Cummins Fault Code
Free · no signupSPN 5246 FMI 15
Derate (Speed limited to 5 mph)
System
Aftertreatment
Symptom
Derate (Speed limited to 5 mph)
Diagnosis & fix steps
LOGIC: SCR Operator Inducement Severity - Least Severe.
ACTION: Check DEF tank level and quality. Ensure the DEF pump is priming.
Red Seal field insights
Logic: This is the "First Warning." If ignored, it moves to FMI 16.
PRO-TIP: Often triggered by a crystallized dosing nozzle.
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