Detroit Diesel Fault Code
Free · no signupSPN 5246 FMI 0
Immediate 5 MPH Lockout Derate
System
Emissions
Symptom
Immediate 5 MPH Lockout Derate
Diagnosis & fix steps
LOGIC: Regulatory Aftertreatment SCR Concluding Inducement Active.
ACTION: Connect diagnostic laptop to pull active underlying soot/NOx codes. Perform multiple forced active park regens and verify DEF pump pressure stabilizes at 5 bar (~72.5 PSI).
Red Seal field insights
Inducement Logic: The terminal warning stage triggered after repeated ignored DPF regenerations or severe DEF crystallization blocking exhaust injection.
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