SPN 183 FMI 0Fuel
Fuel Temperature Sensor A Circuit
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 183 / FMI 0
Category
Fuel
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: Fuel temperature sensor is typically mounted in the fuel supply line near the fuel filter housing or on the cylinder head fuel rail.
Common Symptoms
- Check engine light illuminated
- Engine derate or reduced power
- Hard starting in cold weather
- Rough idle when cold
- Increased white smoke during warm-up
Root Causes
- Faulty fuel temperature sensor Damaged or corroded sensor wiring harness Water or corrosion in fuel temperature sensor connector Failed ECM internal circuit Intermittent open circuit in sensor wiring
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Derate Behavior
Power Derate
No
System Interactions
SPN 183 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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Related Diagnostic Articles
Deep-dive diagnostic page: SPN 183 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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