John Deere Fault Code

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SPN 5246 FMI 15

Derate / 60-min Timer

System

Aftertreatment

Symptom

Derate / 60-min Timer

Diagnosis & fix steps

LOGIC: SCR System Induced Derate. ACTION: Check DEF quality (refractometer) and the DEF dosing injector for crystallization.

Red Seal field insights

Logic: The ECM is counting down to a 5mph limit. FIX: Usually poor quality DEF or a clogged "dozer" nozzle.

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