SPN 1413 FMI 18EGR
EGR Valve Position Sensor - Data Valid But Below Normal
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Overview
Fault Code
SPN 1413 / FMI 18
Category
EGR
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: EGR valve position sensor is integrated into or mounted directly on the EGR valve assembly, typically located on the intake side of the engine near the EGR cooler outlet.
Common Symptoms
- Check engine light illuminated
- Engine derate or reduced power
- Poor engine performance or sluggish acceleration
- Increased exhaust smoke
- Rough idle or engine stumbling
- Higher than normal fuel consumption
Root Causes
- EGR valve position sensor signal reading below expected range due to carbon buildup restricting valve movement Faulty or contaminated EGR valve position sensor (3-wire 5V reference type) Poor ground continuity on sensor ground circuit (high resistance ground path) Low or unstable 5V reference voltage supply to EGR position sensor Damaged, chafed, or shorted signal wire between sensor and ECM EGR valve mechanical failure — valve stuck partially closed or seized Connector corrosion or pushed-back terminals at EGR valve position sensor connector EGR cooler restriction causing reduced EGR flow and abnormal valve feedback ECM internal fault affecting sensor input channel (rare)
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Derate Behavior
Power Derate
No
Mileage / Regen Notes
SPN 1413 FMI 18 may inhibit or severely limit active DPF regeneration due to EGR system fault affecting engine air management. Many platforms will derate engine power, disable active regen, and illuminate MIL/CEL. Extended inhibit of regen can lead to DPF over-accumulation and additional soot-load faults.
System Interactions
SPN 1413 FMI 18 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 18 — 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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