Cummins
Cummins fault code
SPN 1143 / FMI 18
Cummins Fault Code 627: Low #7 LB Cylinder Power
627 on Cummins engines means: Low #7 LB Cylinder Power. The failure mode (FMI 18) is “data valid but below normal range (moderately severe)”.
Lamp: Yellow
Engine may continue to run, but must be repaired the same day.
Code details
- Manufacturer
- Cummins
- Applies to
- Cummins QS-series electronic engines
- Fault code
- 627
- J1939 SPN
- 1143
- FMI
- 18 — Data valid but below normal range (moderately severe)
- QSK45/60/78 severity level
- QSK60: 2 • QSK78: 2
What to do next
- Read active and inactive codes with the OEM service tool and note the occurrence count.
- FMI 18 tells the shop the type of failure to test for: data valid but below normal range (moderately 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 631 — Low #1 RB Cylinder Power
- Cummins Fault Code 647 — High #7 LB Cylinder Exhaust Temperature
- Cummins Fault Code 651 — High #1 RB Cylinder Exhaust Temperature
- Cummins Fault Code 667 — High #7 LB Cylinder Power
- Cummins Fault Code 677 — Cyl #7 LB Exhaust Temp Sens Failed Low
- Cummins Fault Code 711 — High #1 RB Cylinder Power
- Cummins Fault Code 721 — Cyl #1 RB Exhaust Temp Sens Failed Low
Source: Cummins "Diagnostic Fault Codes For Cummins Engines", publication 80-1044 Rev 5/2013, page 17. Marked in the source as a CENSE fault code. See also OBD-II codes.