SPN 700 FMI 0Transmission
Transmission Control System Malfunction
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 700 / FMI 0
Category
Transmission
Derate Risk
Yes
Regen Inhibit
No
Inducement Risk
No
Component Location: The transmission control module is typically mounted on the side or rear of the transmission housing.
Common Symptoms
- Check engine light or transmission warning lamp illuminated
- Transmission stuck in one gear or limp mode
- Harsh or erratic shifting
- No shifting or delayed shifts
- Loss of power or reduced performance
- Transmission may default to neutral safety mode
Root Causes
- Faulty transmission control module (TCM) Wiring harness damage or corrosion in transmission CAN circuit Failed transmission solenoid or solenoid pack Low transmission fluid level or contaminated fluid Incompatible ECM/TCM software versions
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Derate Behavior
Power Derate
Yes
System Interactions
SPN 700 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
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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 700 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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