International truck repair & roadside — mobile diesel mechanics
International (Navistar, now part of Traton) builds the LT, LoneStar, and RH tractors. Newer trucks run the International A26 12.4L engine, with the Cummins X15 offered as an alternative. Aftertreatment and EGR faults dominate roadside calls; older MaxxForce-era trucks had more EGR-related issues.
Send one request — nearby diesel techs see your truck and fault info before they quote you.
Common International problems & roadside issues
- A26 aftertreatment faults (DPF regen, DEF dosing, SCR efficiency)
- DEF quality / NOx-sensor faults driving SCR inducement
- EGR cooler and EGR valve faults
- Electrical / J1939 datalink faults from connector corrosion
- Cooling and air-system faults that trigger engine-protection derates
International engines
Pick your engine for engine-specific common faults and fault-code help.
The International A26 is a 12.4L inline-six derived from the MAN D26, used across the LT and LoneStar. It's a clean-sheet design that left the troubled MaxxForce era behind; its common roadside faults are the usual aftertreatment and EGR codes.
Cummins X15 15.0LThe Cummins X15 is the 15L option in the International LT for fleets that want a 15-liter and the Cummins service network. Its aftertreatment and EGR systems account for most fault codes.
Throwing a fault code?
Look up what a heavy-duty SPN/FMI code means — DPF, DEF/SCR, engine protection, oil pressure, and more — then get a mechanic dispatched. Open the fault-code lookup ›
FAQ
Yes — most International roadside calls are aftertreatment (DPF/DEF/SCR), electrical, air-system, or EGR faults that a mobile diesel tech can diagnose and often resolve on-site with a scan tool. Severe internal failures or a fully plugged DPF need a shop.
The most common International roadside issues are: A26 aftertreatment faults (DPF regen, DEF dosing, SCR efficiency); DEF quality / NOx-sensor faults driving SCR inducement; EGR cooler and EGR valve faults.
International trucks are commonly spec'd with International A26, Cummins X15. Pick your engine below for engine-specific fault-code help.
Find a International mechanic near you
General repair guidance for heavy-duty diesel trucks. Not a substitute for a scan-tool diagnosis on your specific International.