SPN 2099 FMI 0DPF
Diesel Particulate Filter Pressure Sensor B Circuit High
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 2099 / 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 exhaust system near the DPF assembly to measure pressure difference across the filter.
Common Symptoms
- DPF pressure reading abnormally high or pegged at maximum
- Constant high soot load reading even after successful regen
- Frequent regen requests or extended regen cycles
- Check engine light illuminated
- Reduced engine power or derate condition
- DPF differential pressure shows unrealistic values
Root Causes
- Faulty DPF differential pressure sensor Short to voltage in DPF pressure sensor wiring harness Corroded or damaged sensor connector ECM internal fault affecting sensor circuit Aftermarket wiring harness modification or poor repair
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Derate Behavior
Power Derate
No
System Interactions
SPN 2099 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.
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OEM System Resources
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 2099 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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