John Deere Fault Code
Free · no signupSPN 157 FMI 18
Power Loss / Engine Stall
Variant 1
System
Fuel System
Symptom
Power Loss / Engine Stall
Diagnosis & fix steps
LOGIC: Fuel Rail Pressure Moderately Low.
ACTION: Change the primary and secondary fuel filters. Inspect the low-pressure fuel supply lines for restrictions or collapsing hoses.
Red Seal field insights
Red Seal Logic: The engine is demanding fuel volume under load, but the common rail pump cannot maintain the targeted pressure.
Variant 2
System
Fuel System
Symptom
Engine Stalling under Load / Power Loss
Diagnosis & fix steps
LOGIC: Fuel Rail Pressure Below Normal (Moderately Severe).
ACTION: Replace primary and secondary fuel filters. Test low-pressure supply pump pressure and flow; inspect suction line for air pull or tank inlet strainer clogging.
Red Seal field insights
FMI 18 indicates the high-pressure pump cannot maintain commanded rail pressure during demand spikes, most frequently caused by suction-side restriction.
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