SPN 1569 FMI 3EGR
EGR Valve Control - Voltage Above Normal
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1569 / FMI 3
Category
EGR
Derate Risk
Yes
Regen Inhibit
No
Inducement Risk
No
Component Location: The EGR valve is typically mounted on the intake side of the engine near the EGR cooler and intake manifold.
Common Symptoms
- Check engine light illuminated with SPN 1569 FMI 3 active
- EGR valve stuck closed or not responding to commanded position
- Reduced engine performance or power loss
- Increased NOx emissions
- Rough idle or unstable engine operation
- Black smoke from exhaust under load
Root Causes
- Short to voltage (B+) in EGR valve control signal wire
- Damaged or chafed wiring harness between ECM and EGR valve actuator
- Failed EGR valve actuator with internal short to voltage
- Corroded or damaged ECM connector pin causing voltage feedback
- Water intrusion into EGR valve connector causing tracking to voltage rail
- Failed ECM output driver circuit
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Derate Behavior
Power Derate
Yes
System Interactions
SPN 1569 FMI 3 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 1569 FMI 3 — 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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