Cummins
Cummins fault code
SPN 632 / FMI 7
Cummins Fault Code 259: Fuel Shutoff Valve - stuck open
259 on Cummins engines means: Fuel Shutoff Valve - stuck open. The failure mode (FMI 7) is “mechanical system not responding or out of adjustment”.
Lamp: Red
Stop engine now – damage imminent.
Code details
- Manufacturer
- Cummins
- Applies to
- Cummins QS-series electronic engines
- Fault code
- 259
- J1939 SPN
- 632
- FMI
- 7 — Mechanical system not responding or out of adjustment
- J1587 PID / SID
- S017
- Engine models
- QSX15, QSK19, QSK23, QST30
- QSK45/60/78 severity level
- QSK45: 2 • QSK60: 2 • QSK78: 2
What to do next
- Treat this as a stop-level fault: shut down safely and get the truck checked before running it further.
- Read active and inactive codes with the OEM service tool and note the occurrence count.
- FMI 7 tells the shop the type of failure to test for: mechanical system not responding or out of adjustment.
- 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.
Owner-OperatorAdd this truck & start trial
Run your own truck?
Log maintenance, track fault codes, and get roadside breakdown dispatch.
$39.99/mo
Cancel anytime
More ways Repairius keeps vehicles running
Tools for owner-operators, shops, fleets and drivers — all in one place.
Auto & Truck Shop OS
From $99.99/mo- Work orders & job management
- Digital vehicle inspections
- Parts lookup & inventory
- Estimates, invoices & payments
Fleet Maintenance
From $129/mo- Preventive maintenance schedules
- Driver DVIRs & defect reports
- Safety & compliance clearance
- Preferred shop dispatch & approvals
My Garage
100% free- Digital glovebox for your vehicles
- Maintenance history & reminders
- Recall alerts
- Book verified local shops
Owner-Operator? Track this truck for $39.99/mo
StartFix these trucks? Get your shop listed free·Find a diesel shop
Related fault codes
- Cummins Fault Code 254 — Fuel Shutoff Valve Circuit - shorted low
- Cummins Fault Code 254 — Fuel Shutoff Valve Circuit - shorted low
- Cummins Fault Code 255 — Fuel Shutoff Valve Circuit - shorted high
- Cummins Fault Code 391 — Fuel Shutoff Valve Supply Voltage error
- PACCAR Fault Code P1652 — Red Warning – Short Circuit to Supply on ECU (D420) Pin (B8)
Source: Cummins "Diagnostic Fault Codes For Cummins Engines", publication 80-1044 Rev 5/2013, page 6. See also OBD-II codes.