Question 1

What does John Deere fault code 1569.31 mean?

Accepted Answer

1569.31 (ECU): Significant power loss; Engine won't rev up; Turtle icon on dash. Fix: Engine Fuel Derate.

LOGIC: This is a "Condition" code, not a sensor fault. The ECU is protecting the engine because of another active fault (usually heat or emissions).

ACTION: 1. Check for other active ECU codes. 
2. Verify coolant and oil temperatures. 
3. Check for fuel restriction.

FIX: Address the primary fault code that triggered the derate.

Question 2

What does John Deere fault code 5246 mean?

Accepted Answer

5246 (ECU): 5 MPH LOCKOUT; Red Stop Lamp; Machine is effectively disabled. Fix: SCR Operator Inducement - Severity 3.

LOGIC: Final stage of emissions enforcement. An SCR fault has been ignored for too long.

ACTION: 1. Identify the root cause (NOx, DEF quality, or Level). 
2. Repair the hardware fault.

FIX: Repair primary SCR fault; perform "Service Recovery Regen" or "Inducement Reset" via Service Advisor software.

Question 3

What does John Deere fault code E1447 / SPN 3610 mean?

Accepted Answer

E1447 / SPN 3610 (Aftertreatment): Active Derate / DPF Light Fix: LOGIC: DPF Inlet Pressure Sensor Voltage Out of Range.

ACTION: Verify pressure sensor hose connections between exhaust pipe and sensor body. Inspect the DPF substrate face for cracking or deep face-plugging.

Question 4

What does John Deere fault code SPN 2659 FMI 18 mean?

Accepted Answer

SPN 2659 FMI 18 (Emissions): Check Engine Light / Light Derate Fix: LOGIC: EGR Mass Flow Rate Below Normal Operating Threshold.

ACTION: Remove EGR valve and scrape out hard carbon crust holding pintle closed. Clean the exhaust gas recirculation delta-pressure sensing venturi pipe tubes.

Question 5

What does John Deere fault code SPN 4364 FMI 18 mean?

Accepted Answer

SPN 4364 FMI 18 (Emissions / SCR): AdBlue Warning Light / Heavy Derate Fix: LOGIC: SCR NOx Conversion Efficiency Low (Downstream Sensor Reading High).

ACTION: Check DEF quality with a refractometer (32.5% spec). Inspect DEF dosing injector for crystallization/clogging. Check for exhaust leaks upstream of NOx sensor.

John Deere Fault Codes

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Code	System	Symptom	Full fix
1569.31	ECU	Significant power loss; Engine won't rev up; Turtle icon on dash.	View fix
5246	ECU	5 MPH LOCKOUT; Red Stop Lamp; Machine is effectively disabled.	View fix
E1447 / SPN 3610	Aftertreatment	Active Derate / DPF Light	View fix
SPN 2659 FMI 18	Emissions	Check Engine Light / Light Derate	View fix
SPN 4364 FMI 18	Emissions / SCR	AdBlue Warning Light / Heavy Derate	View fix