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Check Engine Light — Possible Fault Codes
Found 37 fault codes associated with check engine light. Codes are sorted by severity — check STOP ENGINE codes first.
⚠️ 1 STOP ENGINE-level code associated with this symptom. Do not continue driving.
SPN 110 FMI 15
Engine Coolant Temperature excessive
Detroit Diesel DD15 • Component: Cooling System / Thermostat • J1939
SPN 4364 FMI 18
SCR Inducement Active
Cummins X15 • Component: Selective Catalytic Reduction (SCR) System • J1939
SPN 4334 FMI 7
DEF Dosing Valve Mechanical Fault
Cummins X15 • Component: DEF Dosing Valve (DMU) • J1939
SPN 1761 FMI 18
DEF Tank Level critically low
Detroit Diesel DD15 • Component: DEF Tank / DEF Level Sensor • J1939
SPN 520605 FMI 7
SCR System Mechanical Malfunction
Detroit Diesel DD15 • Component: SCR Catalyst / NOx Sensors • J1939
SPN 91 FMI 16
Accelerator Pedal Position
PACCAR MX-13 • Component: Accelerator Pedal Assembly (APP) • J1939
SPN 3050 FMI 9
DPF Regeneration Too Frequent
International A26 • Component: Diesel Particulate Filter (DPF) / Engine • J1939
SPN 191 FMI 16
Transmission Output Shaft Speed
Cummins ISX15 • Component: Transmission Output Speed Sensor (TOSS) • J1939
SPN 597 FMI 7
Brake Pedal Position Switch
Detroit Diesel DD15 • Component: Brake Pedal Position Switch / Air Brake System • J1939
SPN 174 FMI 0
Fuel Temperature
Volvo D13 • Component: Fuel Temperature Sensor / Fuel Cooler • J1939
MID 128 PID 102 FMI 3
Boost Pressure Sensor
Cummins ISX15 • Component: Intake Manifold Pressure Sensor • J1587
SPN 3031 FMI 9
DEF Quality Abnormal
Cummins X15 • Component: DEF Quality Sensor / DEF Tank • J1939
SPN 4342 FMI 4
NOx Sensor Outlet
Detroit Diesel DD13 • Component: NOx Sensor (Outlet) / Wiring • J1939
SPN 3226 FMI 9
DOC Inlet Temperature Sensor
Detroit Diesel DD13 • Component: Diesel Oxidation Catalyst (DOC) Inlet Temp Sensor • J1939
SPN 3031 FMI 9
DEF Quality Sensor
Volvo D13 • Component: DEF Concentration Sensor • J1939
MID 128 PSID 90 FMI 4
EGR Differential Pressure Sensor
Volvo D13 • Component: EGR Differential Pressure Sensor / EGR Valve • J1587
SPN 107 FMI 16
Air Filter Restriction excessive
Volvo D13 • Component: Air Filter / Air Intake System • J1939
SPN 411 FMI 16
Exhaust Gas Recirculation (EGR) Differential Pressure
PACCAR MX-13 • Component: EGR Differential Pressure Sensor / EGR System • J1939
MID 128 PID 105 FMI 10
Intake Manifold Temperature
PACCAR MX-13 • Component: Intake Manifold Temperature Sensor • J1587
SPN 97 FMI 15
Water in Fuel Indicator
Volvo D13 • Component: Water-in-Fuel Sensor / Fuel Filter Assembly • J1939
SPN 105 FMI 3
Intake Manifold Temperature Sensor
Volvo D13 • Component: Intake Manifold Air Temperature (IAT) Sensor • J1939
SPN 168 FMI 0
Battery Voltage High
Volvo D13 • Component: Alternator / Voltage Regulator • J1939
SPN 441 FMI 2
Cruise Control Switch Erratic
Volvo D13 • Component: Cruise Control Switch / Steering Column Switch Pack • J1939
SPN 5202 FMI 19
Engine Configuration Error
Volvo D13 • Component: Engine Control Module (ECM) Configuration • J1939
SPN 4364 FMI 18
SCR NOx Conversion Low
International A26 • Component: SCR Catalyst System / DEF Dosing • J1939
SPN 3361 FMI 7
DPF Differential Pressure Fault
International A26 • Component: DPF Differential Pressure Sensor / DPF Assembly • J1939
SPN 3480 FMI 4
Intake Manifold Pressure Sensor
International A26 • Component: Intake Manifold Pressure (MAP) Sensor / Wiring • J1939
SPN 4348 FMI 14
DEF Quality Out of Range
International A26 • Component: DEF Quality Sensor / DEF System • J1939
SPN 3031 FMI 16
Exhaust Gas Temperature High
International A26 • Component: Aftertreatment Exhaust Gas Temperature (EGT) Sensor • J1939
SPN 4364 FMI 18
SCR NOx Conversion Low
Detroit Diesel DD13 • Component: SCR Catalyst System / DEF Dosing • J1939
SPN 3361 FMI 7
DPF Differential Pressure Fault
Detroit Diesel DD13 • Component: DPF Differential Pressure Sensor / DPF Assembly • J1939
SPN 108 FMI 3
Barometric Pressure Sensor Fault
Detroit Diesel DD13 • Component: Barometric Pressure Sensor / ECM (Integrated) • J1939
SPN 158 FMI 2
Engine Start-Up Aid Erratic
Detroit Diesel DD13 • Component: Engine Start-Up Aid / Intake Grid Heater • J1939
SPN 4251 FMI 0
DOC Outlet Temperature High
Detroit Diesel DD13 • Component: DOC Outlet Temperature Sensor / Aftertreatment • J1939
SPN 5203 FMI 14
EGR Delta Pressure Fault
Detroit Diesel DD13 • Component: EGR Differential Pressure Sensor / EGR System • J1939
SPN 4348 FMI 14
DEF Quality Out of Range
PACCAR MX-13 • Component: DEF Quality Sensor / DEF System • J1939
SPN 3556 FMI 5
NOx Sensor Heater Circuit Fault
PACCAR MX-13 • Component: NOx Sensor (Outlet) / Heater Circuit / Wiring • J1939
⚠️ Diagnostic Note:
Symptoms can have multiple root causes. Always verify with a diagnostic scan tool before replacing parts. The fault codes listed above are possible matches for check engine light based on SAE J1939/J1587 fault code definitions and OEM service documentation.