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International A26 Fault Codes
Complete diagnostic trouble code reference for the International A26 heavy-duty diesel engine. 5 fault codes • Protocols: J1587, J1939
🔧 Engine Context: The International A26 is a 12.4-liter engine designed in collaboration with MAN (Germany). Unlike traditional diesel engines, the A26 uses a parent-bore cylinder design — cylinder walls are formed directly in the iron block. This eliminates liner cavitation issues but requires specialized rebuild procedures. The A26 features a simpler VGT turbocharger architecture than its competitors, but its DPF regeneration codes (SPN 3050) require immediate attention.
SPN 111 FMI 18
Engine Coolant Level Low
Component: Cooling System / EGR Cooler • J1939
SPN:111 FMI:18
SPN 641 FMI 5
VGT Turbo Actuator
Component: Variable Geometry Turbocharger (VGT) Actuator • J1939
SPN:641 FMI:5
SPN 3050 FMI 9
DPF Regeneration Too Frequent
Component: Diesel Particulate Filter (DPF) / Engine • J1939
SPN:3050 FMI:9
MID 128 PID 111 FMI 4
Coolant Level Sensor
Component: Engine Coolant Level Sensor • J1587
MID:128 PID:111
SPN 4334 FMI 4
DPF Differential Pressure Sensor Low Voltage
Component: DPF Differential Pressure Sensor / Wiring Harness • J1939
SPN:4334 FMI:4
Engine Series Coverage:
International A26 engine specifications and fault codes sourced from SAE J1939/J1587 public standards and OEM technical service documentation. Last reviewed 2026-08-04T02:30:39Z.