Detroit Diesel Fault Code
Free · no signupSPN 5397 FMI 31
Active DPF Light / High Fuel Burn
System
Emissions / DPF
Symptom
Active DPF Light / High Fuel Burn
Diagnosis & fix steps
LOGIC: DPF Regeneration Frequency Too High (Excessive Regens).
ACTION: Perform oil sample test for fuel dilution. Inspect engine for leaking injectors, oil passing turbo seals, or worn valve stem seals.
Red Seal field insights
Root Cause Warning: Frequent regens indicate excessive soot or oil dumping into exhaust rather than a faulty DPF filter.
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