Cummins ISB CM850 (2003-06) Fault Code: 1144 PID: SID 5 SPN: 655 FMI: 7 Injector Solenoid Driver Cylinder 5 – Mechanical System Not Responding Properly or Out of Adjustment. Unintended fueling detected in cylinder Number 5.

This fault code can be caused by a failed or damaged injector causing continuous injection. If an injector nozzle is fractured or stuck open, continuous fueling will occur in that cylinder. If this condition occurs, an audible engine knock will be present, and the engine may stall and not start. In addition, low fuel rail pressure and excessive exhaust smoke will be present during cranking conditions. If a failed injector is found to be the cause of this fault code, progressive damage to the combustion chamber may have occurred.

Possible repairs:

1)A stuck open injector nozzle has been detected. Replace the fuel injector.