SPN 2098 FMI 0DPF
Diesel Particulate Filter Pressure Sensor B Circuit Low
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 2098 / FMI 0
Category
DPF
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: DPF differential pressure sensor B is typically mounted on the DPF canister or exhaust system, measuring pressure across the filter.
Common Symptoms
- Check engine light illuminated
- DPF regeneration inhibited or fails to complete
- High exhaust back pressure reading displayed
- Derated engine power
- Excessive soot loading message
- Poor engine performance or loss of power
Root Causes
- Faulty DPF differential pressure sensor B Damaged or shorted wiring harness to DPF pressure sensor B Corroded or damaged sensor connector ECM internal fault or software issue Sensor circuit short to ground
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Derate Behavior
Power Derate
No
System Interactions
SPN 2098 FMI 0 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 2098 FMI 0 — 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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