SPN 524287 FMI 31OEM-SpecificMedium
Proprietary Fault — OEM-Specific Condition
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 524287 / FMI 31
Category
OEM-Specific
Fault Type
unknown
FMI Category
protection
Severity
Medium
Derate Risk
Sometimes
Regen Inhibit
No
Inducement Risk
No
Component Location: Varies by OEM and specific fault condition
Common Symptoms
- OEM-specific fault active — symptoms vary by manufacturer
- May appear alongside other active faults
- Requires OEM diagnostic software to interpret
Root Causes
- OEM-specific condition detected by ECM
- Manufacturer-defined protection or monitoring threshold exceeded
- Requires OEM documentation to diagnose
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Derate Behavior
Power Derate
Sometimes
Mileage / Regen Notes
Varies by specific OEM fault condition.
System Interactions
SPN 524287 FMI 31 interacts with the following systems and may trigger cascading faults if not resolved promptly.
TSB Reference: Refer to OEM service documentation for SPN 524287 FMI 31
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.
OEM Notes
Cummins
ISX15: Use INSITE to get full fault description. SPN 524287 is a proprietary SPN range.
Detroit
DD15: DDDL provides full description. Check Detroit service portal for TSBs.
PACCAR
MX-13: DAVIE provides full description. Check PACCAR service portal.
Related Faults in This Category
OEM System Resources
ASE Training Resources
Diagnostic Engine v7.0
Related Diagnostic Articles
Deep-dive diagnostic page: SPN 524287 FMI 31 — 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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