Detroit Diesel Fault Code

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SPN 3719 FMI 0

Active DPF Lamp / Torque Derate

System

Emissions / DPF

Symptom

Active DPF Lamp / Torque Derate

Diagnosis & fix steps

LOGIC: DPF Soot Level Very High (Zone 5 / High Soot Load). ACTION: Perform a stationary forced parked regeneration using DiagnosticLink (DDDL) software. Inspect DOC inlet/outlet temp sensors if regen aborts.

Red Seal field insights

Regeneration Threshold: At Zone 5 soot loading, passive regens are blocked by ECM logic; only a forced diagnostic tool regen will clear the latch.

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