What are the symptoms of SPN 3714 FMI 0?

High exhaust temperature lamp illuminated. DPF face plugging indicator active. Frequent or continuous regeneration cycles. Reduced fuel economy. White smoke during regeneration. Check engine light/MIL active. Engine derate or power reduction

What causes SPN 3714 FMI 0?

Excessive unburned fuel entering DPF causing uncontrolled regeneration (thermal event) Faulty or stuck-open injector causing raw fuel in exhaust stream Malfunctioning DPF differential pressure sensor causing incorrect regen initiation Failed or stuck doser injector delivering excess fuel during active regen Clogged or failed EGR system causing elevated exhaust temperatures Defective intermediate temperature sensor providing false high reading Engine running excessively rich due to fueling or air intake issues DPF severely loaded with soot leading to rapid exothermic reaction during regen ACM calibration or software issue commanding excessive fuel dosing

How do I diagnose SPN 3714 FMI 0?

Full step-by-step DVOM tests, electrical procedures, and connector pinout data for SPN 3714 FMI 0 are available inside the AI Diesel Tech guided diagnostic session. The AI walks you through every test — one step at a time.

SPN 3714 FMI 0Aftertreatment

Aftertreatment DPF Intermediate Gas Temperature - Data Valid But Above Normal

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Overview

Fault Code

SPN 3714 / FMI 0

Common Symptoms

High exhaust temperature lamp illuminated
DPF face plugging indicator active
Frequent or continuous regeneration cycles
Reduced fuel economy
White smoke during regeneration
Check engine light/MIL active
Engine derate or power reduction

Root Causes

Excessive unburned fuel entering DPF causing uncontrolled regeneration (thermal event) Faulty or stuck-open injector causing raw fuel in exhaust stream Malfunctioning DPF differential pressure sensor causing incorrect regen initiation Failed or stuck doser injector delivering excess fuel during active regen Clogged or failed EGR system causing elevated exhaust temperatures Defective intermediate temperature sensor providing false high reading Engine running excessively rich due to fueling or air intake issues DPF severely loaded with soot leading to rapid exothermic reaction during regen ACM calibration or software issue commanding excessive fuel dosing

Full step-by-step tests, DVOM guidance, and pinout data are available inside the AI Diesel Tech diagnostic session.

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Derate Behavior

Power Derate

Possible

Mileage / Regen Notes

FMI 0 (above normal) on DPF intermediate temperature will typically inhibit or abort active regeneration immediately to prevent DPF substrate damage; high-temp derate conditions may also be triggered, and manual regen will be blocked until fault is resolved and temperatures return to safe range.

System Interactions

SPN 3714 FMI 0 interacts with the following systems and may trigger cascading faults if not resolved promptly.

DPF differential pressure monitoring — soot load calculations affected

SCR NOx conversion efficiency — DEF dosing strategy may be altered

Active regen inhibit logic — regen may be blocked or delayed

Engine protection derate — ECM may reduce power to protect components

Common Diagnostic Mistakes

Replacing the sensor without verifying wiring continuity and supply voltage first.

Clearing codes without identifying and resolving the root cause — the fault will return.

Ignoring related active faults — cascading faults often share a root cause.

Skipping the connector inspection — corrosion and damaged pins are a leading cause of sensor faults.

Condemning the ECM before exhausting all wiring and component tests.

Replacing the DPF without verifying the regen system is functional — a failed regen injector will reload the new DPF.

Ignoring DEF quality — contaminated DEF causes SCR efficiency faults that look like hardware failures.

Related Faults in This Category

SPN 5246-31SCR NOx Efficiency Low SPN 4364-18DEF Dosing Below Normal SPN 3364-2DEF Quality Erratic SPN 3251-0DPF Differential Pressure High SPN 3719-16DPF Soot Load High

OEM System Resources

Cummins Fault Codes Detroit Diesel Fault Codes PACCAR Fault Codes Volvo Fault Codes Freightliner Fault Codes Mack Fault Codes

ASE Training Resources

Why ASE Certification Matters How ASE Tests Work ASE Study Tips ASE vs AI Diesel Tech Certification Paths Get Started with ASE

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Authority References

Diagnostic procedures on this page are informed by OEM service literature and industry standards.

EPA Aftertreatment & Emissions GuidelinesU.S. EPA heavy-duty diesel aftertreatment compliance, DPF/SCR regulations, and NOx standards.Cummins QuickServe OnlineOfficial Cummins service manuals, fault code lookup, and TSB database.Detroit Diesel DiagnoCentralDetroit Diesel diagnostic procedures, DDDL documentation, and service literature.PACCAR MX Engine ServicePACCAR MX-11 and MX-13 engine service documentation and DAVIE diagnostic guides.Volvo/Mack Tech ToolVolvo and Mack engine fault code reference and PTT/Tech Tool diagnostic procedures.ASE — Diesel Truck Technician CertificationNational Institute for Automotive Service Excellence — T2 Diesel Engines certification standards.

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