DTC Hub Commercial Truck & Diesel Fault Codes
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Check Engine Light — Possible Fault Codes

Found 19 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
🔴 STOP ENGINE
SPN 4364 FMI 18
SCR Inducement Active
Cummins X15 • Component: Selective Catalytic Reduction (SCR) System • J1939
🟡 CHECK AT NEXT STOP
SPN 4334 FMI 7
DEF Dosing Valve Mechanical Fault
Cummins X15 • Component: DEF Dosing Valve (DMU) • J1939
🟡 CHECK AT NEXT STOP
SPN 1761 FMI 18
DEF Tank Level critically low
Detroit Diesel DD15 • Component: DEF Tank / DEF Level Sensor • J1939
🟡 CHECK AT NEXT STOP
SPN 520605 FMI 7
SCR System Mechanical Malfunction
Detroit Diesel DD15 • Component: SCR Catalyst / NOx Sensors • J1939
🟡 CHECK AT NEXT STOP
SPN 91 FMI 16
Accelerator Pedal Position
PACCAR MX-13 • Component: Accelerator Pedal Assembly (APP) • J1939
🟡 CHECK AT NEXT STOP
SPN 3050 FMI 9
DPF Regeneration Too Frequent
International A26 • Component: Diesel Particulate Filter (DPF) / Engine • J1939
🟡 CHECK AT NEXT STOP
SPN 191 FMI 16
Transmission Output Shaft Speed
Cummins ISX15 • Component: Transmission Output Speed Sensor (TOSS) • J1939
🟡 CHECK AT NEXT STOP
SPN 597 FMI 7
Brake Pedal Position Switch
Detroit Diesel DD15 • Component: Brake Pedal Position Switch / Air Brake System • J1939
🟡 CHECK AT NEXT STOP
SPN 174 FMI 0
Fuel Temperature
Volvo D13 • Component: Fuel Temperature Sensor / Fuel Cooler • J1939
🟡 CHECK AT NEXT STOP
MID 128 PID 102 FMI 3
Boost Pressure Sensor
Cummins ISX15 • Component: Intake Manifold Pressure Sensor • J1587
🟠 CHECK SOON
SPN 3031 FMI 9
DEF Quality Abnormal
Cummins X15 • Component: DEF Quality Sensor / DEF Tank • J1939
🟠 CHECK SOON
SPN 4342 FMI 4
NOx Sensor Outlet
Detroit Diesel DD13 • Component: NOx Sensor (Outlet) / Wiring • J1939
🟠 CHECK SOON
SPN 3226 FMI 9
DOC Inlet Temperature Sensor
Detroit Diesel DD13 • Component: Diesel Oxidation Catalyst (DOC) Inlet Temp Sensor • J1939
🟠 CHECK SOON
SPN 3031 FMI 9
DEF Quality Sensor
Volvo D13 • Component: DEF Concentration Sensor • J1939
🟠 CHECK SOON
MID 128 PSID 90 FMI 4
EGR Differential Pressure Sensor
Volvo D13 • Component: EGR Differential Pressure Sensor / EGR Valve • J1587
🟠 CHECK SOON
SPN 107 FMI 16
Air Filter Restriction excessive
Volvo D13 • Component: Air Filter / Air Intake System • J1939
🟠 CHECK SOON
SPN 411 FMI 16
Exhaust Gas Recirculation (EGR) Differential Pressure
PACCAR MX-13 • Component: EGR Differential Pressure Sensor / EGR System • J1939
🟠 CHECK SOON
MID 128 PID 105 FMI 10
Intake Manifold Temperature
PACCAR MX-13 • Component: Intake Manifold Temperature Sensor • J1587
🟠 CHECK SOON
⚠️ 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.