John Deere Fault Code
Free · no signupSPN 1569 FMI 31
Fuel Derate.
System
Not specified
Symptom
Fuel Derate.
Diagnosis & fix steps
LOGIC: Engine is in a protection derate due to another active fault.
ACTION: This is a "Follower Code." Look for other active codes (like High Coolant Temp or Low Oil Pressure) and fix those first.
Red Seal field insights
Think of this as a "Muzzle" the computer puts on the engine. You can't clear 1569 until the "Parent Code" is resolved.
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