International (Navistar)
J1939 SPN/FMI
SPN 97 / FMI 31
International Fault Code SPN 97 FMI 31: Water In Fuel Indicator 1: Condition Exists
SPN 97 FMI 31 on International / Navistar trucks means: Water In Fuel Indicator 1: Condition Exists. The failure mode (FMI 31) is “condition exists”.
Code details
- Manufacturer
- International (Navistar)
- Applies to
- International A26 (2024–2025)
- Fault code
- SPN 97 FMI 31
- J1939 SPN
- 97
- FMI
- 31 — Condition exists
- 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 31 tells the shop the type of failure to test for: condition exists.
- 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
- International SA 33 SPN 97 FMI 4 — Water In Fuel Indicator
- International SA 33 SPN 97 FMI 6 — Water In Fuel Indicator
- Cummins Fault Code 428 — Water in Fuel Sensor Circuit - shorted high
- PACCAR Fault Code P2266 — Water in Fuel – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A49)
- PACCAR Fault Code P2275 — Water in Fuel – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A49)
- PACCAR Fault Code P2266 — Water-in-Fuel – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A49)
- PACCAR Fault Code P2275 — Water-In-Fuel – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A49)
Source: International A26 2024–2025 fault code list (Diesel Laptops). See also OBD-II codes.