SPN 168 FMI 15: battery voltage, above normal, least severe
Battery voltage is a bit high. Type another SPN and FMI to check it.
Battery voltage is a bit high.
- Test the alternator output.
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 168 FMI 15 means
Battery voltage is a bit high.
FMI 15: above normal, least severe
A bit high. A warning, not a shutdown yet. (SAE J1939-73: Data valid but above normal operating range, least severe level.)
How urgent it is
Schedule it. Put it on the next service. Watch for it to come back.
What to check first
- Test the alternator output.
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 168
| Code | What failed | Urgency |
|---|---|---|
| SPN 168 FMI 0 | above normal, most severe | Fix it today |
| SPN 168 FMI 1 | below normal, most severe | Fix it today |
| SPN 168 FMI 2 | erratic or intermittent | Fix it today |
| SPN 168 FMI 17 | below normal, least severe | Fix it today |
| SPN 168 FMI 18 | below 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 168 FMI 15 mean?
Battery voltage is a bit high. FMI 15 means: A bit high. A warning, not a shutdown yet.
Can I keep running with SPN 168 FMI 15?
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 168 FMI 15?
Test the alternator output.
How do I clear SPN 168 FMI 15?
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 168 FMI 15?
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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