SPN 151 FMI 0Network
CAN Communication Bus - General Fault
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 151 / FMI 0
Category
Network
Derate Risk
Possible
Regen Inhibit
No
Inducement Risk
No
Component Location: The CAN bus network consists of twisted pair wiring connecting all control modules throughout the vehicle chassis and engine compartment.
Common Symptoms
- Multiple warning lamps illuminated on dash
- Loss of engine power or derate
- Intermittent or complete loss of instrument cluster functions
- Communication errors with diagnostic scan tool
- Transmission shift issues or abnormal operation
Root Causes
- Damaged or corroded CAN bus wiring harness Failed ECM or other control module on the network Poor ground connection at CAN network components Contaminated or damaged CAN bus connector terminals Incorrect terminating resistor configuration
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Derate Behavior
Power Derate
Possible
System Interactions
SPN 151 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 151 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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