SPN 97 FMI 4: water in fuel, voltage low or shorted low
Water-in-fuel sensor voltage is low. Type another SPN and FMI to check it.
Water-in-fuel sensor voltage is low.
- Check the sensor wiring.
Paste the whole line if you like: "SPN 3251 FMI 0", "3251/0" or Deere's "003251.00". Plain-words guidance; the service manual wins.
What SPN 97 FMI 4 means
Water-in-fuel sensor voltage is low.
FMI 4: voltage low or shorted low
Signal voltage too low. Usually a wire shorted to ground or a bad sensor. (SAE J1939-73: Voltage below normal, or shorted to low source.)
How urgent it is
Schedule it. Put it on the next service. Watch for it to come back.
What to check first
- Check the sensor wiring.
Plain-words guidance for a foreman, not a repair procedure. Makers add their own codes and steps; the machine's service manual wins.
Other FMIs for SPN 97
| Code | What failed | Urgency |
|---|---|---|
| SPN 97 FMI 0 | above normal, most severe | Stop the machine |
| SPN 97 FMI 3 | voltage high or shorted high | Schedule it |
| SPN 97 FMI 15 | above normal, least severe | Fix it today |
| SPN 97 FMI 16 | above normal, moderately severe | Fix it today |
Next time, Dozer catches the code when it fires.
Plug a CAN logger into the machine's J1939 port, or connect the telematics you have. When a code fires, Dozer opens a repair ticket with the meaning, how urgent it is and what to check.
- The code, the machine and its hours on one ticket
- Severity sorted: keep working, plan a stop, or stop now
- The mechanic gets the checklist before they drive out
- Repeat codes on the same machine get flagged
LIVE EX-04 · SPN 3251 FMI 0 · plan a stop today Photo is an AI-generated stand-in, not a customer site.
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Questions crews ask
What does SPN 97 FMI 4 mean?
Water-in-fuel sensor voltage is low. FMI 4 means: Signal voltage too low. Usually a wire shorted to ground or a bad sensor.
Can I keep running with SPN 97 FMI 4?
Schedule it. It can wait for a planned stop, but don't let it ride for weeks. If the machine derates or the stop lamp is on, stop.
What should I check first for SPN 97 FMI 4?
Check the sensor wiring.
How do I clear SPN 97 FMI 4?
Fix the cause first. Most codes go inactive by themselves once the condition is gone and the engine has run a key cycle or two. Clearing it with a service tool without a fix only hides it until it comes back.
Which machines show SPN 97 FMI 4?
Any diesel that speaks SAE J1939: excavators, dozers, loaders, haul trucks, generators and on-road trucks with Cat, Cummins, Deere, Komatsu, Volvo, Kubota, Perkins and other engines. The SPN means the same thing on all of them; the fix steps can differ, so check the service manual.
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