Cummins
Cummins fault code
SPN 168 / FMI 1
Cummins Fault Code 441: Battery #1 Voltage Low - Warning
441 on Cummins engines means: Battery #1 Voltage Low - Warning. The failure mode (FMI 1) is “data valid but below normal operating range (most severe)”.
Lamp: None
Information only – no lamp action.
Code details
- Manufacturer
- Cummins
- Applies to
- Cummins QS-series electronic engines
- Fault code
- 441
- J1939 SPN
- 168
- FMI
- 1 — Data valid but below normal operating range (most severe)
- J1587 PID / SID
- P168
- Engine models
- QSK19, QSK23
- QSK45/60/78 severity level
- QSK45: 3 • QSK60: 3 • QSK78: 3
What to do next
- Read active and inactive codes with the OEM service tool and note the occurrence count.
- FMI 1 tells the shop the type of failure to test for: data valid but below normal operating range (most severe).
- 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
- Cummins Fault Code 441 — Battery #1 Voltage Low - Warning
- Cummins Fault Code 442 — Battery #1 Voltage High - Warning
- Cummins Fault Code 442 — Battery #1 Voltage High – Warning
- International SA 33 SPN 168 FMI 2 — Comm. fault from ESC/BC to PP3.
- International SA 33 SPN 168 FMI 3 — DC Module Overvoltage condition on Vehicle DC Bus.
- International SA 33 SPN 168 FMI 3 — AC Module Overvoltage condition on High Voltage DC Bus.
- International SA 33 SPN 168 FMI 4 — DC Module Undervoltage condition on Vehicle DC Bus.
- International SA 33 SPN 168 FMI 4 — AC Module Undervoltage condition on High Voltage DC Bus.
Source: Cummins "Diagnostic Fault Codes For Cummins Engines", publication 80-1044 Rev 5/2013, page 13. See also OBD-II codes.