International Fault Codes — Complete Guide

International SPN/FMI codes cover A26, N13, MaxxForce 13. This hub lists 38 diagnostic pages with symptoms, ranked causes, scan-tool steps, and 2026 repair costs — use INSITE, DiagnosticLink, or EST depending on your engine family.

By Professional Diesel Repair TeamPublished: January 2026Last updated: September 2026

How We Tested and Verified

International fault code definitions cross-checked against SAE J1939-71 and International OEM service bulletins. Diagnostic tips validated by field technicians September 2026.

International Engine Platforms

International engines covered on this site include: A26, N13, MaxxForce 13. Diagnostic procedures vary by platform — always verify against your specific engine serial number and calibration.

Most Common International Fault Codes

Code	Component	Severity	Definition
SPN 100 FMI 1	Engine Oil Pressure Sensor	Critical	Engine Oil Pressure - Data Valid But Below Normal Operating Range - Most Severe Level
SPN 100 FMI 18	Engine Oil Pressure Sensor	Critical	Engine Oil Pressure - Data Valid But Below Normal Operational Range - Moderately Severe Level
SPN 1209 FMI 0	Exhaust Pressure Sensor	Critical	Engine Exhaust Gas Pressure - Data Valid But Above Normal Operational Range - Most Severe Level
SPN 190 FMI 0	Engine Speed Sensor Circuit	Critical	Engine Speed - Data Valid But Above Normal Operational Range
SPN 636 FMI 5	Engine Position Sensor	Critical	Crankshaft Position Sensor - Current Below Normal or Open Circuit (FMI 5)
SPN 8064 FMI 12	Crankshaft Position Sensor (CKP)	Critical	Engine Crankshaft Position - Bad Intelligent Device or Component (Signal Inactive)
SPN A26-DEF FMI N/A	International A26 DEF System	High	Common DEF system faults on International A26 engines — pump, heater, quality sensor, and dosing valve failures diagnosed with ServiceMaxx
SPN 1209 FMI 16	Engine Exhaust Gas Pressure Sensor (Exhaust Backpressure)	High	Engine Exhaust Gas Pressure - Data Valid But Above Normal Operating Range - Moderately Severe Level
SPN 1322 FMI 31	Multiple Cylinder Misfire Detection	High	Engine Misfire for Multiple Cylinders - Condition Exists
SPN 168 FMI 4	Battery / Charging System Circuit	High	Electrical Potential (Voltage) - Voltage Below Normal, Circuit Shorted Low
SPN 3216 FMI 0	SCR Intake NOx Sensor	High	Aftertreatment SCR Intake NOx Sensor - Data Valid But High
SPN 3226 FMI 0	SCR Outlet NOx Sensor	High	Aftertreatment SCR Outlet NOx Sensor - Data Valid But High
SPN 3364 FMI 9	DEF Quality Sensor	High	Aftertreatment 1 DEF Tank - Liquid Quality Parameter - Abnormal Update Rate
SPN 3480 FMI 1	HC Doser Fuel Supply Pressure	High	HC Doser Fuel Supply Pressure - Data Valid But Below Normal Operational Range - Moderately Severe Level
SPN 3719 FMI 16	DPF Ash Load	High	Aftertreatment Diesel Particulate Filter Ash Load - Data Valid But Above Normal Operating Range
SPN 4094 FMI 3	DPF Soot Load Percent Sensor	High	Aftertreatment Diesel Particulate Filter Soot Load Percent - Voltage Above Normal, Or Shorted To High Source
SPN 4358 FMI 14	SCR Catalyst Exhaust Differential Pressure	High	Aftertreatment 1 SCR Catalyst Exhaust Gas Differential Pressure - Special Instructions
SPN 4364 FMI 18	SCR NOx Efficiency	High	Aftertreatment SCR NOx Conversion Efficiency - Data Valid But Below Normal
SPN 513 FMI 3	Actual Engine Percent Torque	High	Actual engine percent torque signal voltage above normal — the calculated torque value transmitted over J1939 has exceeded its upper data range. No physical torque sensor exists; this is a calculated broadcast parameter.
SPN 5357 FMI 0	Fuel Injection Quantity (Multiple Cylinders)	High	Engine Fuel Injection Quantity Error for Multiple Cylinders - Data Valid But Above Normal Operational Range - Most Severe Level

International-Specific Diagnostic Tips

NAVISTAR Diagnostic Service Worker (DSW) required for A26 aftertreatment tests.
MaxxForce EGR cooler failures are endemic — pressure-test before chasing NOx codes.
A26 high-pressure fuel pump timing faults mimic injector failure; check cam/crank correlation first.