heavy-duty diesel engines in North America for over 100 years. The ISX15 engine — now X15 — powers approximately 40% of all Class 8 trucks on American highways. Cummins fault codes use the standard SAE J1939 protocol, but Cummins also maintains an extensive library of proprietary fault codes accessible through Cummins INSITE. Our database covers both public SPN/FMI codes and Cummins-specific interpretations.
ISX15 Engine Series — 39 fault codes
SPN 1569 FMI 31
Engine Protection Torque Derate
SPN 102 FMI 18
Intake Manifold Pressure critically low
SPN 111 FMI 18
Engine Coolant Level critically low
SPN 639 FMI 9
J1939 CAN Bus Communication Loss
SPN 1322 FMI 31
Misfire Detected on Cylinder 6
MID 128 SID 1 FMI 5
Injector Cylinder 1 Circuit
SPN 191 FMI 16
Transmission Output Shaft Speed
MID 128 PID 102 FMI 3
Boost Pressure Sensor
SPN 625 FMI 2
J1939 Multiplexing Error
SPN 1761 FMI 19
AFT Outlet NOx Signal Erratic
SPN 3556 FMI 0
DPF Intake Temperature High
SPN 100 FMI 1
Engine Oil Pressure Low
SPN 110 FMI 0
Engine Coolant Temperature High
SPN 105 FMI 3
Intake Manifold Temp Sensor Voltage High
SPN 111 FMI 1
Engine Coolant Level Low
SPN 1569 FMI 0
Engine Torque Derate Active
SPN 3361 FMI 7
DPF Differential Pressure Mechanical Error
SPN 4251 FMI 0
DPF Outlet Temperature High
SPN 5444 FMI 0
Fuel Filter Differential Pressure High
SPN 5454 FMI 7
Crankcase Breather Oil Separator Fault
SPN 94 FMI 1
Fuel Delivery Pressure Low
SPN 157 FMI 16
Fuel Injection Pump Pressure Low
SPN 157 FMI 0
Fuel Injection Pump Pressure High
SPN 102 FMI 4
Boost Pressure Sensor Low Voltage
SPN 3251 FMI 0
DPF Soot Load Critical
SPN 3251 FMI 16
DPF Soot Level High
SPN 3246 FMI 0
SCR NOx Conversion Low
SPN 3226 FMI 4
Outlet NOx Sensor Voltage Low
SPN 4076 FMI 4
DEF Doser Circuit Low Voltage
SPN 3364 FMI 2
DEF Injector Data Erratic
SPN 4364 FMI 18
SCR Inducement Derate Active
SPN 1761 FMI 31
DEF Quality Below Specification
SPN 3031 FMI 16
DEF Tank Level Low
SPN 5484 FMI 0
DPF Auto Regen Failed
SPN 5246 FMI 0
SCR Severe Derate Active
SPN 4331 FMI 16
Outlet NOx Above Threshold
SPN 4752 FMI 0
EGR Valve Position High
SPN 3480 FMI 4
NOx Sensor Heater Voltage Low
SPN 108 FMI 3
Baro Pressure Sensor Voltage High
X15 Engine Series — 5 fault codes
SPN 4364 FMI 18
SCR Inducement Active
SPN 4334 FMI 7
DEF Dosing Valve Mechanical Fault
SPN 3031 FMI 9
DEF Quality Abnormal
SPN 5246 FMI 15
Fuel Injector Driver Circuit Fault
SPN 3482 FMI 0
NOx Conversion Efficiency High
ISX Engine Series — 5 fault codes
SPN 4250 FMI 4
Aftertreatment Purge Air Actuator Circuit Low
SPN 5031 FMI 4
Aftertreatment Intake NOx Sensor Low Voltage
SPN 3556 FMI 5
Aftertreatment Outlet NOx Sensor Open Circuit
SPN 2659 FMI 7
SCR Doser Mechanical Fault
SPN 4076 FMI 2
Aftertreatment Fuel Pressure Sensor Erratic