International A26 Fault Codes

Complete diagnostic trouble code reference for the International A26 heavy-duty diesel engine. 4 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

🔴 STOP ENGINE

SPN 641 FMI 5

VGT Turbo Actuator

Component: Variable Geometry Turbocharger (VGT) Actuator • J1939 SPN:641 FMI:5

🟡 CHECK AT NEXT STOP

SPN 3050 FMI 9

DPF Regeneration Too Frequent

Component: Diesel Particulate Filter (DPF) / Engine • J1939 SPN:3050 FMI:9

🟡 CHECK AT NEXT STOP

MID 128 PID 111 FMI 4

Coolant Level Sensor

Component: Engine Coolant Level Sensor • J1587 MID:128 PID:111

🟠 CHECK SOON

Engine Series Coverage: International A26 engine specifications and fault codes sourced from SAE J1939/J1587 public standards and OEM technical service documentation. Last reviewed 2026-07-06T15:05:01Z.