SPN 113 FMI 0Network
Lost Communication with Transmission Control Module
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DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 113 / FMI 0
Category
Network
Derate Risk
Possible
Regen Inhibit
No
Inducement Risk
No
Component Location: TCM is typically mounted on or near the transmission body, or in the cab chassis electrical area depending on OEM; connected via J1939 CAN backbone.
Common Symptoms
- Transmission stuck in limp mode or fixed gear
- No gear selection response from shifter
- Transmission warning lamp illuminated on dash
- ABS or stability control faults co-occurring due to shared datalink
- Speedometer or RPM gauge erratic or inoperative
- Engine derate or no-start condition in some configurations
Root Causes
- Loss of battery or ignition power supply to the TCM
- Corroded or loose TCM ground connection
- Faulty or damaged J1939 CAN bus wiring (open, short, or high resistance)
- Defective CAN bus terminating resistor (120 ohm)
- Damaged or corroded TCM connector pins or harness connector
- Failed or damaged TCM module
- J1939 backbone bus short to ground or power
- Defective engine ECM or backbone node preventing CAN communication
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Derate Behavior
Power Derate
Possible
Mileage / Regen Notes
Loss of TCM communication will typically inhibit active DPF regeneration as the aftertreatment controller requires transmission gear and vehicle speed data from the TCM to authorize and safely complete a regen cycle. Parked regen may also be disabled.
System Interactions
SPN 113 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 113 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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