SPN 1413 FMI 4EGR
EGR Valve Position Sensor - Voltage Below Normal or Shorted Low
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Overview
Fault Code
SPN 1413 / FMI 4
Category
EGR
Derate Risk
Yes
Regen Inhibit
No
Inducement Risk
No
Component Location: EGR valve is mounted on the intake manifold or EGR cooler outlet on the engine, with the position sensor integrated into the valve body assembly.
Common Symptoms
- Check engine light illuminated
- Engine derate or reduced power
- Rough idle or unstable engine operation
- Increased black smoke from exhaust
- EGR system performance concerns
- Poor throttle response
Root Causes
- EGR valve position sensor signal wire shorted to ground Damaged or corroded EGR valve connector/harness Failed EGR valve position sensor (internal short) Open in sensor 5V reference circuit causing apparent low voltage Water intrusion into EGR valve connector causing corrosion Chafed wiring harness contacting engine block or exhaust components Failed EGR valve assembly requiring complete replacement
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Derate Behavior
Power Derate
Yes
Mileage / Regen Notes
An EGR valve position sensor fault (FMI 4) will typically inhibit or restrict active DPF regeneration cycles as EGR control is compromised. The ECM may place the engine in a reduced power or engine protection mode, preventing regen from initiating to avoid uncontrolled exhaust temperatures.
System Interactions
SPN 1413 FMI 4 interacts with the following systems and may trigger cascading faults if not resolved promptly.
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.
Related Faults in This Category
OEM System Resources
ASE Training Resources
Diagnostic Engine v7.0
Related Diagnostic Articles
Deep-dive diagnostic page: SPN 1413 FMI 4 — Full FSM Sequence & Repair Steps — includes wiring notes, sensor specs, and gated repair procedures.
Authority References
Diagnostic procedures on this page are informed by OEM service literature and industry 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.EPA Aftertreatment & Emissions GuidelinesU.S. EPA heavy-duty diesel aftertreatment compliance, DPF/SCR regulations, and NOx standards.
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