What are the symptoms of SPN 3713 FMI 16?

High DPF outlet temperature warning lamp illuminated. Excessive heat from DPF canister. Temperature protection derate active. Frequent active regenerations. DPF face plugging warning. Poor fuel economy during regen cycles. Engine power reduced to protect aftertreatment

What causes SPN 3713 FMI 16?

Excessive exhaust temperatures due to active regeneration running too long or too frequently. Faulty or stuck-open diesel injector causing excessive fuel delivery. Clogged or restricted DPF causing excessive heat buildup during regen. Malfunctioning DPF outlet temperature sensor providing false high reading. Failed or degraded DOC (Diesel Oxidation Catalyst) causing uncontrolled exotherm. Exhaust system air leak upstream allowing excess oxygen to fuel uncontrolled combustion. ACM/ECM software issue causing regen to run beyond normal temperature thresholds. High engine load operating conditions combined with active regen cycle

How do I diagnose SPN 3713 FMI 16?

Full step-by-step DVOM tests, electrical procedures, and connector pinout data for SPN 3713 FMI 16 are available inside the AI Diesel Tech guided diagnostic session. The AI walks you through every test — one step at a time.

SPN 3713 FMI 16Aftertreatment

Aftertreatment DPF Outlet Gas Temperature - Data Valid But Above Normal (Moderately Severe)

Run Full Diagnosis View Related Faults See OEM System Guide

Scan Tool — in guided session

DVOM Testing — in guided session

Connector Pinout — in guided session

DieselVision™ Upload photos — DieselVision™ reads diagrams, connectors, and screens with precision.

Overview

Fault Code

SPN 3713 / FMI 16

Common Symptoms

High DPF outlet temperature warning lamp illuminated
Excessive heat from DPF canister
Temperature protection derate active
Frequent active regenerations
DPF face plugging warning
Poor fuel economy during regen cycles
Engine power reduced to protect aftertreatment

Root Causes

Excessive exhaust temperatures due to active regeneration running too long or too frequently
Faulty or stuck-open diesel injector causing excessive fuel delivery
Clogged or restricted DPF causing excessive heat buildup during regen
Malfunctioning DPF outlet temperature sensor providing false high reading
Failed or degraded DOC (Diesel Oxidation Catalyst) causing uncontrolled exotherm
Exhaust system air leak upstream allowing excess oxygen to fuel uncontrolled combustion
ACM/ECM software issue causing regen to run beyond normal temperature thresholds
High engine load operating conditions combined with active regen cycle

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

AI walks you through every test — one step at a time. Plans start at $12.95/mo.

Start Guided Diagnosis See How It Works

Derate Behavior

Power Derate

Yes

Mileage / Regen Notes

SPN 3713 FMI 16 will typically inhibit or abort active DPF regeneration immediately to prevent thermal damage to the DPF substrate and downstream components. The system may enter a derate condition and require the vehicle to be parked and cooled before regen is re-attempted. Repeated occurrences may lock out regen until fault is diagnosed and cleared.

System Interactions

SPN 3713 FMI 16 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

Diagnostic Engine v7.0

Diagnose SPN 3713 FMI 16 Now Start New Diagnosis

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.

Get weekly diesel diagnostic tips

Real-world fault code walkthroughs, wiring tips, and shop-tested fixes — free.

No spam. Unsubscribe anytime.

Get AI-Guided Diagnosis for SPN 3713 FMI 16

The diagnostic engine walks you through every physical test — step by step, on your phone, at the truck. No guessing. No wasted parts.