SPN 1173 FMI 2Chassis
Axle 1 Left Wheel Temperature - Erratic/Intermittent
Scan Tool — in guided session
DVOM Testing — in guided session
Connector Pinout — in guided session
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Overview
Fault Code
SPN 1173 / FMI 2
Category
Chassis
Derate Risk
No
Regen Inhibit
No
Inducement Risk
No
Component Location: The axle 1 left wheel temperature sensor is typically mounted on the axle hub assembly near the brake components on the driver side front wheel.
Common Symptoms
- ABS warning lamp illuminated
- Traction control malfunction
- Intermittent wheel temperature readings on scan tool
- Stability control system disabled
- Erratic speedometer operation on affected wheel
Root Causes
- Faulty wheel speed sensor or tone ring damage Damaged or corroded wiring harness to wheel temperature sensor Intermittent connection at sensor connector Failed wheel temperature sensor Water intrusion or corrosion in sensor connector
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Derate Behavior
Power Derate
No
System Interactions
SPN 1173 FMI 2 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 1173 FMI 2 — 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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