International (Navistar)
J1939 SPN/FMI
SPN 5024 / FMI 10
International Fault Code SPN 5024 FMI 10: Aftertreatment 1 Intake NOx Sensor Heater Ratio: Abnormal Rate of Change
SPN 5024 FMI 10 on International / Navistar trucks means: Aftertreatment 1 Intake NOx Sensor Heater Ratio: Abnormal Rate of Change. The failure mode (FMI 10) is “abnormal rate of change”.
Code details
- Manufacturer
- International (Navistar)
- Applies to
- International A26 (2024–2025)
- Fault code
- SPN 5024 FMI 10
- J1939 SPN
- 5024
- FMI
- 10 — Abnormal rate of change
- Truck models in source
- 3200, 4100, 4300, 4400, 7300, 7400, 7500, 7600, 7700, 8500, 8600, BE 200, CE Bus, CXT, DuraStar, LoneStar, MXT, ProStar, RXT, TranStar, WorkStar
What to do next
- Read active and inactive codes with the OEM service tool (Diamond Logic Builder can clear previously active codes) and note the occurrence count.
- FMI 10 tells the shop the type of failure to test for: abnormal rate of change.
- Have a heavy-duty diesel technician confirm the fault against the engine or chassis service manual before replacing parts.
Get this code diagnosed
Send one request and nearby diesel shops and mobile mechanics can quote the repair.
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Related fault codes
- PACCAR Fault Code P3867 — PM Sensor – Power Supply Intermittent
- PACCAR Fault Code P3868 — PM Sensor – Voltage Too High or Short Circuit to Supply
- PACCAR Fault Code P3867 — Heater Element NOx Sensor Before Catalyst Performance – Malfunction
- PACCAR Fault Code P3868 — Heater Element NOx Sensor Before Catalyst – Warm-up Failed
Source: International A26 2024–2025 fault code list (Diesel Laptops). See also OBD-II codes.